Journal articles: 'Water Erosion Prediction Project (WEPP) Model'

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Srivastava, Anurag, Joan Q. Wu, William J. Elliot, Erin S. Brooks, and Dennis C. Flanagan. "Modeling Streamflow in a Snow-Dominated Forest Watershed Using the Water Erosion Prediction Project (WEPP) Model." Transactions of the ASABE 60, no. 4 (2017): 1171–87. http://dx.doi.org/10.13031/trans.12035.

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Abstract. The Water Erosion Prediction Project (WEPP) model was originally developed for hillslope and small watershed applications. Recent improvements to WEPP have led to enhanced computations for deep percolation, subsurface lateral flow, and frozen soil. In addition, the incorporation of channel routing has made the WEPP model well suited for large watersheds with perennial flows. However, WEPP is still limited in modeling forested watersheds where groundwater baseflow is substantial. The objectives of this study were to (1) incorporate nonlinear algorithms into WEPP (v2012.8) for estimating groundwater baseflow, (2) auto-calibrate the current and modified WEPP model using a model-independent parameter estimation tool, and (3) evaluate and compare the performance of the current version of WEPP without baseflow (WEPP-Cur) and the modified WEPP model with baseflow (WEPP-Mod) in simulating the hydrology of a snow-dominated watershed in the U.S. Pacific Northwest. A subwatershed of the Upper Cedar River Watershed in western Washington State was chosen for WEPP application and assessment. Simulations were conducted for two periods: 1997-2003 to calibrate the model and 2004-2011 to assess the model performance. The WEPP-Cur simulations resulted in Nash-Sutcliffe efficiency (NSE) and deviation of runoff volume (Dv) values of 0.55 and 24%, respectively, for the calibration period, and 0.60 and 21%, respectively, for the assessment period. The WEPP-Mod simulated streamflow showed improved agreement with observed streamflow, with NSE and Dv values of 0.76 and 6%, respectively, for the calibration period, and 0.74 and 2%, respectively, for the assessment period. The WEPP-Mod model reproduced hydrograph recessions during the low-flow periods and the general trend of the hydrographs, demonstrating its applicability to a watershed where groundwater baseflow was significant. The incorporation of a baseflow component into WEPP will help forest managers to assess the alterations in hydrological processes and water yield for their forest management practices. Keywords: Baseflow, Forest watershed, Hydrological modeling, Streamflow, U.S. Pacific Northwest, WEPP.

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Dennis C. Flanagan, James R. Frankenberger, Thomas A. Cochrane, Chris S. Renschler, and William J. Elliot. "Geospatial Application of the Water Erosion Prediction Project (WEPP) Model." Transactions of the ASABE 56, no. 2 (2013): 591–601. http://dx.doi.org/10.13031/2013.42681.

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Dun, Shuhui, Joan Q. Wu, William J. Elliot, Peter R. Robichaud, Dennis C. Flanagan, James R. Frankenberger, Robert E. Brown, and Arthur C. Xu. "Adapting the Water Erosion Prediction Project (WEPP) model for forest applications." Journal of Hydrology 366, no. 1-4 (March 2009): 46–54. http://dx.doi.org/10.1016/j.jhydrol.2008.12.019.

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Lane, LJ, KG Renard, GR Foster, and JM Laflen. "Development and application of modern soil erosion prediction technology - The USDA experience." Soil Research 30, no. 6 (1992): 893. http://dx.doi.org/10.1071/sr9920893.

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Erosion prediction efforts are described to provide a synopsis of the USDA's experience in developing and applying soil erosion prediction technology in its research and development activities and its soil conservation programs. For almost five decades, equations to predict soil erosion by water have been useful m developing plans for controlling soil erosion and sedimentation. The Universal Soil Low Equation (USLE) is the most widely known and used of the erosion prediction equations. The USLE presents a simply understood and easily applied technology which has been of incalculable benefit to soil conservation and land management. The Chemicals, Runoff, and Erosion from Agricultural Management Systems Model (CREAMS) contains a sophisticated erosion component based, in part, on the USLE and on flow hydraulics and the processes of sediment detachment, transport, and deposition. In 1985, the USDA in cooperation with BLM and several universities initiated a national project called the Water Erosion Prediction Project (WEPP) to develop a next generation water erosion prediction technology. The Revised Universal Soil Loss Equation (RUSLE) is an update of the USLE to improve erosion prediction in the interim before WEPP is adopted and to provide and adjunct technology thereafter.

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Guo, Tian, Anurag Srivastava, and Dennis C. Flanagan. "Improving and calibrating channel erosion simulation in the Water Erosion Prediction Project (WEPP) model." Journal of Environmental Management 291 (August 2021): 112616. http://dx.doi.org/10.1016/j.jenvman.2021.112616.

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Wang, Yi, Wei He, Ting Zhang, Yani Zhang, and Longxi Cao. "Adapting the WEPP Hillslope Model and the TLS Technology to Predict Unpaved Road Soil Erosion." International Journal of Environmental Research and Public Health 19, no. 15 (July 28, 2022): 9213. http://dx.doi.org/10.3390/ijerph19159213.

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Unpaved road erosion have been recognized as important sediment sources in a watershed. To evaluate where and when road erosion occurs, the soil loss along road segments should be precisely predicted with process-based erosion models. Methods: The hillslope version of the Water Erosion Prediction Project (WEPP) was used to estimate soil loss from 20 typical road segments in the red soil region of South China. Terrestrial laser scanning (TLS)-measured soil losses were used to validate the model simulations. The results showed that the WEPP model could reasonably predict the total soil loss in relatively short (less than 100 m) and gentle (slope gradient lower than 10%) road segments. In contrast, soil loss would be underestimated for long or steep road segments. Detailed outputs along roads revealed that most of the peak soil loss rates were underestimated. It might due to the linear critical shear stress theory in the WEPP model. Additionally, the lack of upstream flow was found to be connected to the relatively low model efficiency. Nevertheless, the WEPP simulation could accurately fit erosion trend and predict the peak soil loss positions along road segments. Conclusions: The WEPP model could be adopted to evaluate the erosion risk of unpaved roads in the red soil region of South China.

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Wang, Lili, Dennis C. Flanagan, and Keith A. Cherkauer. "Development of a Coupled Water Quality Model." Transactions of the ASABE 60, no. 4 (2017): 1153–70. http://dx.doi.org/10.13031/trans.12002.

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Abstract. . Nonpoint-source (NPS) pollutants, especially from agriculture, continue to be a primary source of waterquality degradation problems. Effective land management decisions at the field scale must be made to minimize nutrient losses that could pollute streams. Existing NPS models often cannot directly estimate the impacts of different land management practices or determine the effectiveness of combined best management practices (BMPs) in a distributed way at the farm scale. In many cases, they rely on application of the Universal Soil Loss Equation (USLE) or its improved versions, which represent fields in a lumped fashion and use empirical rather than process-based modeling methodologies. In this study, a coupled Water Erosion Prediction Project and Water Quality (WEPP-WQ) model was completed, updated, improved, and evaluated for simulation of hydrology, soil erosion, and water quality. The WEPP model is a well-established process-based model that simulates runoff and erosion processes from a hillslope. The water quality components are based on those of the Soil and Water Assessment Tool (SWAT). A single overland flow element (OFE) on a hillslope is used to represent a single soil and land use management. The WEPP-WQ model was tested by comparing simulated values from the coupled model with observed nutrient and sediment concentrations in surface runoff following storm events at experimental sites near Waterloo in northeastern Indiana and at the Throckmorton Purdue Agricultural Center in west central Indiana. Time series evaluation of the WEPP-WQ model was performed with observed nutrient and sediment losses from an experimental plot near Tifton, Georgia. The model performed quite well in simulating nutrient losses for single storm events, with R2 greater than 0.8, Nash-Sutcliffe efficiency (NSE) greater than 0.65, and percent bias (PBIAS) less than 31% for runoff, sediment, nitrate nitrogen, total nitrogen, soluble phosphorus, and total phosphorus losses. In predicting time series nutrient loss, the WEPP-WQ model simulated daily nitrate nitrogen losses adequately, with the ratio of the root mean square error to the standard deviation of measured data (RSR) less than 0.7, NSE greater than 0.55, and PBIAS within the range of ±40%. Comparisons between simulated soluble phosphorus, total phosphorus, and literature results were performed due to the absence of an available observational dataset. The WEPP-WQ model with a single OFE in this study provides a basic but important step for the development of WEPP-WQ models with multiple OFEs that can evaluate the effectiveness of BMPs Keywords: Modeling, Nitrogen, Phosphorus, Soil erosion, Water quality, WEPP.

