Academic literature on the topic 'HYDRUS-1D'
Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles
Consult the lists of relevant articles, books, theses, conference reports, and other scholarly sources on the topic 'HYDRUS-1D.'
Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.
You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.
Journal articles on the topic "HYDRUS-1D"
1
Shelia, Vakhtang, Jirka Šimůnek, Ken Boote, and Gerrit Hoogenbooom. "Coupling DSSAT and HYDRUS-1D for simulations of soil water dynamics in the soil-plant-atmosphere system." Journal of Hydrology and Hydromechanics 66, no. 2 (June 1, 2018): 232–45. http://dx.doi.org/10.1515/johh-2017-0055.
Full textAbstract:
AbstractAccurate estimation of the soil water balance of the soil-plant-atmosphere system is key to determining the availability of water resources and their optimal management. Evapotranspiration and leaching are the main sinks of water from the system affecting soil water status and hence crop yield. The accuracy of soil water content and evapotranspiration simulations affects crop yield simulations as well. DSSAT is a suite of field-scale, process-based crop models to simulate crop growth and development. A “tipping bucket” water balance approach is currently used in DSSAT for soil hydrologic and water redistribution processes. By comparison, HYDRUS-1D is a hydrological model to simulate water flow in soils using numerical solutions of the Richards equation, but its approach to crop-related process modeling is rather limited. Both DSSAT and HYDRUS-1D have been widely used and tested in their separate areas of use. The objectives of our study were: (1) to couple HYDRUS-1D with DSSAT to simulate soil water dynamics, crop growth and yield, (2) to evaluate the coupled model using field experimental datasets distributed with DSSAT for different environments, and (3) to compare HYDRUS-1D simulations with those of the tipping bucket approach using the same datasets. Modularity in the software design of both DSSAT and HYDRUS-1D made it easy to couple the two models. The pairing provided the DSSAT interface an ability to use both the tipping bucket and HYDRUS-1D simulation approaches. The two approaches were evaluated in terms of their ability to estimate the soil water balance, especially soil water contents and evapotranspiration rates. Values of thedindex for volumetric water contents were 0.9 and 0.8 for the original and coupled models, respectively. Comparisons of simulations for the pod mass for four soybean and four peanut treatments showed relatively highdindex values for both models (0.94–0.99).
2
Anwar, A. H. M. Faisal, and Larissa Chan Thien. "Investigating Leachate Transport at Landfill Site Using HYDRUS-1D." International Journal of Environmental Science and Development 6, no. 10 (2015): 741–45. http://dx.doi.org/10.7763/ijesd.2015.v6.691.
Full text
3
Nascimento, Ícaro Vasconcelos do, Raimundo Nonato de Assis Júnior, José Carlos de Araújo, Thiago Leite de Alencar, Alcione Guimarães Freire, Márcio Godofrêdo Rocha Lobato, Cillas Pollicarto da Silva, Jaedson Claúdio Anunciato Mota, and Carla Danielle Vasconcelos do Nascimento. "Estimation of van Genuchten Equation Parameters in Laboratory and through Inverse Modeling with Hydrus-1D." Journal of Agricultural Science 10, no. 3 (February 9, 2018): 102. http://dx.doi.org/10.5539/jas.v10n3p102.
Full textAbstract:
Soil water retention curve (SWRC) becomes important because it guides when and how much to irrigate, optimizing the use of water; can be obtained in the field or laboratory, being commonly determined in the laboratory with porous plate apparatus, and the determination is compromised by issues such as time and labor. In this context, inverse modeling emerges, which allows to obtain a variable going from the effect to the cause, using Hydrus-1D. Hence, this study aims to obtain van Genuchten equation parameters through inverse modeling with Hydrus-1D and make the respective comparisons and inferences. Matric potential data were obtained over time in an instantaneous profile-type experiment. Six sets of three tensiometers each were installed surrounding the center of the experimental plot, at depths of 0.20, 0.35 and 0.50 m. Target depth was 0.35 m, where the roots of most crops are concentrated, and the other tensiometers were used to obtain the potential gradient. Matric potential data were used to feed Hydrus-1D and obtain the van Genuchten equation parameters. Laboratory curves were obtained using porous plate apparatus, with four replicates. It was concluded that, in general, the Hydrus-1D model estimates van Genuchten equation parameters and, consequently, the SWCC of an Argissolo more consistently with field conditions than those obtained in the laboratory; and, provided it is fed with field data, the Hydrus-1D simulates well the behavior of matric potential and moisture over time, reducing the time and labor in the procedures to obtain van Genuchten equation parameters in the laboratory.
4
Melo, Cristiane Ribeiro de, Paulo Abadie Guedes, Samuel França Amorim, Fellipe Henrique Borba Alves, and José Almir Cirilo. "Combined analysis of landslide susceptibility and soil water dynamics in a metropolitan area, northeast Brazil." Soils and Rocks 44, no. 2 (June 18, 2021): 1–14. http://dx.doi.org/10.28927/sr.2021.051420.
Full textAbstract:
Landslide susceptibility and water balance in the soil, in the community of Lagoa Encantada, Recife Metropolitan Area, Brazil, were assessed using the computational models SINMAP and HYDRUS-1D. The SINMAP input parameters were the physical and hydrodynamic characteristics of the soil, evidence of landslides and the DEM; and for the HYDRUS-1D model, the hydraulic parameters of the soil. For both programs, simulations were also carried out, based on the rain recorded in the area. The soil was classified using the Unified Soil Classification System (USCS). To assess infiltration processes that cause landslides, HYDRUS-1D was used, under the same scenarios simulated by the SINMAP model and also in the evaluation of the infiltrated volume, in real landslides. The SINMAP results (susceptibility maps) show a 71% increase in the susceptible area (SI < 1; SI = stability index) between the two precipitation scenarios, and are consistent with evidence of landslides. The HYDRUS-1D results complement SINMAP results and suggest that infiltration values for simulated scenarios were similar to those of real landslides. It is concluded that it is possible to map areas of greater instability and to predict possible landslides in different precipitation scenarios, by quantitatively assessing the infiltrated volume that contributes to the destabilization of the soil.
5
Saso, J. K., G. W. Parkin, C. F. Drury, J. D. Lauzon, and W. D. Reynolds. "Chloride leaching in two Ontario soils: Measurement and prediction using HYDRUS-1D." Canadian Journal of Soil Science 92, no. 2 (February 2012): 285–96. http://dx.doi.org/10.4141/cjss2011-046.
