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Journal articles on the topic 'Geomorphological Instantaneous Unit Hydrographs'

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Author: Grafiati

Published: 6 September 2023

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1

Khaleghi, M. R., J. Ghodusi, and H. Ahmadi. "Regional analysis using the Geomorphologic Instantaneous Unit Hydrograph (GIUH) method." Soil and Water Research 9, No. 1 (January 23, 2014): 25–30. http://dx.doi.org/10.17221/33/2012-swr.

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The construction of design flood hydrographs for ungauged drainage areas has traditionally been approached by regionalization, i.e. the transfer of information from the gauged to the ungauged catchments in a region. Such approaches invariably depend upon the use of multiple linear regression analysis to relate unit hydrograph parameters to catchment characteristics and generalized rainfall statistics. In the present study, Geomorphologic Instaneous Unit Hydrograph (GIUH) was applied to simulate the rainfall-runoff process and also to determine the shape and dimensions of outlet runoff hydrographs in a 37.1 km<sup>2</sup> area in the Ammameh catchment, located at northern Iran. The first twenty-one equivalent rainfall-runoff events were selected, and a hydrograph of outlet runoff was calculated for each event. An intercomparison was made for the three applied approaches in order to propose a suitable model approach that is the overall objective of this study. Hence, the time to peak and peak flow of outlet runoff in the models were then compared, and the model that most efficiently estimated hydrograph of outlet flow for similar regions was determined. Statistical analyses of the models demonstrated that the GIUH model had the smallest main relative and square error. The results obtained from the study confirmed the high efficiency of the GIUH and its ability to increase simulation accuracy for runoff and hydrographs. The modified GIUH approach as described is therefore recommended for further investigation and intercomparison with regression-based regionalization methods.

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2

Hall, M. J., A. F. Zaki, and M. M. A. Shahin. "Regional analysis using the Geomorphoclimatic Instantaneous Unit Hydrograph." Hydrology and Earth System Sciences 5, no. 1 (March 31, 2001): 93–102. http://dx.doi.org/10.5194/hess-5-93-2001.

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Abstract. The construction of design flood hydrographs for ungauged drainage areas has traditionally been approached by regionalisation, i.e. the transfer of information from the gauged to the ungauged catchments in a region. Such approaches invariably depend upon the use of multiple linear regression analysis to relate unit hydrograph parameters to catchment characteristics and generalised rainfall statistics. The concept of the geomorphological instantaneous unit hydrograph (GIUH), in relating the shape and scale of the catchment transfer function to stream network topology and channel characteristics, offers an alternative methodology. GIUH derivation depends upon a series of assumptions, including that of estimating a "characteristic velocity"; these continue to attract attention and debate. However, if this velocity is expressed in terms of the kinematic wave approximation, the peak and time-to-peak of the IUH may be expressed in terms of a group of catchment and channel characteristics and the intensity of rainfall excess, giving the so-called geomorphoclimatic IUH (GCIUH). Previous studies involving the GCIUH have developed a single IUH relating to the total duration of rainfall excess. In this study, the rainfall excess duration was divided into several (equal) time increments, with separate IUHs being generated for each interval. This quasi-linear approach was applied to 105 storm events from nine catchments in the south-west of England, ranging in size from 6 to 420 (km)2 . The results showed that, providing the time interval chosen is fine enough to capture the shape of the runoff hydrographs, a comparable level of goodness-of-fit can be obtained for catchments covering a range of about 1:75 in area. The modified GCIUH approach as described is therefore recommended for further investigation and intercomparison with regression-based regionalisation methods. Keywords: floods; geomorphology; rainfall-runoff modelling

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3

Sulistyowati, Anantri, Rachmad Jayadi, and Adam Pamudji Rahardjo. "Unit Hydrograph Modeling using Geomorphological Instantaneous Unit Hydrograph (GIUH) Method." Journal of the Civil Engineering Forum 4, no. 3 (September 25, 2018): 223. http://dx.doi.org/10.22146/jcef.38860.