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S. Dun, J. Q. Wu, D. K. McCool, J. R. Frankenberger, and D. C. Flanagan. "Improving Frost-Simulation Subroutines of the Water Erosion Prediction Project (WEPP) Model." Transactions of the ASABE 53, no. 5 (2010): 1399–411. http://dx.doi.org/10.13031/2013.34896.

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D. C. Flanagan, J. E. Gilley, and T. G. Franti. "Water Erosion Prediction Project (WEPP): Development History, Model Capabilities, and Future Enhancements." Transactions of the ASABE 50, no. 5 (2007): 1603–12. http://dx.doi.org/10.13031/2013.23968.

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Grace III, Johnny McFero. "Predicting Forest Road Surface Erosion and Storm Runoff from High-Elevation Sites." Transactions of the ASABE 60, no. 3 (2017): 705–19. http://dx.doi.org/10.13031/trans.11646.

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Abstract. Forest roads are a concern in management because they represent areas of elevated risks associated with soil erosion and storm runoff connectivity to stream systems. Storm runoff emanating from forest roads and their connectivity to downslope resources can be influenced by a myriad of factors, including storm characteristics, management practices, and the interaction of management practices and successive storm events. Mitigating sediment export and ensuring that storm runoff has negligible impacts on downstream resources requires a more complete understanding of forest road erosion and sediment delivery dynamics. Progress in the area of road and stream connectivity issues hinges on reliable prediction tools to inform broader-scale modeling of watershed-scale effects of forest roads and management practices. In this study, the Water Erosion Prediction Project (WEPP) model was evaluated based on the results from 156 runoff-generating storm events during a continuous five-year study of nine high-elevation road sections in the Appalachian Mountains. The model adequately predicted sediment yield from the road sections with an overall Nash-Sutcliffe model efficiency (E) of 0.76, Willmott refined index of agreement (dr) of 0.56, percent error of 5%, and average storm difference (ASD) of 1.2 kg. In contrast, WEPP predictions of storm runoff were not as good, and the poor agreement was attributed to an inability to determine the source area for runoff from some of the larger runoff events. In general, the WEPP model for these high-elevation sites adequately described the sediment yield for the road sections. Keywords: Forest roads, Long-term simulation, Runoff, Sediment, Water Erosion Modeling, WEPP.

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Cole-Crosby, Iris, Patrick Igbokwe, Jesse Harness, and Lois Ascough. "SWEET POTATO AS A CROP FOR SOIL CONSERVATION." HortScience 27, no. 11 (November 1992): 1170h—1170. http://dx.doi.org/10.21273/hortsci.27.11.1170h.

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Most of the research on soil erosion has been done on traditional crops such as cotton, field corn and soybean and not vegetables. The USDA-ARS United States Department of Agriculture-Agricultural Research Service had developed a process based erosion prediction program called Water Erosion Prediction Project (WEPP). Alcorn is providing data for the validation of this model for selected fruits and vegetables. WEPP was run for sweet potatoe and cotton using a 10 year simulation. Some input parameters were row width tillage sequences and depths, rainfall, temperature canopy width, canopy cover, vegetative dry matter and leaf area index. The results from WEPP is given as soil loss for 50M at increments of .5M. There was a significant difference in the amount of soil lost from sweet potato when grown as a single crop as compared with cotton.

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Al-Hamdan, Osama Zuhair, Fred B. Pierson, Peter Robichaud, William J. Elliot, and Christopher Jason Williams. "New Erodibility Parameterization for Applying WEPP on Rangelands Using ERMiT." Journal of the ASABE 65, no. 2 (2022): 251–64. http://dx.doi.org/10.13031/ja.14564.

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HighlightsA practical parameterization approach to estimate erodibility was developed for WEPP applications on rangelands.Soil texture had a greater effect on rill erodibility than vegetation cover.Vegetation cover had a greater effect on interrill erodibility than soil texture.A new set of erodibility input parameters was defined for ERMiT applications on rangelands.Abstract. The USDA Water Erosion Prediction Project (WEPP) is a process-based soil erosion prediction model. WEPP uses three soil erodibility parameters: rill erodibility (Kr), interrill erodibility (Ki), and critical hydraulic shear stress (tc). In this study, a new parameterization approach for estimating erodibility was developed for WEPP applications on rangelands. Data from overland flow experiments on disturbed and undisturbed rangelands were used to develop empirical equations to predict rill erodibility variation as a function of vegetation cover and soil texture. Data from rainfall simulation experiments were analyzed by piecewise regression to develop empirical equations for predicting the variability of interrill erodibility before and after disturbance and across a wide range of soil textures as a function of vegetation cover and soil texture. Critical shear values corresponding to the developed rill and interrill erodibility parameters were proposed. Our results show that the new erodibility approach predicts erosion at the plot scale with a satisfactory range of error (PBIAS =35.6 and Nash-Sutcliffe efficiency = 0.49). The new approach was used to provide soil erodibility values for the Erosion Risk Management Tool (ERMiT), which uses WEPP as the runoff and erosion calculation engine. Keywords: ERMiT, Erosion, Interrill, Rangeland management, Rill, Shrub, Soil burn severity, WEPP.

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Yu, B., and C. J. Rosewell. "Evaluation of WEPP for runoff and soil loss prediction at Gunnedah, NSW, Australia." Soil Research 39, no. 5 (2001): 1131. http://dx.doi.org/10.1071/sr00091.

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It is important to use historical data to test physically based runoff and soil erosion prediction models as well as the method to estimate model parameters. WEPP (Water Erosion Prediction Project) was validated for bare fallow and annual wheat treatments at Gunnedah, New South Wales, Australia. Wheat stubble was either burned or mulched. Climate, soil, management, and runoff and soil loss data were collected for the period 1980–87 for 3 bare fallow plots, and 1950–74 for 10 annual wheat plots. Three slope lengths from 21 to 62 m were established for the treatment with stubble burned. Slope steepness varied from 8% to 9% at the site. Effective saturated hydraulic conductivity and soil erodibility parameters were estimated from measured soil properties. No further calibration of these parameters was attempted in order to assess the true potential of the model for runoff and soil loss predictions. WEPP worked well for the bare fallow plots with prediction efficiency of 0.97 for event runoff and soil losses. WEPP generally over-predicted the runoff, and consequently, the soil loss for annual wheat treatments for the site. WEPP was able to predict the effect of slope length on sediment concentration and soil loss for the site. CLIGEN, which provides the continuous climate input to WEPP, was found to produce adequately the mean daily rainfall, but produced higher than expected peak rainfall intensity, resulting in higher runoff and soil loss for all treatments.