Full textAbstract:
Saso, J. K., Parkin, G. W., Drury, C. F., Lauzon, J. D. and Reynolds, W. D. 2012. Chloride leaching in two Ontario soils: Measurement and prediction using HYDRUS-1D. Can. J. Soil Sci. 92: 285–296. Deterministic numerical modelling can often be used to complement and extend field results, and to provide extra insight into the mechanisms of water and solute movement within the profile of agricultural soils. Chloride leaching and near-surface soil water content in a Guelph loam and a Maryhill loam cropped to corn (Zea mays L.) were measured over a 12-mo period (October 2007 to September 2008) and simulated using the HYDRUS-1D numerical model (version 4.12). Field measurements and prediction indicated that over 70% of the applied chloride (Cl) was lost to deep drainage (below 80 cm depth) during the winter months (November 2007 to April 2008) in both soils. Normalized root mean square error (NRMSE) values for HYDRUS-1D estimates of near-surface (0- to 30-cm depth interval) soil water content over the growing season (April to September, 2008) were 28% for Guelph loam and 42% for Maryhill loam. The NRMSE value for estimated versus measured Cl mass remaining in the soil profile (0–80 cm depth interval) over the winter months was 17% for both soils. It was concluded that the HYDRUS-1D model can provide reasonable predictions of near-surface soil water content and profile leaching losses of tracer solutes. Further work is required, however, to determine if the predictive ability of HYDRUS-1D might be improved by incorporating the effects of freeze-thaw cycles on soil hydraulic properties and solute leaching. Further study is also required to establish the model's ability to simulate the leaching behaviour of reactive solutes, such as nitrate, in agricultural soils.
6
Haowen, Xie, Wu Yawen, Wang Luping, Luo Weilin, Zhou Wenqi, Zhou Hong, Yan Yichen, and Liu Jun. "Comparing simulations of green roof hydrological processes by SWMM and HYDRUS-1D." Water Supply 20, no. 1 (October 3, 2019): 130–39. http://dx.doi.org/10.2166/ws.2019.140.
Full textAbstract:
Abstract Green roofs are a sustainable, low-impact development technique. They can reduce peak stormwater runoff and runoff volume and improve the quality of runoff from individual buildings and developments, which can lower the risk of frequent urban flooding and improve the quality of receiving waters. Few studies have compared different types of green roof models under the same rainfall intensities; thus, in this study, the predictions of a non-linear storage reservoirs model, Storm Water Management Model (SWMM), and a physical process model (HYDRUS-1D) were discussed. Both models were compared against measured data obtained from a series of laboratory experiments, designed to represent different storm categories and rainfall events. It was concluded that the total runoff of the SWMM model is always less than that of HYDRUS-1D. The maximum flowrate of the SWMM model is more than that of HYDRUS-1D during all events.
7
Sutanto, S. J., J. Wenninger, A. M. J. Coenders-Gerrits, and S. Uhlenbrook. "Partitioning of evaporation into transpiration, soil evaporation and interception: a comparison between isotope measurements and a HYDRUS-1D model." Hydrology and Earth System Sciences 16, no. 8 (August 10, 2012): 2605–16. http://dx.doi.org/10.5194/hess-16-2605-2012.
Full textAbstract:
Abstract. Knowledge of the water fluxes within the soil-vegetation-atmosphere system is crucial to improve water use efficiency in irrigated land. Many studies have tried to quantify these fluxes, but they encountered difficulties in quantifying the relative contribution of evaporation and transpiration. In this study, we compared three different methods to estimate evaporation fluxes during simulated summer conditions in a grass-covered lysimeter in the laboratory. Only two of these methods can be used to partition total evaporation into transpiration, soil evaporation and interception. A water balance calculation (whereby rainfall, soil moisture and percolation were measured) was used for comparison as a benchmark. A HYDRUS-1D model and isotope measurements were used for the partitioning of total evaporation. The isotope mass balance method partitions total evaporation of 3.4 mm d−1 into 0.4 mm d−1 for soil evaporation, 0.3 mm d−1 for interception and 2.6 mm d−1 for transpiration, while the HYDRUS-1D partitions total evaporation of 3.7 mm d−1 into 1 mm d−1 for soil evaporation, 0.3 mm d−1 for interception and 2.3 mm d−1 for transpiration. From the comparison, we concluded that the isotope mass balance is better for low temporal resolution analysis than the HYDRUS-1D. On the other hand, HYDRUS-1D is better for high temporal resolution analysis than the isotope mass balance.
8
Tárník, Andrej, and Dušan Igaz. "Validation of Hydrus 1D Model in Selected Catchment of Slovakia." Acta Horticulturae et Regiotecturae 20, no. 1 (May 1, 2017): 24–27. http://dx.doi.org/10.1515/ahr-2017-0006.
Full textAbstract:
Abstract Soil water content is very important for agricultural practice. Direct measurements of the soil moisture are being replaced by mathematical simulations and models step by step. One of the most used models for the simulation of the soil moisture is HYDRUS 1D model. This paper deals with HYDRUS 1D validity check in the Nitra River Catchment. Three different localities in the Nitra River Catchment (Malanta, Kolíňany and Dolné Naštice) were chosen for model validity check. Both, measurements and modelling of soil moisture, were made for these localities in three years (8/2011 - 8/2014). The evaluation of model validity was performed by calculation of the correlation coefficient and count of comparisons with variance of 15%. The correlation coefficients of measured and simulated data were between 0.67 and 0.95. Data comparisons with variance of 15% among measured and simulated data were between 79 to 100%. Based on these results we can declare that HYDRUS 1D model is valid for the conditions of Slovak catchments.
9
Ma, Wen Cui, Xue Yi You, Xin Xin Wang, and Yu Chen. "Numerical Simulation of Migration and Transformation of Petroleum Hydrocarbons in Soils." Advanced Materials Research 1073-1076 (December 2014): 653–56. http://dx.doi.org/10.4028/www.scientific.net/amr.1073-1076.653.
Full textAbstract:
Considering the diffusion, adsorption or desorption, and microbial degradation of petroleum hydrocarbons (PHs) in the soil–water system, the numerical model describing the migration and transportation of PHs is estabilished and it is simulated by HYDRUS-1D model. The degradation effect of time and depth variation of PHs is gained by numerical simulation. The results show that the degradation ability of indigenous microbial of PHs is poor. The HYDRUS-1D software is feasible in simulating and predicting the migration and transformation of PHs in soils.
10
Radka Kodešová and Lukáš, Brodský. "Comparison of CGMS-WOFOST and HYDRUS-1D Simulation Results for One Cell of CGMS-GRID50." Soil and Water Research 1, No. 2 (January 7, 2013): 39–48. http://dx.doi.org/10.17221/6504-swr.