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Flood forecasting at Wonogiri Reservoir is restricted on the availability of hydrologic data due to limited monitoring gauges. This issue triggers study of unit hydrograph modeling using Geomorphological Instantaneous Unit Hydrograph (GIUH) which is based on Geographic Information System (GIS). Analysis of physical watershed parameters was conducted on Digital Elevation Model (DEM) data using software Watershed Modeling System (WMS) 10.1 and ArcGIS. Nash model and S-curve method were used to process triangular GIUH into hourly Instantaneous Unit Hydrograph (IUH) and Unit Hydrograph (UH) and then was compared with the observed UH of Collins method. A sensitivity analysis was conducted on parameter of RL and Nash-model k. Evaluation of accuracy of the simulated GIUH runoff hydrograph was also conducted. The GIUH model generated UH with smaller peak discharge Qp, also slower and longer of tp and tb values than the observed UH. Accuracy test of the simulated GIUH runoff hydrograph using Nash-Sutcliffe Efficiency (NSE) shows that Keduang watershed gives a satisfying result, while Wiroko watershed gives less satisfactory result. The inaccuracies occur due to limited flood events used to derive the observed UH and stream tributaries that were not properly modeled based on Strahler method.

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4

Goñi, Mikel, J. Javier López, and Faustino N. Gimena. "Geomorphological instantaneous unit hydrograph model with distributed rainfall." CATENA 172 (January 2019): 40–53. http://dx.doi.org/10.1016/j.catena.2018.08.010.

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5

Fleurant, C., B. Kartiwa, and B. Roland. "Analytical model for a geomorphological instantaneous unit hydrograph." Hydrological Processes 20, no. 18 (2006): 3879–95. http://dx.doi.org/10.1002/hyp.6162.

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6

Wang, Ying, and Yeou‐Koung Tung. "Stochastic generation of geomorphological instantaneous unit hydrograph‐based flow hydrograph." International Journal of River Basin Management 4, no. 1 (March 2006): 49–56. http://dx.doi.org/10.1080/15715124.2006.9635275.

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7

Shamseldin, A. Y., and J. E. Nash. "The geomorphological unit hydrograph – a critical review." Hydrology and Earth System Sciences 2, no. 1 (March 31, 1998): 1–8. http://dx.doi.org/10.5194/hess-2-1-1998.

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Abstract. The theory of the geomorphological unit hydrograph (GUH) is examined critically and it is shown that the inherent assumption that the operation of the drainage network may be modelled by a corresponding network of linear reservoirs so restricts the instantaneous unit hydrograph (IUH) shape that the effects of further restrictions, reflecting the constraints imposed by the geomorphological laws of the channel network, cannot easily be identified. Without such identification, the geomorphological unit hydrograph theory is untestable and must remain only a plausible hypothesis providing an indication of a two-parameter IUH whose shape and scale factors must still be related empirically to appropriate catchment characteristics.

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8

Singh, V. P., C. Corradini, and F. Melone. "A Comparison of Some Methods of Deriving the Instantaneous Unit Hydrograph." Hydrology Research 16, no. 1 (February 1, 1985): 1–10. http://dx.doi.org/10.2166/nh.1985.0001.

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The geomorphological instantaneous unit hydrograph (IUH) proposed by Gupta et al. (1980) was compared with the IUH derived by commonly used time-area and Nash methods. This comparison was performed by analyzing the effective rainfall-direct runoff relationship for four large basins in Central Italy ranging in area from 934 to 4,147 km2. The Nash method was found to be the most accurate of the three methods. The geomorphological method, with only one parameter estimated in advance from the observed data, was found to be little less accurate than the Nash method which has two parameters determined from observations. Furthermore, if the geomorphological and Nash methods employed the same information represented by basin lag, then they produced similar accuracy provided the other Nash parameter, expressed by the product of peak flow and time to peak, was empirically assessed within a wide range of values. It was concluded that it was more appropriate to use the geomorphological method for ungaged basins and the Nash method for gaged basins.