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Rybicki, Roman. "Evaluation of the effects of land consolidation in the Latyczyn village in terms of land protection against erosion on the slope scale." Journal of Water and Land Development 35, no. 1 (December 1, 2017): 203–9. http://dx.doi.org/10.1515/jwld-2017-0085.

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AbstractSoil erosion by water is an important economical issue strongly deteriorating environment and requiring remedial actions. The study was designed to evaluate antierosion effect of changes in the layout of plots from along to across slope as an effect of land consolidation. Moreover, rightness of leaving newly set out boundaries of plots without any protection (i.e. sodding) was evaluated. For this purpose simulations of use of additional anti-erosive measures were done. The Water Erosion Prediction Project (WEPP) model was used. Studies have shown that in addition to the design of transverse layout of parcels during consolidation, further antierosion measures may be necessary to reduce soil loss and sediment yield. In order to minimize soil losses outside the slope, boundaries between the newly designed fields should be sodded already in the post consolidation management. Limitation the amount of erosion over the entire slope requires use of additional protection measures in the upper part of slopes e.g. shelterbelts and antierosion crop rotations. WEPP model can be recommended for Provincial Bureaus of Surveying as a tool to support the development of assumptions for consolidation projects of lands threatened by erosion.

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Mohammed, Safwan, Issa Kbibo, Omran Alshihabi, and Elien Mahfoud. "Studying rainfall changes and water erosion of soil by using the WEPP model in Lattakia, Syria." Journal of Agricultural Sciences, Belgrade 61, no. 4 (2016): 375–86. http://dx.doi.org/10.2298/jas1604375m.

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Changes of soil erosion and rainfall have been simulated by using the Water Erosion Prediction Project (WEPP) model between 2016 and 2039 in Lattakia, Syria. This study was conducted in 6 locations that are characterized by two different ecosystems (agricultural, forest). The results show a linear decrease in rainfall amount of about 7.11 mm per year (170 mm for the whole studying period). For the years 2025, 2026 and 2030, three snowy storm events have been predicted, while the year 2030 will record the highest rainfall amount of 1816.1 mm. According to the WEPP model, the average of estimated soil erosion amount in Alhamara has reached 19 t/ha/y for the agricultural system while it is estimated to be 2.03 t/ha/y for the forest system. The general average of soil erosion in the study area (taking into consideration the variety of slope) within the agricultural system has reached 14.086 t/ha/y, which indicates that there will be a dangerous impact of future erosion on the sustainability of natural sources (soil, water) in the study area.

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PISCOYA, VICTOR CASIMIRO, WALDEMIR PEREIRA DE SOUZA, JOSÉ RAMON BARROS CANTALICE, MOACYR CUNHA FILHO, ROBSON CARLOS PEREIRA DE MELO, and RENISSON NEPONUCENO DE ARAÚJO FILHO. "WEPP MODEL FOR RILL EROSION ESTIMATION IN A BRAZILIAN SEMIARID WATERSHED." Revista Caatinga 33, no. 3 (September 2020): 835–43. http://dx.doi.org/10.1590/1983-21252020v33n327rc.

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ABSTRACT Soil erosion is a major environmental problem in many parts of the world and represents a serious problem for sustainable agriculture and the environment, with direct and indirect impacts on soil quality and fertility. This study aimed to use the Water Erosion Prediction Project (WEPP) model to estimate rill erosion and determine soil physical and hydraulic properties, which are essential to investigate its performance. To this end, an experiment was carried out in the Exu Creek watershed, in Serra Talhada, semi -arid region of Pernambuco State (Brazil), under increasing flow rates: T1: 5.87 L min-1; T2: 12.10 L min-1; T3: 20.33 L min1; and T4: 27.57 L min-1. Liquid and solid discharges were sampled for determination and characterization of hydraulic parameters in preformed rill flows. Reynolds numbers between 2,019 and 6,929 and Froude numbers below 1 found in this study attest to occurrence of erosive rills. Soil losses due to rill erosion increased as flow rates increased. Rill erodibility was 0.0011 kg N-1 s-1, and critical shear stress (tc) was 1.91 Pa, collapsing rill sidewalls and increasing local uplift, wet perimeter, and rill hydraulic radius.

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Cole-Crosby, Iris, Liang Huam, Jesse Harness, Patrick Igbokwe, Suresh Tiwari, and Om P. Vadhwa. "PLANT GROWTH AND RESIDUE DECOMPOSITION COMPONENT OF WEPP - WATER EROSION PREDICTION PROJECT FOR FRUIT AND VEGETABLES." HortScience 26, no. 5 (May 1991): 497a—497. http://dx.doi.org/10.21273/hortsci.26.5.497a.

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Plant growth and residue decomposition values are needed by the Soil Conservation Service for developing data bases for selected fruit and vegetable crops. These data bases will be used for predicting soil loss using improved erosion prediction technology. The plant growth parameters under investigation are canopy cover leaf area index, plant height plant weight, root weight, stem diameter and vegetative dry matter. The climatic parameter are daily base temperature rainfall and growing degree days. The following is a list of the residue decomposition parameter: 1. Residue weight and harvest 2. Initial carbon-nitrogen ratio, and 3. Percent residue cover at harvest. The results are being used in the WEPP model to predict soil erosion. Data collection afor these parameters start 15 days after planting for vegetables and continue at 7 day intervals through maturity.

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Oshunsanya, Suarau Odutola, and Nkem Joseph Nwosu. "Suitability of Universal Soil Loss Erodibility, Inter-rill and Rill Erodibility Models for Selected Tropical Soils." Agricultura Tropica et Subtropica 50, no. 4 (December 1, 2017): 191–98. http://dx.doi.org/10.1515/ats-2017-0020.

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AbstractThe universal soil loss equation (USLE) and water erosion prediction project (WEPP) (inter-rill and rill) erodibility factors are important indicators for land degradation assessment all over the world, which were primarily developed for the United States of America (USA). However, information on suitability of USLE and WEPP for tropical environment is scarce. Therefore, studies were carried out to investigate the suitability of USLE and WEPP for selected tropical soils of Southwestern Nigeria. Four pedons classified based on USDA soil taxonomy as Plinthic Petraquept (Adio series), Kanhaplic Haplaustalf (Oyo series), Typic Plinthustalf (Temidire series) and Typic Haplaustalf (Owutu series) were used for the study. Soil erodibility factor was determined using USLE and WEPP models. Origin-Pro. 8.1 software was employed to compare USLE and WEPP models for conformity and suitability. The results showed perfect agreement (R2= 1.0;P< 0.001) between the two WEPP (inter-rill and rill) erodibility models in all the four soil types investigated. In addition, WEPP models (inter-rill and rill erodibility) significantly (R2= 0.82;P< 0.001) related to USLE (El-Swaify and Dangler, 1977) erodibility model. There was a poor relationship (R2= 0.46;P< 0.06) between USLE (Wischmeier and Mannering, 1968) and the WEPP erodibility factors. The WEPP erodibility models with a perfect relationship with soil properties of the four soil types are more suitable than USLE models for predicting soil erodibility of the identified soil types in tropical environments.

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Konz, N., D. Bänninger, M. Nearing, and C. Alewell. "Does WEPP meet the specificity of soil erosion in steep mountain regions?" Hydrology and Earth System Sciences Discussions 6, no. 2 (March 9, 2009): 2153–88. http://dx.doi.org/10.5194/hessd-6-2153-2009.