Full textAbstract:
CGMS (Crop Growth Monitoring System) developed by JRC is an integrated system to monitor crop behaviour and quantitative crop yield forecast that operates on a European scale. To simulate water balance in the root zone the simulation model CGMS-WOFOST (SUPIT & VAN DER GOOT 2003) is used that is based on water storage routing. This study was performed to assess a possible impact of simplifications of the water storage routing based model on simulated water regime in the soil profile. Results of CGMS-WOFOST are compared with results of a more precise Richards’ equation based model HYDRUS-1D (ŠIMŮNEK et al. 2005). 16 scenarios are simulated using HYDRUS-1D. Each scenario represents a single soil profile presented in the selected cell of GRID50 in the Czech Republic. Geometry of the soil profiles, material (texture) definition, root distributions, measured daily rainfall, calculated daily evaporation from the bare soil surface and transpiration of crop canopy were defined similarly to CGMS-WOFOST inputs according to the data stored in the SGDBE40 database. The soil hydraulic properties corresponding to each soil layer were defined using the class transfer rules (WÖSTEN et al. 1999). The bottom boundary conditions were defined either similarly to CGMS-WOFOST bottom boundary condition as a free drainage or as a constant water level 250 cm below the soil surface to demonstrate a ground water impact on the soil profile water balance. The relative soil moisture (RSM) in the root zone during the vegetation period was calculated to be compared with the similar output from CGMS. The RSM values obtained using HYDRUS-1D are higher than those obtained using CGMS-WOFOST mostly due to higher retention ability of HYDRUS-1D. The reasonably higher RSM values were obtained at the end of simulated period using the HYDRUS-1D for the constant water level 250 cm below the soil surface.
Dissertations / Theses on the topic "HYDRUS-1D"
1
Nichols, William. "Modeling Performance of an Operational Urban Rain Garden Using HYDRUS-1D." Thesis, Villanova University, 2018. http://pqdtopen.proquest.com/#viewpdf?dispub=10811265.
Full textAbstract:
Tools for predicting rain garden performance are limited, particularly for predicting seasonal performance. Changes in temperature cause changes in the viscosity of water, infiltration rates, and evapotranspiration rates. A variably-saturated soil model, HYDRUS-1D, was calibrated and validated using observed ponding depth and soil moisture data for the Philadelphia Zoo Rain Garden, owned and operated by the Philadelphia Water Department (PWD). Warm and cold seasons were simulated with typical meteorological data and temperature-adjusted saturated hydraulic conductivity values. Design-storm simulations confirmed that the rain garden is over-performing. Maximum capacity of the system was simulated by increasing the loading ratio until overtopping occurred or ponding remained longer than 24 hours. This study will demonstrate how modeling of an operational urban rain garden offers a realistic picture of performance and could be used as a tool for informing regulations and design.
2
Inforsato, Leonardo. "Determinação das propriedades hidráulicas do solo pelo método de evaporação monitorada por atenuação de radiação gama." Universidade de São Paulo, 2018. http://www.teses.usp.br/teses/disponiveis/64/64134/tde-12112018-141229/.
Full textAbstract:
Modelos matemáticos são comumente utilizados no estudo da dinâmica da água no solo não-saturado. A principal equação para se quantificar esta dinâmica é a equação diferencial de Richards. Sua solução direta é impossível na maioria dos casos, necessitando de métodos numéricos, dos quais se destaca a utilização das funções de condutividade e de retenção de água de Van Genuchten - Mualem para obtenção da solução numérica. Diante disto, o objetivo deste trabalho foi apresentar um novo método para a obtenção dos parâmetros de Van Genuchten - Mualem, que utiliza a modelagem inversa de dados de teores de água medidos periodicamente e obtidos por experimento de evaporação assistido por atenuação de radiação gama, para a modelagem inversa foi utilizado o software Hydrus-1D. O método foi testado em amostras com diferentes texturas, colhidas em 11 localidades na região de Piracicaba-SP. Dos conjuntos de exemplares analisados, apenas um apresentou resultado insatisfatório, concluindo que o método é válidoMathematical models are commonly used in studies of water dynamics in unsaturated soil. The main equation to quantify water the dynamics is the differential Richards equation. Its analytical solution is impossible in almost all cases, requiring numerical methods, among which the Van Genuchten - Mualem water conductivity and water retention functions are frequently used to obtain the numerical solution. The objective of this work is to present a new method to obtain the Van Genuchten - Mualem parameters, using the inverse modeling of water content data measured periodically by gamma radiation attenuation in evaporating samples. Hydrus-1D software was used for the inverse modeling. The method was tested in samples with different textures, collected in 11 locations in the region of Piracicaba, state of São Paulo, Brazil. Of the sets of samples analyzed, only one presented an unsatisfactory result, concluding that the method is valid
3
Atmosudirdjo, Aryani. "Simulation of Leachate Generation from a Waste Rock Dump in Kiruna Using HYDRUS-1D." Thesis, Uppsala universitet, Institutionen för geovetenskaper, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-379225.
Full textAbstract:
The percolation of water through waste rock dumps at mine sites can lead to the production of a leachate with high concentrations of dissolved metals, sulfate and nitrogen compounds. It is important to understand how water flows in waste rock dumps in order to predict the environmental impact of this leachate on recipients. The dynamics of percolation and leachate discharge are controlled by climatological conditions at the site, where relatively large flows in northern Sweden correspond to snowmelt during late Spring. Rock dumps are often tens of meters in height, resulting in an unsaturated water flow system through heterogeneous material. Hence, the simulation of leachate generation requires an accurate representation of the subsurface materials as well as the flow processes, where water flow in waste rock dumps is dominated by matrix flow with macropore flow being of secondary importance. Matrix flow is rather slow and may thus potentially yield relatively high concentrations of contaminants in the leachate, in response to precipitation and snow melt. This study uses Hydrus-1D to predict leachate generation from a small-scale waste rock dump in Kiruna in terms of discharge magnitude and timing. The 3-dimensional geometry of the waste rock dump is approximated by summing simulations from 1225 one-dimensional columns of different length, with a surface area of 1 m2 each. There are four output parameters that are compared between the model results and measured data: snow accumulation, water content, temperature, and discharge. There are some discrepancies between the model results and field measurements, most likely due to uncertainties in the input parameters (especially waste rock properties), limitations in the Hydrus-1D model (i.e. freeze-thaw dynamics), and assumptions that are used in constructing the conceptual model. For better agreement between model results and measured data, a new modelling approach is recommended, potentially using a different program than Hydrus-1D.
4
Pinho, Roque Emmanuel da Costa de. "Teores de água e solutos no solo: desempenho e sensibilidade do modelo Hydrus-1D." Universidade de São Paulo, 2010. http://www.teses.usp.br/teses/disponiveis/11/11131/tde-25022010-154643/.