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9

Malleswara Rao, B. N. "Geomorphological Instantaneous Unit Hydrograph (GIUH) for an Ungauged Watershed." CVR Journal of Science & Technology 15, no. 1 (December 31, 2018): 17–21. http://dx.doi.org/10.32377/cvrjst1503.

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10

Hanif, Fatima, and Ahsan Ali. "Direct runoff hydrograph model’s collation for a Pakistan’s region." Mehran University Research Journal of Engineering and Technology 41, no. 4 (February 14, 2023): 198. http://dx.doi.org/10.22581/muet1982.2204.20.

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Rainfall-Runoff modeling is among the classical applications of hydrology. This paper examines the results of 3 hydrologic approaches, particularly Clark Model, Nash Model, and Geomorphic Instantaneous Unit Hydrograph Model. Assumptions are forwarded for the long run use of the Rawalpindi Division, Pakistan’s Small Dam Organization. The catchment of Shahpur Dam was an area under consideration for the study. The Digital elevation model (DEM) was implicated to measure the Nash and Clark model’s geomorphic parameters. Using ArcGIS, catchment satellite imagery was processed to estimate geomorphological parameters. The models have been applied to multiple storm cases. Geographic Instantaneous Unit Hydrograph (GIUH) model gave direct surface runoff hydrograph, whereas, on measured precipitation excess rainfall hyetograph was obtained. Four types of statistical parameters, namely efficiency of the model (EFF), percentage defect in time to attain peak (PETP), percent defect in attained peak Q (PEP), percentage defect in runoff rate (PEV) are used to check model’s efficiency. The comparison is done between the findings of Clark and Nash GIUH models and the original Clark and Nash models. It was observed that GIUH models are equally good even when optimization is done for Clark and Nash model’s parameters. Since the results obtained from these models are more credible, so, these models can be used in ungauged catchments to estimate the hydrographs.

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11

Kim, Joo-Cheol, Kwansue Jung, and Dong Kug Jeong. "Geomorphological Approach to the Skewed Shape of Instantaneous Unit Hydrograph." Journal of the Korean Water Resources Association 48, no. 2 (February 28, 2015): 91–103. http://dx.doi.org/10.3741/jkwra.2015.48.2.91.

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12

Corradini, C., F. Melone, and V. P. Singh. "Some Remarks on the Use of GIUH in the Hydrological Practice." Hydrology Research 26, no. 4-5 (August 1, 1995): 297–312. http://dx.doi.org/10.2166/nh.1995.0017.

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The geomorphologic instantaneous unit hydrograph (GIUH) as a component of rainfall-runoff models directed to the determination of design hydrographs in ungaged basins is investigated. Specifically, we first performed a sensitivity analysis of the GIUH to errors in the basin lag estimated by commonly used empirical relationships involving basin area. Then, the details required in representing the geomorphologic features in the GIUH estimate for fixed basin lag, L, were examined. Real basins located in Central Italy were selected; they range in area from 12 km2 to 4,147 km2 and are characterized by a significant variability in the drainage channel density, D. It was found that given L a minimum detail was necessary in representing basin geomorphology. Further, the estimate of L through basin area led to large errors in computing design hydrographs for a few small basins. An explicit consideration of D is suggested in order to eliminate this shortcoming.

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13

Gehbrehiwot, Anghesom, and Dmitry Kozlov. "GIUH-Nash based runoff prediction for Debarwa catchment in Eritrea." E3S Web of Conferences 97 (2019): 05001. http://dx.doi.org/10.1051/e3sconf/20199705001.