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Abstract. We chose the WEPP model (Water Erosion Prediction Project) to describe soil erosion in the Urseren Valley (central Switzerland) as it seems to be one of the most promising models for steep mountain environments. Crucial model parameters were determined in the field (slope, plant species, fractional vegetation cover, initial saturation level), by laboratory analyses (grain size, organic matter) or by the WEPP manual (rill- and interrill erodibility, effective hydraulic conductivity, cation exchange capacity). The quantification of soil erosion was performed on hill slope scale for three different land use types: meadows, pastures with dwarf shrubs and pastures without dwarf shrubs. Erosion rates for the vegetation period were measured with sediment traps between June 2006 and November 2007. Long-term soil erosion rates were estimated by measuring Cs-137 redistribution, deposited after the Chernobyl accident. In addition to the erosion rates, soil moisture and surface flow was additionally measured during the vegetation period in the field and compared to model output. Short-term erosion rates are simulated well whereas long term erosion rates were underestimated by the model. Simulated soil moisture has a parallel development compared to measured data from April onwards but a converse dynamic in early spring (simulated increase and measured decrease in March and April). The discrepancy in soil water during springtime was explained by delayed simulated snow cover melting. The underestimation of simulated long term erosion rates is attributed to alpine processes other than overland flow and splash. Snow gliding processes might dominate erosion processes during winter time. We assume that these differences lead to the general simulated underestimation of erosion rates. Thus, forcing erosion processes which dominate erosion rates in mountainous regions have to be implemented to WEPP for a successful application in the future.

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Foltz, Randy B., and William J. Elliot. "Effect of Lowered Tire Pressures on Road Erosion." Transportation Research Record: Journal of the Transportation Research Board 1589, no. 1 (January 1997): 19–25. http://dx.doi.org/10.3141/1589-03.

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The effect of tire pressure on sediment produced by loaded logging trucks operating on low-quality aggregate surfaced roads is analyzed. Rainfall and runoff were measured for three winter seasons with logging truck traffic. Sediment eroded from the road surface from moderately reduced tire pressure road sections averaged 45 percent less than from the highway tire pressure sections. An average reduction of 80 percent was measured from the section used by trucks operating with low tire pressure sections. Because the processes responsible for sediment reduction are not site specific, lowering tire pressures in logging trucks on unpaved roads can reduce the sediment loss from many unpaved road surfaces. The results were used to calibrate the Water Erosion Prediction Project (WEPP) model. Once calibrated, the model estimated the sediment reduction expected at representative locations for all national forests. The WEPP model demonstrated its ability to be helpful in estimating the sediment reduction from forest roads.

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Jorge, Gabriella, Mario Pérez Bidegain, Jose Terra, and Jorge Sawchik. "Ajuste del modelo de erosión WEPP para un Argisol Subéutrico y un Brunosol Éutrico en el Uruguay." Agrociencia 19, no. 1 (June 2015): 84–93. http://dx.doi.org/10.31285/agro.19.324.

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Los modelos de estimación de erosión son herramientas útiles para la planificación de sistemas productivos sustentables. El modelo Water Erosion Prediction Project (WEPP) estima erosión laminar y en canalículos, así como la carga y deposición del sedimento, con distribución temporal y espacial. Esto permite estimar no sólo los efectos in situ sino también los efectos fuera del sitio, como ser deposición en cauces de agua, pudiéndose aplicar en estudios ambientales. Si bien este modelo está basado en los procesos físicos que ocurren en el suelo, es preciso realizar ajustes sitio-específicos. El objetivo de este estudio fue ajustar el modelo WEPP, para suelos representativos de la zona agrícola litoral oeste y lomadas del este del Uruguay. Se utilizaron datos de parcelas experimentales de escurrimiento de INIA La Estanzuela y Palo a Pique, y se compararon los valores de erosión estimados por WEPP y USLE/RUSLE con los medidos en términos de promedios anuales. Además se contrastó la erosión estimada con WEPP con la medida a escala anual. WEPP estimó la erosión de ambos sitios con alto nivel de precisión, comparable al de USLE (R2=0,97 y 0,98 respectivamente). El índice Nash-Sutcliffe de 0,92 indica que su desempeño es muy bueno. Para continuar esta línea de investigación resulta necesario realizar medidas de variables físicas del suelo o desarrollar ecuaciones de pedotransferencia alternativas.

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Cole-Crosby, Iris, Jesse Harness, and Patrick Igbokwe. "MANAGEMENT AND CULTURAL PRACTICES OF IRISH POTATO AND SWEET POTATO AND THEIR EFFECT ON SOIL LOSS." HortScience 27, no. 6 (June 1992): 587d—587. http://dx.doi.org/10.21273/hortsci.27.6.587d.

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The cultural and management practices for Irish Potato and Sweet Potato were monitored, along with various plant growth parameters. Data was collected on row width, plant spacing, irrigation, root mass, plant population, vegetative dry matter, canopy height, yeild, above ground biomass, root depth, canopy cover, leaf area index, and stem diameter. Climatic parameters such as rainfall, average daily temperatures, and growing degree days. The data was imputed into the erosion prediction model WEPP (Water Erosion Prediction Project) and the annual soil loss was compared between the crops. Results suggest that Irish Potato is better crop for conserving soil.

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Wilson, C. G., A. N. T. Papanicolaou, and O. Abaci. "SOM dynamics and erosion in an agricultural test field of the Clear Creek, IA watershed." Hydrology and Earth System Sciences Discussions 6, no. 2 (March 4, 2009): 1581–619. http://dx.doi.org/10.5194/hessd-6-1581-2009.

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Abstract. To date, few studies have examined in detail the role of spatial variabilities of erosion on Soil Organic Matter (SOM). More specifically, the role of deposition is still poorly understood. The nature of the research is novel because it combines dynamic model simulations using the Water Erosion Prediction Project (WEPP) and CENTURY SOM dynamics model to evaluate soil and SOM loss in an agricultural test field of the Clear Creek, IA watershed. In addition, numerical simulations were coupled with limited field investigations calibrating and verifying WEPP and CENTURY. The main task of this study was to evaluate changes in SOM dynamics in a field using CENTURY and accounting for the interdependence of historical and current management practices, erosion (i.e., soil loss and deposition), and decomposition. Simulations were conducted under three different erosion scenarios determined using WEPP to demonstrate the importance of including deposition in studies of SOM dynamics: (1) assuming no erosion, (2) using an average erosion rate for the whole field, and (3) dividing the field into an erosional upland and depositional floodplain. The total SOM concentrations produced by the segmented field simulation agreed best with the measured field values. Simulated SOM concentrations values for the upland were 13% lower and values for the floodplain were 16% higher than measured field values. The results of this investigation compare well with the simulation results of other studies in terms of the effects of deposition on SOM distributions and that more detailed erosion values lead to better performance of the model. Deposition decreased SOM loss from the field by accounting for sequestration of carbon.

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Yu, B., C. A. A. Ciesiolka, C. W. Rose, and K. J. Coughlan. "A validation test of WEPP to predict runoff and soil loss from a pineapple farm on a sandy soil in subtropical Queensland, Australia." Soil Research 38, no. 3 (2000): 537. http://dx.doi.org/10.1071/sr99104.

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Monthly runoff and soil loss simulated by WEPP (Water Erosion Prediction Project) were compared with field observations on a pineapple farm in south-east Queensland for a 3-year period. The soil at the site is sandy. Slope length and steepness are 36m and 5.5%, respectively. Three treatments, namely bare, farmers’ conventional practice, and mulching of the furrows, were used. Infiltration and erodibility parameters were determined using WEPP-recommended equations and measurable soil properties. These parameters were also calibrated using the runoff and soil loss data for the bare plot only. Apart from the soil loss prediction for the mulching treatment, for which WEPP did not perform well, the average coefficient of efficiency in runoff and soil loss predictions was –0.02 using soil property-based parameter values and 0.66 using calibrated parameter values. The corresponding r 2 values are 0.57 and 0.81, respectively. On the whole, WEPP is able to reproduce the trend and variations in runoff and soil loss among different treatments for the site. Parameter values based on measurable soil properties would greatly under-estimate the runoff and soil loss for the site. Thus, use of WEPP outside its US database requires calibration with locally obtained data. It was also found that WEPP does not seem to model effectively the situation where there is considerable flow impediment with the furrows covered with mulch. We are unable to reject WEPP because the statistical performance indicators are reasonable for the site, and because the model is so complex that it is nearly impossible to pinpoint the source of discrepancy and articulate the model deficiency on physical grounds.