Full textAbstract:
A preocupação com o destino de produtos químicos e água, aplicados ao solo, tem motivado vários pesquisadores a desenvolverem e aplicarem modelos teóricos, objetivando descrever os processos físicos envolvidos no transporte desses produtos no perfil do solo. Nesse sentido, a presente pesquisa teve como objetivo a aplicação do modelo Hydrus-1D para simulação do movimento da água e dos íons nitrato e potássio, em condições de laboratório, utilizando-se para tal colunas segmentadas preenchidas com dois tipos de solo não-saturado (Latossolo Vermelho Amarelo e Nitossolo Vermelho), bem como avaliar o desempenho e sensibilidade do referido modelo. Para a obtenção dos parâmetros de transporte de cada soluto, foram elaboradas as curvas de distribuição de efluentes (Breakthrough Curves BTC). Os parâmetros de transporte obtidos e as condições de contorno de cada ensaio foram inseridos no modelo Hydrus- 1D para realização das simulações. O desempenho do modelo foi avaliado com base nos parâmetros estatísticos: erro máximo, erro absoluto médio, raiz quadrada do erro médio normalizado, coeficiente de massa residual, coeficiente de determinação, eficiência e índice de concordância de Willmott. A sensibilidade do modelo foi avaliada conforme o método proposto por McCuen e Snyder (1986) e a análise foi aplicada aos parâmetros: fluxo de entrada, condutividade hidráulica do solo saturado, teor de água na saturação, alfa e n (parâmetros de ajuste da curva de retenção), coeficiente de distribuição e dispersividade. Os resultados experimentais mostraram que o deslocamento do íon nitrato acompanhou a frente de molhamento e em relação ao potássio, observou-se uma maior retenção nas camadas superficiais da coluna de solo, para ambos os solos. Pôde-se concluir que o modelo Hydrus-1D foi eficiente para simulações de deslocamento de potássio e água para ambos os solos estudados e mediante a utilização do modelo de equilíbrio para o transporte de solutos no solo, o modelo Hydrus-1D não foi eficiente para simular o deslocamento de nitrato, para ambos os solos. Os procedimentos experimentais para estimativa de parâmetros de transporte, como as curvas de distribuição de efluentes, foram suficientes para descrever a movimentação de potássio no solo, gerando informações de entrada precisas para os modelos de simulação. Para a simulação do deslocamento do íon nitrato, concluiu-se que o modelo Hydrus-1D requer um processo experimental mais detalhado, sendo necessária a estimativa de um maior número de parâmetros de transporte. Em relação à análise de sensibilidade, ao simular os teores de potássio e água no solo, o modelo apresentou maior sensibilidade aos parâmetros teor de água na saturação e fluxo de entrada da solução. Tais parâmetros, portanto, precisam ser determinados com maior precisão. Houve baixa sensibilidade aos parâmetros condutividade hidráulica do solo saturado e dispersividade, para ambos os solos estudados.The concern about the fate of chemical products and water, applied to the soil, has been motivating several researchers to develop and apply theoretical models, aiming to describe the physical processes involved in the transport of those products in soil profile. The present research had as objective the application of the model Hydrus- 1D for water and solute (nitrate and potassium) simulation profile, in laboratory conditions, using soil columns filled with two types of unsaturated soil (Oxisol (Haplustox) and Hapludox), as well to evaluate the acting and sensitivity of the model. The transport parameters were obtained for each solute by breakthrough curves (BTCs). The transport parameters obtained and the boundary conditions were inserted in the Hydrus-1D model to realize the simulations. The acting of the Hydrus-1D model was evaluated using the statistical indicators: maximum error, mean absolute error, normalized root mean-square error, coefficient of residual mass, determination coefficient, efficiency and Willmott concordance index. The model sensitivity was evaluated by the method proposed by McCuen and Snyder (1986) and applied to the parameters: input flow, soil saturated hydraulic conductivity, water content (saturation point), alpha and n (soil water retention curve parameters), distribution coefficient and dispersivity. The obtained results, experimentally, showed the nitrate displacement following the wetting front and, in relation to the potassium ion, a larger retention was observed at the superficial soil columns layers. Therefore, was possible to conclude that Hydrus-1D model was efficient for both water and potassium displacement simulations, for both studied soils and by the balance model for solute transport in soil, the Hydrus- 1D model was not efficient to simulate the nitrate displacement in both soils. The experimental procedures to estimate transport parameters, by the BTCs, were enough to describe the potassium movement in soil, generating input information necessary to the model simulation. To the simulation of the nitrate displacement, was possible to conclude that the model Hydrus-1D requests a more detailed experimental process, being necessary the estimate of a larger number of transport parameters. In relation to the sensitivity analysis of the Hydrus-1D model, when simulated the content of potassium and water at the soil columns, was observed that the model shows more sensitivity about to the parameters: water content (saturation point) and input flow. This parameters need to be estimated with more precision. There was a low sensitivity to the parameters soil saturated hydraulic conductivity and dispersivity for both studied soils.
5
Vogel, Mie. "Effects of Model Spin-Up on Simulated Recharge Using the Hydrus-1D Vadose Zone Model." Thesis, Uppsala universitet, Luft-, vatten och landskapslära, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-385590.
Full textAbstract:
Groundwater is a crucial part of the hydrological cycle and is an important source for drinking water, irrigation and industry, particularly during droughts. With climate change, the hydrological variability is predicted to increase, making predictions for recharge and groundwater storage even more important to implement and to maintain sustainable water use. This study examines the importance of model spin-up in simulating recharge using the Hydrus-1D computer model. The focus is on two previously made Hydrus-1D models that represent end members in climate and hydrology; one which is a natural grassland in a semi-arid climate, while the other is a low impact development (LID) bioswale site in a Mediterranean climate. The main goal of this study is to characterize the range and causes of spin-up behavior as well as to analyze the extent of the effects that the spin-up process has on the recharge simulations. Although there has been some research on spin-up behavior for surface-water models, there is still a knowledge gap regarding the effects of model spin-up on vadose zone models simulating recharge. The initial conditions varied using three parameters for each of the two models: time (3, 15 and 30 years), initial moisture (θ = 0.1, 0.2 and 0.3) and precipitation (25% drier than historical data, historical 30-year data, 25% wetter than historical data). The output from these spin-ups were then used as initial conditions in simulating recharge using the 15-year models. The study found that the impact of spin-up is significant in the natural grassland site where there is a slow response between atmospheric forcings and recharge and where there is a relatively thick vadose zone. Especially spin-up time showed great variability and there is an inverse relationship between spin-up time and magnitude of recharge, where the longer spin-ups had lower recharge rates. Initial water content and precipitation did not result in different recharge amounts for the LID model. Length of spin-up only had very small differences in recharge for the LID models, indicating they are less sensitive to changes in initial spin-up parameters.