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Konz, N., D. Baenninger, M. Konz, M. Nearing, and C. Alewell. "Process identification of soil erosion in steep mountain regions." Hydrology and Earth System Sciences 14, no. 4 (April 15, 2010): 675–86. http://dx.doi.org/10.5194/hess-14-675-2010.

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Abstract. Mountainous soil erosion processes were investigated in the Urseren Valley (Central Switzerland) by means of measurements and simulations. The quantification of soil erosion was performed on hill slope scale (2·20 m) for three different land use types: hayfields, pastures with dwarf shrubs and pastures without dwarf shrubs with three replicates each. Erosion rates during growing season were measured with sediment traps between June 2006 and November 2007. Long-term soil erosion rates were estimated based on Cs- 137 redistribution. In addition, soil moisture and surface flow were recorded during the growing season in the field and compared to model output. We chose the WEPP model (Water Erosion Prediction Project) to simulate soil erosion during the growing season. Model parameters were determined in the field (slope, plant species, fractional vegetation cover, initial saturation level), by laboratory analyses (grain size, organic matter) and by literature study. The WEPP model simulates sheet erosion processes (interrill and splash erosion processes, please note that no rill erosion occurs at our sites). Model output resulted in considerable smaller values than the measured erosion rates with sediment traps for the same period. We attribute the differences to observed random gravity driven erosion of soil conglomerates. The Cs-137 measurements deliver substantially higher mean annual erosion rates, which are most likely connected to snow cover related processes such as snow gliding and avalanche activities.

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Robichaud, Peter R., William J. Elliot, Sarah A. Lewis, and Mary Ellen Miller. "Validation of a probabilistic post-fire erosion model." International Journal of Wildland Fire 25, no. 3 (2016): 337. http://dx.doi.org/10.1071/wf14171.

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Post-fire increases of runoff and erosion often occur and land managers need tools to be able to project the increased risk. The Erosion Risk Management Tool (ERMiT) uses the Water Erosion Prediction Project (WEPP) model as the underlying processor. ERMiT predicts the probability of a given amount of hillslope sediment delivery from a single rainfall or snowmelt event on unburned, burned and recovering forest, range and chaparral hillslopes and the effectiveness of selected mitigation treatments. Eight published field study sites were used to compare ERMiT predictions with observed sediment deliveries. Most sites experienced only a few rainfall events that produced runoff and sediment (1.3–9.2%) except for a California site with a Mediterranean climate (45.6%). When sediment delivery occurred, pooled Spearman rank correlations indicated significant correlations between the observed sediment delivery and those predicted by ERMiT. Correlations were ρ = 0.65 for the controls, ρ = 0.59 for the log erosion barriers and ρ = 0.27 (not significant) for the mulch treatments. Half of the individual sites also had significant correlations, as did 6 of 7 compared post-fire years. These model validation results suggest reasonable estimates of probabilistic post-fire hillslope sediment delivery when compared with observations from eight field sites.

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Guo, Tian, Anurag Srivastava, Dennis C. Flanagan, Yaoze Liu, Bernard A. Engel, and Madeline M. McIntosh. "Evaluation of Costs and Efficiencies of Urban Low Impact Development (LID) Practices on Stormwater Runoff and Soil Erosion in an Urban Watershed Using the Water Erosion Prediction Project (WEPP) Model." Water 13, no. 15 (July 30, 2021): 2076. http://dx.doi.org/10.3390/w13152076.

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Storm events and soil erosion can adversely impact flood control, soil conservation, water quality, the recreation economy, and ecosystem biodiversity in urban systems. Urban Low Impact Development practices (LIDs) can manage stormwater runoff, control soil losses, and improve water quality. The Water Erosion Prediction Project (WEPP) model has been widely applied to assess the responses of hydrology and soil losses to conservation practices in agricultural and forested areas. This research study is the first to calibrate the WEPP model to simulate streamflow discharge in the Brentwood watershed in Austin, Texas and apply the calibrated WEPP model to assess the impacts of LIDs. The costs and impacts of various LID scenarios on annual water balance, and monthly average, and daily runoff volumes, and sediment losses at hillslopes and at the watershed outlet were quantified and compared. The LID scenarios identified that native planting in Critically Eroding Areas (CEAs), native planting in all suitable areas, native planting in CEAs with detention ponds, and native planting in all suitable areas with detention ponds could reduce the predicted average annual stormwater runoff by 20–24% and sediment losses by 86–94% at the watershed outlet, and reduce the average annual soil loss rates on hillslope profiles in sub-watersheds by 86–87% with the lowest costs (USD 2991/yr–USD 5257/yr). Watershed/field characteristics, locations, areas, costs, and the effectiveness of the LID practices were essential in choosing the LID scenarios. These research results can help guide decision-making on the selection and implementation of the most economical and suitable LID practices to strengthen the climate resilience and environmental sustainability of urban systems.

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Brooks, Erin S., Mariana Dobre, William J. Elliot, Joan Q. Wu, and Jan Boll. "Watershed-scale evaluation of the Water Erosion Prediction Project (WEPP) model in the Lake Tahoe basin." Journal of Hydrology 533 (February 2016): 389–402. http://dx.doi.org/10.1016/j.jhydrol.2015.12.004.

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Revuelta-Acosta, J. D., D. C. Flanagan, B. A. Engel, and K. W. King. "Improvement of the Water Erosion Prediction Project (WEPP) model for quantifying field scale subsurface drainage discharge." Agricultural Water Management 244 (February 2021): 106597. http://dx.doi.org/10.1016/j.agwat.2020.106597.

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Miller, Mary Ellen, Lee H. MacDonald, Peter R. Robichaud, and William J. Elliot. "Predicting post-fire hillslope erosion in forest lands of the western United States." International Journal of Wildland Fire 20, no. 8 (2011): 982. http://dx.doi.org/10.1071/wf09142.

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Many forests and their associated water resources are at increasing risk from large and severe wildfires due to high fuel accumulations and climate change. Extensive fuel treatments are being proposed, but it is not clear where such treatments should be focussed. The goals of this project were to: (1) predict potential post-fire erosion rates for forests and shrublands in the western United States to help prioritise fuel treatments; and (2) assess model sensitivity and accuracy. Post-fire ground cover was predicted using historical fire weather data and the First Order Fire Effects Model. Parameter files from the Disturbed Water Erosion Prediction Project (WEPP) were combined with GeoWEPP to predict post-fire erosion at the hillslope scale. Predicted median annual erosion rates were 0.1–2 Mg ha–1 year–1 for most of the intermountain west, ~10–40 Mg ha–1 year–1 for wetter areas along the Pacific Coast and up to 100 Mg ha–1 year–1 for north-western California. Sensitivity analyses showed the predicted erosion rates were predominantly controlled by the amount of precipitation rather than surface cover. The limited validation dataset showed a reasonable correlation between predicted and measured erosion rates (R2 = 0.61), although predictions were much less than measured values. Our results demonstrate the feasibility of predicting post-fire erosion rates on a large scale. The validation and sensitivity analysis indicated that the predictions are most useful for prioritising fuel reduction treatments on a local rather than interregional scale, and they also helped identify model improvements and research needs.