6
Santos, Rafaelly Suzanye da Silva. "Simulação da dinâmica do íon potássio pelo modelo HYDRUS-1D em condições de solo salino." Universidade de São Paulo, 2014. http://www.teses.usp.br/teses/disponiveis/11/11152/tde-06012015-110030/.
Full textAbstract:
A demanda alimentar vem aumentando de acordo com o crescimento populacional e com isso há uma necessidade de que as práticas agrícolas tornem-se cada vez mais intensas e tecnificadas, mediante o incremento, entre outros, da utilização de insumos químicos. Porém, uma vez aplicados de maneira desorganizada, sem a devida preocupação com os possíveis impactos aos recursos naturais, tais produtos podem vir a provocar danos ao solo, contaminação de águas subterrâneas (mediante sua lixiviação) e em alguns casos, podem ser responsáveis pelo aumento da salinidade em alguns solos da região do semiárido do nordeste brasileiro. Nesse sentido, devido ao fato de envolverem processos físicos na natureza, o estudo da dinâmica desses produtos químicos têm motivado diversos pesquisadores a aplicarem ferramentas matemáticas (modelos matemáticos) na área de engenharia de água e solo, buscando entender a correlação entre a dinâmica da água e o movimento de solutos no perfil do solo. Portanto, a presente pesquisa tem como objetivo a aplicação do modelo matemático HYDRUS-1D para a simulação do movimento da água e do íon potássio, em condições de laboratório, utilizando-se colunas preenchidas com dois tipos de material de solos salinos e não saturados: Argissolo Amarelo (S1) e Latossolo Vermelho Amarelo (S2). Além disso, buscou-se também avaliar tanto o desempenho do referido modelo, em condições salinas, quanto proceder a uma análise de sensibilidade. Para alcançar tais objetivos, foram conduzidas as seguintes etapas: 1) elaboração de curvas de distribuição de efluentes (Breakthrough Curves - BTC) para obtenção dos parâmetros de transporte do íon potássio, com a aplicação de soluções de 1000 ppm, 2000 ppm e 3000 ppm de concentração de potássio, nos dois tipos de solos salinos, 2) Aplicação dessas soluções de potássio na coluna preenchida com o mesmo material de solo salino não saturado, 3) Simulação dos perfis de água e potássio para os diferentes materiais de solo salino pelo modelo HYDRUS-1D e 4) Avaliação de desempenho e análise de sensibilidade do modelo HYDRUS-1D. A avaliação de desempenho foi feita levando-se em conta os seguintes índices estatísticos: erro máximo, erro absoluto médio, raiz quadrada do erro médio normalizado, coeficiente de massa residual, coeficiente de determinação, eficiência e índice de concordância de Willmott e a análise de sensibilidade foi feita mediante a determinação do erro padrão, por meio de variações positivas (+ 10%, + 20%, + 30%, + 40%, + 50%) e negativas (- 10%, - 20%, - 10%, - 40%, - 50%), dos valores de: umidade volumétrica do solo saturado, condutividade hidráulica e os parâmetros n e ? do modelo de van Genuchten (1980). Diante dos resultados obtidos, pôde-se perceber que os procedimentos experimentais (BTC\'s) para a estimativa dos parâmetros de transporte do íon potássio em condições de solo salino, foram suficientes para descrever a movimentação do íon potássio no solo, gerando informações de entrada precisas para os modelos de simulação. Em termos do modelo HYDRUS-1D, observou-se que o deslocamento do íon potássio acompanhou a frente de molhamento e que o modelo foi eficiente nas simulações de deslocamento do íon potássio e da água para ambos os solos, em condições salinas. A análise de sensibilidade evidenciou que o modelo apresentou-se sensível, às variações negativas dos dados de entrada: umidade volumétrica do solo saturado, condutividade hidráulica do solo saturado e parâmetros \"n\" e \"?\" do modelo de van Genuchten (1980).The increased demand for food due to population growth requires that agricultural practices become increasingly intensive and very technical, including the increased use of agricultural chemicals (fertilizers). If improperly applied without considering possible impacts on natural resources, agricultural chemicals may lead to soil and groundwater contamination through their leaching from the soil root zone. They may be responsible also for increased salinity in some soils of semiarid regions in northeastern Brazil. Since many transient physical and chemical processes affect their transport in the subsurface, mathematical models have become popular tools in soil and water engineering and management in order to understand the correlation between water dynamics and solute movement in soils. Thus, this research aimed at using the HYDRUS-1D software package to simulate water and potassium movement, under laboratory conditions, in unsaturated saline soil columns filled with two soil types: an Ultisol (S1) and an Oxisol (S2). Comparisons were made with experimental data while also a sensitivity analysis was carried out to evaluate the effect of various parameters on solute transport under saline conditions. For this purpose the following studies were performed: 1) Measurement of solute breakthrough curves (BTCs) to estimate the transport parameters of the potassium ion by applying potassium solutions of 1,000 ppm, 2,000 ppm and 3,000 ppm to both soil types, 2) Application of similar potassium solutions to columns containing the same saline unsaturated soils, 3) Simulation of water and potassium distributions for different saline soil materials using HYDRUS-1D, and 4) Performance evaluation and sensitivity analyses of the HYDRUS-1D numerical model. The performance evaluation was conducted using the following statistical indices: maximum error, mean absolute error, normalized root mean square error, coefficient of residual mass, coefficient of determination, efficiency and Willmott\'s concordance index. The sensitivity analyses considered standard deviations resulting from positive and negative changes (+ 10% + 20% + 30% + 40% + 50%) (-10%, -20%, -10%, -40%, -50%) in the values of the saturated volumetric soil moisture content, the saturated hydraulic conductivity, and the parameters n and ? of van Genuchten\'s (1980) model for the unsaturated soil hydraulic functions. Results indicate that the experimental procedures (BTCs) for estimating the transport parameters of potassium for saline soil conditions were sufficient to describe potassium ion transport in the soils by generating the required input information for the simulation models. Relative to HYDRUS-1D model, the displacement of potassium was found to follow closely the wetting front, with the model providing a very efficient means for simulating the movement of both water and potassium in the two soils during saline conditions. The sensitivity analysis showed that the model was relatively sensitive to negative variations of the input data, notably the saturated water content, the saturated hydraulic conductivity, and the n and ? soil hydraulic parameters.
7
Tyaquiçã, da Silva Santos Pedro. "Balanço hídrico em teto com cobertura vegetal no semiárido pernambucano." Universidade Federal de Pernambuco, 2011. https://repositorio.ufpe.br/handle/123456789/5886.
Full textAbstract:
Made available in DSpace on 2014-06-12T17:42:16Z (GMT). No. of bitstreams: 2
arquivo7111_1.pdf: 1388033 bytes, checksum: 645508c7ef101ae31fed17e866992644 (MD5)
license.txt: 1748 bytes, checksum: 8a4605be74aa9ea9d79846c1fba20a33 (MD5)
Previous issue date: 2011Faculdade de Amparo à Ciência e Tecnologia do Estado de Pernambuco
Na atualidade, metade da população mundial reside nos grandes centros urbanos. Grande parcela desse crescimento tem ocorrido em países em desenvolvimento. No Brasil, já se verifica um contingente de cerca de 80% da população residindo nas áreas urbanas. Neste crescente cenário de urbanização, impactos ambientais e socioeconômicos decorrentes de eventos hidrológicos têm sido recorrentes, afetando grande parte da população. O aumento da impermeabilização reduz as taxas de infiltração, que por sua vez leva à diminuição das taxas de recarga para os aquíferos e à diminuição do escoamento de base. O escoamento superficial é intensificado, aumentando em velocidade e, a frequência e magnitude dos picos de cheia, levando ocasionalmente às enchentes. Nesse contexto, têm sido empregados os telhados verdes em várias partes do mundo principalmente com finalidades estéticas de valorização do espaço urbano e para melhoria do conforto ambiental. Essas áreas verdes podem servir também para detenção do escoamento superficial, minimizando as enchentes urbanas. A simulação da dinâmica da água no solo do telhado verde realizada no programa Hydrus 1-D, a partir das características do sistema do teto verde implantado e dados obtidos em campo, proporcionou a caracterização da dinâmica da água em seu perfil de solo, fornecendo subsídios quanto ao desempenho deste dispositivo no amortecimento do escoamento superficial oriundo dos telhados
8
Mallmann, Fábio Joel Kochem. "Modelagem na transferência de cobre e zinco em solos contaminados por dejetos líquidos de suínos." Universidade Federal de Santa Maria, 2013. http://repositorio.ufsm.br/handle/1/3345.
Full textAbstract:
Coordenação de Aperfeiçoamento de Pessoal de Nível SuperiorSoils subjected to successive pig slurry (PS) amendments present zinc (Zn) and copper (Cu) increases, mostly on soil surface layer. The continuous application of PS causes accumulation of these heavy metals (HM) in soil, increasing risks for environmental contamination. Therefore, development of methods to estimate Zn and Cu accumulation in surface layer and their movement in soil is very important for the management planning of PS and of the agricultural soils amended with these residues. The main objective of this work was to model the vertical transport of Zn and Cu in profile of agricultural soils receiving successive application of PS at high, moderate and low doses, evaluating the effects of soil tillage and water absorption by roots on the movement of these HM. We also aimed to predict the long-term accumulation of HM in soil surface and their transport into groundwater, comparing estimated results with the threshold values established for agricultural soils and groundwater by the Conselho Nacional do Meio Ambiente (CONAMA). Two studies were performed on field experiments composed by different PS doses, the first located on an Alfisol in Santa Maria RS, and the second on an Oxisol in Campos Novos SC. Hydro-physical and chemical characteristics of these soils were measured and, accompanied by atmospheric and PS application data sets, were introduced into HYDRUS-1D for parameterization of the two-site model used. In the first study, simulations for next 100 years were performed under scenarios combining two PS doses and four time intervals between soil tillage of the arable layer. The solute transport model used on these simulations was already validated for this local soil in another study. In the second study, the validation of a solute transport model was carried out primarily, following the same approaches used for the Alfisol. Afterwards, root water uptake and root growth modules were introduced to the model. The future scenarios were simulated using applications of different PS doses during the next 50 years. The solute transport model previously validated for the Alfisol was also validated for the Oxisol, and the introduction of the root modules in HYDRUS-1D produced even better results. This increased the usefulness of the model for its use in simulations related to Zn and Cu transport on other contaminated soils. Future scenarios exhibit a great accumulation of these two HM in soil surface layer during the simulated times. Moreover, when soils are submitted to high PS annual doses, its Cu concentrations reached the maximum values established by CONAMA for agricultural soils in approximately 94 years on the Alfisol and in 29 years on the Oxisol. Reduction in PS doses and sporadic soil tillage are strategies that slow the increase of these HM concentrations in soil surface layer, decreasing so the environmental risks and making PS additions on agricultural soils viable for longer time.
Solos submetidos a sucessivas aplicações de dejeto líquido de suínos (DLS) apresentam incrementos nos seus teores de zinco (Zn) e cobre (Cu), principalmente na camada superficial. A continuidade dessa prática faz com que esses metais pesados (MP) se acumulem no solo, aumentando o potencial de contaminação do ambiente. Dessa forma, o desenvolvimento de métodos que estimem o acúmulo superficial e o movimento de Zn e Cu no solo é de extrema importância no planejamento do manejo dos DLS e dos solos agrícolas que recebem esses resíduos. O trabalho objetivou modelar o transporte vertical de Zn e Cu no perfil de solos agrícolas contaminados por aplicações sucessivas de altas, moderadas e baixas doses de DLS, avaliando o efeito do revolvimento do solo e da absorção de água pelas raízes no movimento desses MP, prevendo, no longo prazo, seus acúmulos na camada superficial do solo e suas transferências rumo ao lençol freático, confrontando os resultados estimados com os respectivos limites de concentração para solos agrícolas e águas subterrâneas estabelecidos pelo Conselho Nacional do Meio Ambiente (CONAMA). Foram realizados dois estudos em experimentos de campo com diferentes doses de DLS, o primeiro localizado sobre um Argissolo, em Santa Maria RS, e o segundo sobre um Latossolo, em Campos Novos SC. Diversas características físico-hídricas e químicas foram determinadas nesses solos para, juntamente com os dados atmosféricos e do histórico de aplicação de DLS nessas áreas, serem introduzidos no HYDRUS-1D para parametrização do modelo químico de dois sítios utilizado. No primeiro estudo foram realizadas simulações para os próximos 100 anos, considerando cenários combinando duas doses de DLS e quatro intervalos de tempo entre revolvimentos periódicos da camada arável do solo. O modelo de transporte de solutos utilizado nessas simulações já havia sido validado para o solo deste local em outro trabalho. No segundo estudo foi feita a validação de um modelo de transporte de solutos, seguindo as mesmas premissas do modelo utilizado no Argissolo. Posteriormente, módulos de absorção de água e crescimento de raízes foram incorporados ao modelo. Realizaram-se então simulações futuras de cenários considerando aplicações de diferentes doses de DLS durante os próximos 50 anos. O modelo de transporte de solutos validado previamente no Argissolo foi validado também no Latossolo, apresentando resultados ainda melhores quando os módulos de raízes foram introduzidos no HYDRUS-1D. Isso aumenta a abrangência desse modelo para simular o transporte de Zn e Cu em outros solos contaminados. Os cenários futuros mostram que ocorre grande acúmulo desses MP na camada superficial do solo durante os períodos simulados. Além disso, quando os solos são submetidos a altas doses anuais de DLS, as suas concentrações de Cu atingem os valores máximos estipulados pelo CONAMA, para solos agrícolas, em aproximadamente 94 anos no Argissolo e 29 anos no Latossolo. Reduzir as doses de DLS e revolver o solo esporadicamente são alternativas que retardam o aumento da concentração desses MP na camada superficial do solo, diminuindo o potencial de impacto ao ambiente e tornando a adição de DLS em áreas agrícolas viável por mais tempo.