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Hayhoe, H. N., R. G. Pelletier, and L. J. P. van Vliet. "Estimation of snowmelt runoff in the Peace River region using a soil moisture budget." Canadian Journal of Soil Science 73, no. 4 (November 1, 1993): 489–501. http://dx.doi.org/10.4141/cjss93-050.

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Rainfall and snowmelt runoff on soil frozen below the surface are recognized as important factors contributing to soil loss in Canada. The risk of rain on frozen soil has been quantified, and the amount of snowmelt on frozen soil has been estimated. This study extends such research to derive a climate-based model to estimate winter and spring runoff. This could result in a more accurate erosion prediction for areas where snowmelt is a major source for runoff. Selected components of the Water Erosion Prediction Project (WEPP) model and the versatile soil moisture budget (VB) were tested on observed data for two study sites in the Peace River region. The version of the WEPP model available to us estimated snow depth, soil frost depth and frequency of freeze–thaw cycles. However, the results did not adequately match observed data. The VB was modified in this study to improve the estimate of potential winter and spring runoff, and it was shown that incorporating observations of snow depth improved the estimate of the time and amount of snowmelt runoff. The modified runoff model was validated with data collected in the Peace River area of northern Alberta and British Columbia and with published data from the Prairies. Key words: Snowmelt, runoff, soil moisture budget

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Pieri, Linda, Marco Bittelli, Joan Q. Wu, Shuhui Dun, Dennis C. Flanagan, Paola Rossi Pisa, Francesca Ventura, and Fiorenzo Salvatorelli. "Using the Water Erosion Prediction Project (WEPP) model to simulate field-observed runoff and erosion in the Apennines mountain range, Italy." Journal of Hydrology 336, no. 1-2 (March 2007): 84–97. http://dx.doi.org/10.1016/j.jhydrol.2006.12.014.

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Kinnell, PIA. "Interrill erodibilities based on the rainfall intensity flow discharge erosivity factor." Soil Research 31, no. 3 (1993): 319. http://dx.doi.org/10.1071/sr9930319.

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Interrill erodibilities are often determined using a model which considers the interrill erosion rate to vary directly with rainfall intensity (I) squared. However, it has been shown that the sediment discharge from an interrill area varies directly with I rather than I2 when factors such as flow discharge are also considered. Analysis of data from the experiments used to determine interrill erodibilities in the Water Erosion Prediction Project (WEPP) in terms of a model that uses both rainfall rate and flow discharge indicates that the susceptibilities of some soils to interrill erosion may differ considerably from the erodibilities determined from the WEPP model. Apart from the need to use models which better account for the variations in erosive stress, consideration has to be given to the fact that erodibility is a dynamic factor that can vary rapidly between two extremes. One of these extremes is associated with detachment-limiting conditions that may often be controlled by cohesion. The other extreme is associated with the complete protection of the soil matrix by a layer of pre-detached particles. When this extreme results, interrill erodibilities are controlled by the particle size and density characteristics of the pre-detached particles. Difficulties arise in extrapolating information from one scale to another, and from one soil where erodibility experiments have been performed to others where they have not because of the dynamic nature of the rain-flow-soil surface interaction. Also, the effect of slope gradient in the interrill erosion environment varies between soils and experimental conditions because of this interaction and the differing susceptibility of soils to rilling.

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Alhassan, A., W. A. Agyare, and C. Y. Asante. "Impact of Landuse Changes on Soil Erosion and Sedimentation in the Tono Reservoir Watershed Using GeoWEPP Model." International Journal of Irrigation and Agricultural Development (IJIRAD) 1, no. 1 (January 24, 2018): 106–19. http://dx.doi.org/10.47762/2017.964x.27.

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Sediment delivery from the Tono Reservoir watershed in the Upper East Region of Ghana is of major concern, necessitating the need to estimate the rate of siltation of the reservoir. This study determined the current volume of silt in the reservoir, mapped landcover changes using Landsat images and employed Water Erosion Prediction Project (WEPP) model, to simulate hydrology and sediment dynamics for three landuse/landcover scenarios. The Geo-spatial interface for WEPP (GeoWEPP) was used to characterize upland overland flow elements based on their landuse/landcover, soil, and slope profiles. Using characteristics obtained from GeoWEPP as inputs for the WEPP model runoff fluxes, soil loss rates, and sediment delivery ratio (SDR) for three environmental scenarios: landuse/landcover with agricultural lands under fallow tilled management (Scenario 1), landuse/landcover with agricultural lands under corn, soybean no till management (Scenario 2), landuse/landcover with non-agricultural lands under shrub-perennial (Scenario 3) were estimated. Over the simulated 29-year period; runoff depth, soil loss rate and SDR were estimated to be 118.4 mm, 22.8 t/ha, and 0.68 for Scenario 1; 94.6 mm, 2.8 t/ha, and 0.31 for Scenario 2; and 57.7 mm, 0.6 t/ha, and 0.92 for Scenario 3. Shrubland had decreased by 8 %, bareland area had increased by 9.1 %, and the reservoir area had also decreased by 3.7 %. The study indicates landuse/landcover change impacts significantly on land degradation and hydrology of the Tono reservoir and subsequently accounts for the reduction in reservoir capacity by about 1.74 % on annual basis observed through the bathymetric survey.

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Ferreira, Adriano Mota, Antônio Marciano da Silva, Cláudio André dos Passos, César Henrique Valentino, Flávio Aparecido Gonçalves, and Paulo Henrique Bretanha Junker Menezes. "Estimativa da erosão hídrica do solo pelo modelo Water Erosion Prediction Project na Sub-Bacia do Córrego do Gigante, sul de Minas Gerais." Engenharia Sanitaria e Ambiental 26, no. 3 (June 2021): 471–83. http://dx.doi.org/10.1590/s1413-415220190216.

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RESUMO Objetivou-se, no presente trabalho, monitorar e identificar precipitações erosivas e as perdas de solo (PSs) por meio de parcelas experimentais instaladas na Sub-Bacia do Córrego do Gigante, calibrar o modelo Water Erosion Prediction Project (WEPP) em sua versão encosta, tendo como base os resultados obtidos nas parcelas, e aplicá-lo na área da sub-bacia, para estimativa das PSs por erosão hídrica. O regime pluvial no período de estudo apresentou elevado grau de erosividade e de concentração, pois 57,3% dos eventos foram erosivos, dos quais, os quatro de maior magnitude, participaram com 47,2% da erosividade anual. As áreas contempladas pelas interações entre classe de solo, declividade (D) e uso de solo, nas parcelas experimentais, totalizaram 174,32 ha (50% da área da sub-bacia), cujos valores obtidos resultaram em PS média ponderada de 0,623 t ha-1 ano-1, e foram referência no ajuste do modelo WEPP na versão encosta, com estimativa de 0,651 t ha-1 ano-1. A aplicação do modelo sobre uma superfície com 93,0% de abrangência da sub-bacia resultou em uma estimativa de 0,802 t ha-1 ano-1 para a taxa de PS. As áreas de solo exposto, embora participando com apenas 7,9% da área da sub-bacia, produziram 85,1% das PSs estimadas, o que, por outro lado, reflete a influência positiva da cobertura vegetal na diminuição da erosão hídrica. Simulando a implantação de cobertura sob a forma de campo/pastagem e/ou reflorestamento, nas áreas de solo descoberto, as taxas de PS na sub-bacia reduziriam significativamente para 0,215 t ha-1 ano-1.

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de Oliveira, Vinícius Naves, Gilson de F. N. Gitirana, Marcia Maria dos Anjos Mascarenha, Mauricio Martines Sales, Luiz Felipe Ramos Varrone, and Marta Pereira da Luz. "An Enhanced Flume Testing Procedure for the Study of Rill Erosion." Water 13, no. 21 (October 20, 2021): 2956. http://dx.doi.org/10.3390/w13212956.

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This paper presents the development and verification of an improved and cost-effective flume apparatus and corresponding testing methodology. A rigorous analysis of the flow conditions during testing was considered and an interpretation of test results was carried out following the premises of the Water Erosion Prediction Project (WEPP) rill erosion model. The apparatus and methodology were verified using statically compacted specimens of a latosol from the central region of Brazil. Tests were performed on samples with void ratios of 1.0 and 1.5 and under variable hydraulic conditions to verify the repeatability and ideal analysis time for the soil loss curves. The soil loss curves presented hyperbolic behavior, with a maximum value that appeared to be randomly behaved, which can be attributed to the complex nature of the erosion processes at later stages. The equipment and testing methodology produced erosion curves with repeatability that were superior with respect to their initial linear and transition portions. Recommendations are made regarding the adequate interpretation of the testing data and the selection of the ideal elapsed time for soil loss analysis.

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Fernandes, Herlander Mata, Izilda Pereida da Mata, and Albertino Vicente Fernandes. "Aplicação e validação de um simulador estocástico de variáveis climáticas. O caso da precipitação." Ingeniería del agua 12, no. 1 (March 31, 2005): 27. http://dx.doi.org/10.4995/ia.2005.2549.

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A carência de informação meteorológica é uma realidade comum a todas as regiões de Portugal. Muitos são os estudos que estão condicionados a esta lacuna o que conduz, mormente, à realização de estudos e projectos revestidos de incertezas e, talvez, à inibição de certas intervenções no âmbito da Hidrologia e Hidráulica. Neste trabalho descrevem-se a metodologia e os dados necessários para o ajustamento e aplicação do gerador climático CLIGEN no Sul de Portugal (VALE FORMOSO). Avalia-se a performance do CLIGEN na simulação da precipitação diária e mensal. A importância do conceito da normal climatológica é outro aspecto evidenciado no âmbito deste trabalho. Apresentase a análise de sensibilidade do modelo aos diferentes parâmetros de entrada – considerando três períodos distintos de registos de dados climáticos (10, 20 e 30 anos). O CLIGEN gera parâmetros climáticos indispensáveis para a aplicação de vários modelos hidrossedimentológicos dentre os quais se destacam o WEPP (Water Erosion Prediction Project), EPIC (Erosion/ Produtivity Impact Calculator), SWRRB (Simulator for Water Resources in Rural Basins), AGNPS (Agricultural Nonpoint Source Pollution Model) e CREAMS (Chemicals, Runoff, and Erosion from Agricultural Management System). Este estudo permitiu concluir que o modelo reproduz de modo significativo o padrão da precipitação e também evidencia que a extensão da série de precipitação considerada exerce considerável influência nos resultados.

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Machado, Carlos Cardoso, Alessandra Reis Garcia, Elias Silva, and Alessandro Machado Fontes. "Comparação de taxas de erosão em estradas florestais estimadas pelo modelo WEPP (Water Erosion Prediction Project) modificado em relção a medições experimentais." Revista Árvore 27, no. 3 (June 2003): 295–300. http://dx.doi.org/10.1590/s0100-67622003000300004.

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O objetivo do trabalho foi testar o modelo WEPP (Water Erosion Prediction Project), através de comparações entre volume de enxurrada e perda de solo observados experimentalmente, provenientes dos segmentos de estradas florestais submetidas à chuva natural com inclinações de 1 e 7% e comprimentos de rampa de 20 e 40 m, e aqueles preditos pelo aplicativo, visando o desenvolvimento de um modelo brasileiro de predição de erosão em estradas florestais. Na determinação da quantidade do material erodido foram instalados tambores coletores, com capacidade de 209,25 litros, localizados na parte inferior das estradas, onde foram inseridas tubulações de PVC de 2 polegadas para coleta dos sedimentos provenientes da estrada propriamente dita. Nos tambores coletores foram feitos orifícios nivelados e perfeitamente iguais, posicionados a 0,65 m do fundo do primeiro e a 0,60 m do fundo do segundo, que funcionaram como um divisor Geib. Nas parcelas de 20 e 40 m de comprimento foram feitos cinco e sete orifícios, respectivamente, no primeiro e segundo tambores. O terceiro tambor foi utilizado para coletar o excedente da enxurrada proveniente do segundo tambor. Os tambores foram ligados em série, através de cano PVC de 2 polegadas. Os dados de volume e intensidade de precipitação diária foram obtidos com a instalação de pluviômetro e pluviógrafo no local. O período de coleta de dados foi de um ano, concentrando-se na época das chuvas. Posteriormente, os arquivos de clima, precipitação, solo, inclinação e comprimento do segmento foram introduzidos e adaptados ao modelo de predição de erosão WEPP com o propósito de testá-lo, visando a confecção de um modelo apropriado às condições brasileiras.

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Akbari, Abolghasem, Leila Sedaei, Mehdi Naderi, Azizan Abu Samah, and Nazila Sedaei. "The application of the Water Erosion Prediction Project (WEPP) model for the estimation of runoff and sediment on a monthly time resolution." Environmental Earth Sciences 74, no. 7 (June 13, 2015): 5827–37. http://dx.doi.org/10.1007/s12665-015-4600-7.

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Atakora, T. "Simulation of sediment transport to Sawah rice fields by applying the water erosion prediction project (WEPP) model to a watershed in Ghana." Journal of Soil Science and Environmental Management 4, no. 3 (June 30, 2013): 46–53. http://dx.doi.org/10.5897/jssem12.002.

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Brazier, Richard E., Keith J. Beven, Jim Freer, and John S. Rowan. "Equifinality and uncertainty in physically based soil erosion models: application of the GLUE methodology to WEPP-the Water Erosion Prediction Project-for sites in the UK and USA." Earth Surface Processes and Landforms 25, no. 8 (2000): 825–45. http://dx.doi.org/10.1002/1096-9837(200008)25:8<825::aid-esp101>3.0.co;2-3.

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RAMSANKARAN, RAAJ, U. C. KOTHYARI, and J. S. RAWAT. "Simulation of surface runoff and sediment yield using the water erosion prediction project (WEPP) model: a study in Kaneli watershed, Himalaya, India / Simulation de ruissellement de surface et d'érosion à l'aide du modèle WEPP: cas du bassin versant de Kaneli, Himalaya, Inde." Hydrological Sciences Journal 54, no. 3 (June 2009): 513–25. http://dx.doi.org/10.1623/hysj.54.3.513.

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Cassol, Elemar Antonino, and Vladimir Silva de Lima. "Erosão em entressulcos sob diferentes tipos de preparo e manejo do solo." Pesquisa Agropecuária Brasileira 38, no. 1 (January 2003): 117–24. http://dx.doi.org/10.1590/s0100-204x2003000100016.