9
Sun, Hongyan. "Characterizing Water and Nitrogen Dynamics in Urban/Suburban Landscapes." DigitalCommons@USU, 2011. https://digitalcommons.usu.edu/etd/1073.
Full textAbstract:
This research investigated the water use of different plant types in urban landscapes, nitrogen (N) and water transport in turf, and potential N leaching from urban landscapes to ground water. In the first study, three landscape treatments integrating different types of plants—woody, herbaceous perennial, turf—and putative water use classifications—Mesic, Mixed, Xeric—were grown in large drainage lysimeters. Each landscape plot was divided into woody, turf, and herbaceous perennial plant hydrozones and irrigated for optimum water status over two years, with water use measured using a water balance approach. For woody plants and herbaceous perennials, canopy cover, rather than plant type or water use classification, was the key determinant of water use relative to reference evapotranspiration (ETo) under well-watered conditions. For turf, monthly evapotranspiration (ETa) followed a trend linearly related to ETo. In the second study, water transport parameters were calibrated using an inverse simulation with Kentucky bluegrass (KBG). Subsequently, those parameters were applied to simulate water use by tall fescue (TF) and buffalograss (BG) turfgrasses using numerical modeling (Hydrus-1D). By using the calibrated soil hydraulic parameters obtained from the water transport simulation, N transport and transformation was modeled with Hydrus- 1D under different irrigation rates and different fertilization rates. Different soil texture scenarios were also simulated to demonstrate the influence of soil texture on N leaching. In the third study, the simulated N-leaching from different soil textures was integrated into a Geographic Information System (GIS) approach to estimate NO3-N leaching mass from urban turf areas. Nitrate-N leaching risks to ground water under overirrigation and overfertilization scenarios and efficient irrigation and fertilization scenarios were estimated. The results showed improvement of turf irrigation and fertilization management may decrease N-leaching significantly and greatly decrease the risk of ground water being contaminated by NO3-N leaching in the Salt Lake Valley.
10
Parajuli, Kshitij. "Advancing Methods to Quantify Actual Evapotranspiration in Stony Soil Ecosystems." DigitalCommons@USU, 2018. https://digitalcommons.usu.edu/etd/7242.
Full textAbstract:
Water is undeniably among the most important natural resources and the most critical in semi-arid regions like the Intermountain West of the United States. Such regions are characterized by low precipitation, the majority of which is transferred to the atmosphere from the soil and vegetation as evapotranspiration (ET). Quantification of ET is thus crucial for understanding the balance of water within the region, which is important for efficiently planning the available water resources. This study was motivated towards advancing the estimation of actual ET (ETA) in mountain ecosystems, where the variation in different types of vegetation and non-uniformity of soil including considerable stone content creates challenges for estimating water use as ET. With the aim of addressing the effect of stone content in controlling soil moisture and ET, this study examined the influence of stone content on bulk soil hydraulic properties. An averaging model referred to as a binary mixing model was used to describe the way in which water is held and released in stony soil. This approach was based on the individual hydraulic behavior of the background soil and of the stones within the soil. The effect of soil stone content on ETA was evaluated by accounting for the water retention properties of stones in the soil using a numerical simulation model (HYDRUS-1D). The results revealed overestimation of simulated ETA when effects of stone content were not accounted for in comparison to ETA measured by the state-of-the-art “eddy covariance” measurement method for ETA. An even larger-scale model was evaluated, named the Noah-Multiphysics (Noah-MP) land surface model. The land surface model was run using different arrangements of complexity to determine the importance of stone content information on simulation results. The version of the model with information about stone content along with detailed soil properties was able to provide the best Noah-MP prediction of ET. The study suggests that improvement in representation of soil properties including stone content information, can substantially advance the ability of numerical and land surface models to more accurately simulate soil water flow and ETA.
Book chapters on the topic "HYDRUS-1D"
1
Bekele, Enguday, Seifu Tilahun, Abebech Beyene, Sisay Asres, Berhanu Geremew, and Haimanot Atinkut. "Soil Water Dynamics on Irrigated Garlic and Pepper Crops Using Hydrus–1D Model in the Lake Tana-Basin, Northwestern Ethiopia." In Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering, 193–209. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-43690-2_13.
Full text
2
Reem, Abukmeil, Guizani Mokhtar, Ito Ryusei, and Funamizu Naoyuki. "Assessment of Different Irrigational Practices on Managing the Nitrogen Loss into the Groundwater Using HYDRUS-1D Numerical Software Gaza Strip as a Case Study—Palestine." In Recent Advances in Environmental Science from the Euro-Mediterranean and Surrounding Regions, 653–57. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-70548-4_195.
Full text
3
"Modeling Flow through the Vadose Zone Using the HYDRUS-1D Model." In Soil Physics, 357–408. CRC Press, 2013. http://dx.doi.org/10.1201/b14926-18.
Full text
4
Agah, Ali Erfani, Patrick Meire, and Eric de Deckere. "Simulation of Phosphorus Transport in Soil Under Municipal Wastewater Application Using Hydrus-1D." In Soil Contamination - Current Consequences and Further Solutions. InTech, 2016. http://dx.doi.org/10.5772/66214.
Full text
5
Erfani Agah, Ali. "Numerical Modeling of Soil Water Flow and Nitrogen Dynamics in a Tomato Field Irrigated with Municipal Wastewater." In Recent Advances on Numerical Simulations [Working Title]. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.98487.