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A validação de uso de modelos de predição da erosão hídrica do solo baseados em processos físicos fundamentais necessita de informações sobre os valores de seus parâmetros obtidos em condições locais.Este trabalho foi realizado no campo em um Argissolo Vermelho distrófico típico, com o objetivo de avaliar a erosão hídrica em entressulcos sem preparo do solo (com resíduos culturais na superfície), com preparo convencional com solo descoberto (sem resíduos) e com preparo convencional com resíduos incorporados. O esquema experimental baseou-se nos estudos realizados para a determinação da erodibilidade do solo em relação ao modelo WEPP (Water Erosion Prediction Project). Foi aplicada chuva simulada com intensidade planejada de 60 mm h-1, durante 70 minutos, e coletadas amostras da enxurrada das parcelas em entressulcos. A perda de solo em entressulcos foi significativamente menor no tratamento sem preparo do solo em relação aos tratamentos submetidos ao preparo convencional. As taxas de erosão e perda de água em entressulcos foram crescentes com o tempo de chuva até atingir um ponto de valor máximo, após o qual decresceram, com exceção do tratamento sem preparo do solo, cujas taxas foram crescentes em todo o período de aplicação da chuva. O valor da erodibilidade do solo em entressulcos é de Ki = 2,83x10(6) kg s m-4.

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KLIK, A., and J. EITZINGER. "Impact of climate change on soil erosion and the efficiency of soil conservation practices in Austria." Journal of Agricultural Science 148, no. 5 (March 30, 2010): 529–41. http://dx.doi.org/10.1017/s0021859610000158.

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SUMMARYThe goal of the present study was to assess the impact of selected soil protection measures on soil erosion and retention of rainwater in a 1·14 km2 watershed used for agriculture in the north-east of Austria. Watershed conditions under conventional tillage (CT), no-till (NT) and under grassland use were simulated using the Water Erosion Prediction Project (WEPP) soil erosion model. The period 1961–90 was used as a reference and results were compared to future Intergovernmental Panel on Climate Change (IPCC) scenarios A1B and A2 (2040–60).The simulations for the NT and grassland options suggested runoff would decrease by 38 and 75%, respectively, under the current climatic conditions. The simulation results suggest that, under future climate scenarios, the effectiveness of the selected soil conservation measures with respect to runoff will be similar, or decreased by 16–53%.The actual average net soil losses in the watershed varied from 2·57 t/ha/yr for conventional soil management systems to 0.01 t/ha/yr for grassland. This corresponds to a maximum average annual loss of about 0·2 mm, which is considered to be the average annual soil formation rate and therefore an acceptable soil loss. The current soil/land use does not exceed this limit, with most of the erosion occurring during spring time. Under future climate scenarios, the simulations suggested that CT would either decrease soil erosion by up to 55% or increase it by up to 56%. Under these conditions, the acceptable limits will partly be exceeded. The simulations of NT suggested this would reduce annual soil loss rates (compared to CT) to 0·2 and 1·4 t/ha, i.e. about the same or slightly higher than for NT under actual conditions. The simulation of conversion to grassland suggested soil erosion was almost completely prevented.The selected soil conservation methods maintain their protective effect on soil resources, independent of the climate scenario. Therefore, with small adaptations, they can also be recommended as sustainable soil/land management systems under future climatic conditions.However, based on the available climate scenarios, climate-induced changes in the frequency and intensity of heavy rainstorms were only considered in a limited way in the present work. As the general future trend indicates a strong increase of rainstorms with high intensity during summer months, the results of the present study may be too optimistic.

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Lima, P. M. P., and H. Andrade. "Erodibilidade entressulcos e atributos de solos com B Textural e B Latossólico do sul de Minas Gerais." Revista Brasileira de Ciência do Solo 25, no. 2 (June 2001): 463–74. http://dx.doi.org/10.1590/s0100-06832001000200022.

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O objetivo deste trabalho foi determinar a erodibilidade entressulcos (Ki) de três solos de textura argilosa: Podzólico Vermelho-Escuro (PE) e Vermelho Amarelo (PV) e um Latossolo Roxo (LR), visando obter subsídios para a aplicação no modelo WEPP- Water Erosion Prediction Project - na região de Lavras (MG), bem como estudar a relação daquele parâmetro com alguns atributos físicos, químicos e mineralógicos dos solos. Foi adotado um delineamento experimental do tipo blocos inteiramente casualizados com os três solos, quatro declives (15, 25, 35 e 45%), cinco intensidades de chuva simulada (60, 50, 70, 90 e 120 mm h-1), com umedecimento prévio das parcelas, e cinco repetições. Foram determinados os valores de Ki, usando as intensidades médias das chuvas, as declividades das parcelas e as taxas médias de erosão entressulcos nos diversos tempos de coleta do deflúvio de cada chuva aplicada. Os resultados mostraram que o PV foi o solo que apresentou as maiores erodibilidades entressulcos (Ki) seguido do PE e LR. As erodibilidades entressulcos determinadas foram : 4,67 x 10(5) kg s m-4, para o PE; 6,85 x 10(5) kg s m-4, para o PV, e 3,38 x 10(5) kg s m-4, para o LR. Os atributos do solo que melhor se correlacionaram com a erodibilidade entressulcos foram os teores de óxidos de ferro e caulinita, a argila dispersa em água, o volume total de poros, as densidades do solo e de partículas, os teores de matéria orgânica e de agregados < 0,105 mm de diâmetro.

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Wilcox, Bradford P., Mina Sbaa, Wilbert H. Blackburn, and James H. Milligan. "Runoff Prediction from Sagebrush Rangelands Using Water Erosion Prediction Project (WEPP) Technology." Journal of Range Management 45, no. 5 (September 1992): 470. http://dx.doi.org/10.2307/4002904.

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Savabi, M. R., W. J. Rawls, and R. W. Knight. "Water Erosion Prediction Project (WEPP) Rangeland Hydrology Component Evaluation on a Texas Range Site." Journal of Range Management 48, no. 6 (November 1995): 535. http://dx.doi.org/10.2307/4003066.

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M. A. Nearing, G. R. Foster, L. J. Lane, and S. C. Finkner. "A Process-Based Soil Erosion Model for USDA-Water Erosion Prediction Project Technology." Transactions of the ASAE 32, no. 5 (1989): 1587–93. http://dx.doi.org/10.13031/2013.31195.

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Zemke, Julian J., Joshua Pöhler, and Stephan Stegmann. "Modeling Runoff-Formation and Soil Erosion after Pumice Excavation at Forested Andosol-Sites in SW-Germany Using WEPP." Soil Systems 3, no. 3 (July 31, 2019): 48. http://dx.doi.org/10.3390/soilsystems3030048.

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This study investigates the effects of pumice excavation on runoff formation and soil erosion processes in a forested catchment in SW-Germany. The underlying questions are, if (a) backfilled soils have different properties concerning runoff generation and erodibility and if (b) clear-cutting prior to excavation triggers runoff and erosion. Four adjacent sub-areas were observed, which represented different pre- and post-excavation-stages. The basis of the investigation was a comprehensive field sampling that delivered the data for physical erosion modeling using the Water Erosion Prediction Project (WEPP). Modeling took place for standardized conditions (uniform slope geometry and/or uniform land management) and for actual slope geometry and land management. The results show that backfilled soils exhibited 53% increase of annual runoff and 70% increase of annual soil loss under standardized conditions. Storm runoff was increased by 6%, while storm soil loss was reduced by 9%. Land management changes also triggered shifts in annual runoff and soil erosion: Clear-cut (+1.796% runoff, +4.205% soil loss) and bare (+5.958% runoff, +21.055% soil loss) surfaces showed the most distinct changes when compared to undisturbed forest. While reforestation largely diminished post-excavation runoff and soil erosion, the standardized results statistically prove that soil erodibility and runoff generation remain increased after backfilling.

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Papanicolaou, A. N. (Thanos), and O. Abaci. "Upland Erosion Modeling in a Semihumid Environment via the Water Erosion Prediction Project Model." Journal of Irrigation and Drainage Engineering 134, no. 6 (December 2008): 796–806. http://dx.doi.org/10.1061/(asce)0733-9437(2008)134:6(796).

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Journal articles on the topic 'Water Erosion Prediction Project (WEPP) Model'

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