Full textAbstract:
Because of water scarcity, reduction of annual rainfall and the use of wastewater in agriculture, there is a need for research to evaluate the potential impacts of using such sources on hydraulic soil properties and groundwater quality. Nitrate loss from the area under cultivation and regular use of fertilizer and wastewater is a major reason for non-point source contamination on agricultural lands. Numerical model, Hydrus-1D used to simulate soil nitrate in soil cultivated with tomato-crop during the growing period, in North-East Iran. A randomized completely blocked design with five irrigation treatments with different sources of nitrogen was applied. Comparison between simulated and measured soil moisture content shows that the model can follow the temporal variation of soil water content. However, some over estimation of the measured data was observed during the simulation period. To evaluate the Hydrus model performance with respect to nitrogen transport and transformations, the simulated nitrogen concentrations (NH4-N and NO3-N) are compared for different treatments at different depths of soil profile, (7.5, 22.5, 37.5, 52.5 and 120 cm from soil surface). It takes about 4 days to convert 90% of urea into ammonium and it takes about 70 days to convert 90% of ammonium into nitrate. However, urea concentrations decreased with time between irrigations as a result of hydrolysis. As expected, at 3.73 days, the urea was concentrated near the surface, immediately after fertigation. Ammonium remained concentrated in the immediate in the top soil at all times for all treatments. There was only slight movement, because of soil adsorption and subsequent fast nitrification and/or root uptake. In contrast to ammonium, nitrate moved continuously downwards during the 28-day simulation period, as nitrate is not adsorbed, whereas denitrification was assumed negligible. Leaching percentages were smaller for nitrate wastewater compared to nitrate- fertilizer, and manure. Base on simulation results treated municipal wastewater by an aerated lagoon can be used as a valuable source of irrigation without causing contamination of groundwater.
Conference papers on the topic "HYDRUS-1D"
1
"HYDRUS-1D Simulations of potassium transport in a saline tropical soil." In 2015 ASABE International Meeting. American Society of Agricultural and Biological Engineers, 2015. http://dx.doi.org/10.13031/aim.20152189276.
Full text
2
White, William J., and Jonathan M. Malzone. "ONE-DIMENSIONAL SOIL MOISTURE FLOW MODELING OF RIDGETOP WETLANDS USING HYDRUS-1D." In GSA 2020 Connects Online. Geological Society of America, 2020. http://dx.doi.org/10.1130/abs/2020am-356235.
Full text
3
Li, Yong, Yu Zhang, and Chun-hui Huang. "Simulating Water Transport and Loss in a Direct-Seeded Paddy Field Using Hydrus-1D." In 2010 International Conference on Multimedia Technology (ICMT). IEEE, 2010. http://dx.doi.org/10.1109/icmult.2010.5631387.
Full text
4
Dobre, Roxana-Gabriela. "SNOWMELT INFILTRATION USING HYDRUS-1D BASED ON A SNOW SURFACE ENERGY BALANCE MODEL FOR BUCEGI MOUNTAINS, ROMANIA." In 17th International Multidisciplinary Scientific GeoConference SGEM2017. Stef92 Technology, 2017. http://dx.doi.org/10.5593/sgem2017/32/s13.063.
Full text
5
SOBENKO, L. R., L. BRICHI, O. A. S. FIGUEIRA, J. H. MIRANDA, A. O. GONÇALVES, and S. N. DUARTE. "SENSITIVITY ANALYSIS OF THE HYDRUS-1D MODEL IN THE SIMULATION OF POTASSIUM TRANSPORT IN TWO BRAZILIAN SOILS." In IV Inovagri International Meeting. Fortaleza, Ceará, Brasil: INOVAGRI/ESALQ-USP/ABID/UFRB/INCT-EI/INCTSal/INSTITUTO FUTURE, 2017. http://dx.doi.org/10.7127/iv-inovagri-meeting-2017-res3250862.
Full text
6
Mishra, Ashutosh, Paras Pujari, Shalini Dhyani, and Parikshit Verma. "Soil-water dynamics in flood irrigated orange orchard in central India: Integrated approach of sap flow measurements and HYDRUS 1D model." In 5th International Electronic Conference on Water Sciences. Basel, Switzerland: MDPI, 2020. http://dx.doi.org/10.3390/ecws-5-08467.
Full text
7
Antonov, Dimitar. "APPLICATION OF HYDRUS-1D FOR EVALUATION OF THE VADOSE ZONE SATURATION STATE IN CONNECTION WITH ARSENIC MOBILIZATION AND TRANSPORT IN CONTAMINATED RIVER FLOODPLAIN - OGOSTA VALLEY CASE STUDY, NW BULGARIA." In 18th International Multidisciplinary Scientific GeoConference SGEM2018. Stef92 Technology, 2018. http://dx.doi.org/10.5593/sgem2018/1.2/s02.011.
Full text
8
Wang, Xiao, Yongtu Liang, Shengli Liu, and Mengyu Wu. "Analysis of Products Pipeline Accident Infiltration Process in Surface Soil Condition." In ASME 2019 Pressure Vessels & Piping Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/pvp2019-93069.
Full textAbstract:
Abstract The most common way of transportation for refined oil is long-distance pipeline. Pipeline accidents occur frequently due to corrosion, equipment failure, external forces destruction. Aiming at predicting the contaminated area in soil caused by products pipeline accidents, this experimental study was conducted to examine the relationship between the light non-aqueous phase liquids (LNAPL) accumulative infiltrate volume and the time of infiltration process in homogeneous and layered soils. The soil’s hydraulic parameters were obtained by basic experiments and RETC software. Compared with traditional infiltration mathematical model, Green-Ampt model is the most common mathematical model to calculate the infiltration process in the unsaturated soil. In this study, a modified Green-Ampt model was developed to describe water and diesel infiltration through a 100-cm-long and layered soil column. In the modified Green-Ampt model, an infiltration reduction ratio was introduced to describe the effect of the hydraulic conductivity of the layered position. To evaluate the proposed method in the effect of the layers position infiltration permeability, eight constant water head layered column infiltration experiment were conducted to record the different infiltration fluid and different constant water head infiltration process. Compared the experiment results with traditional mathematical traditional Green-Ampt model (average R2 = 0.976) and Hydrus-1D software (average R2 = 0.988) The modified Green-Ampt model had relatively higher precision in accumulative infiltrate volume (average R2 = 0.992) and the wetting front velocity in infiltration process (average R2 = 0.997). Thus, the modified mathematical model was applied an effective upscaling scheme in layered formations. The experimental result also demonstrated that soil layering affected the infiltration process. With the increase of soil depth and density, the infiltration speed of the layered soil column decreased. Additionally, the infiltrate speed of wetting front decreases slowly at the layered surface. The experiment’s fitting results showed that the modified mathematical model about infiltrate time and liquid contaminant accumulative infiltrate volume, wetting front infiltrate velocity can highly effective approach to simulate water and light non-aqueous phase liquids (LNAPL) infiltration process in layered soils.