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Correct assessment of river flow is necessary to resolve a wide range of problems in the management and use of water resources. Recently, research towards the use of geomorphologic instantaneous unit hydrograph (GIUH) coupled with other conceptual models approach for flood prediction from ungauged catchments has been intensified. Widespread accessibility to geographic information system and remotely sensed imagery which are powerful tools for acquiring model inputs is one possible reason. This study, therefore, aims at direct surface runoff (DSRO) prediction using the geomorphologic instantaneous unit hydrograph based Nash model (GIUH-Nash) from ungauged catchment. DEM obtained from Shuttle Radar Topography Mission (SRTM) having 30 m resolution is used to generate the catchment’s physiographic and geomorphologic characteristics with the help of quantum geographic information system (QGIS). Based on this information, the GIUH-Nash model is used to simulate DSRO for different storm events. A visual comparison of observed values to predicted values of the runoff hydrographs as well as statistical indices shows that DSRO could be predicted with reasonable accuracy provided complete understanding of the model development and it’s evaluation procedures are properly followed. In respect of this, some key aspects that affect the performance of the model have been suggested.

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14

Bhadra, A., N. Panigrahy, R. Singh, N. S. Raghuwanshi, B. C. Mal, and M. P. Tripathi. "Development of a geomorphological instantaneous unit hydrograph model for scantily gauged watersheds." Environmental Modelling & Software 23, no. 8 (August 2008): 1013–25. http://dx.doi.org/10.1016/j.envsoft.2007.08.008.

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15

Al-Wagdany, A. S., and A. R. Rao. "Correlation of the velocity parameter of three geomorphological instantaneous unit hydrograph models." Hydrological Processes 12, no. 4 (March 30, 1998): 651–59. http://dx.doi.org/10.1002/(sici)1099-1085(19980330)12:4<651::aid-hyp606>3.0.co;2-b.

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16

Kumar, Rakesh, C. Chatterjee, R. D. Singh, A. K. Lohani, and Sanjay Kumar. "Runoff estimation for an ungauged catchment using geomorphological instantaneous unit hydrograph (GIUH) models." Hydrological Processes 21, no. 14 (2007): 1829–40. http://dx.doi.org/10.1002/hyp.6318.

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17

Kumar, Jeetendra, R. Suresh, and Safi Hassan. "Development of geomorphological instantaneous unit hydrograph (GIUH) model for a new un-gauged watershed." International Journal of Agricultural Invention 2, no. 01 (June 30, 2017): 54–59. http://dx.doi.org/10.46492/ijai/2017.2.1.13.

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A geomorphological instantaneous unit hydrograph (GIUH) model was developed for a watershed of Damodar valley corporation, Hazaribagh, using Nash (1959) and Itrube (1982) methods to compute peak discharge (qpeak) and time to peak (tpeak). The model was calibrated and validated for five storm events, i.e. June 24-25 (1992), October 12-13 (1993), November 2-3 (1993), June 28 (1994) and August 6 (1996) by comparing their ordinates with the ordinates of instantaneous unit hydrograph (IUH). The GIUH was tested with absolute prediction errors (APE) of the ordinate of peak discharge. On comparison, it was found that, most of the GIUH models overestimated the runoff at initial stage, while underestimated at the latter stage in comparison to the IUHs, which was mainly due to consideration of const ant value of Ф-index, for computation of effective rainfall. The absolute prediction errors (APE) were computed to be 5.97, 18.09, 23.32, 9.64 and 7.52% of the ordinates of peak discharge for the storm events of June 24-25 (1992), October 12-13 (1993), November 2-3 (1993), June 28 (1994) and August 6 (1996) respectively.

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18

Choi, Yong-Joon, Joo-Cheol Kim, and Man-Ha Hwang. "The Impact of Characteristic Velocities Considering Geomorphological Dispersion on Shape of Instantaneous Unit Hydrograph." Journal of Korea Water Resources Association 43, no. 4 (April 30, 2010): 399–408. http://dx.doi.org/10.3741/jkwra.2010.43.4.399.

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19

Ellouze-Gargouri, Emna, and Zoubeida Bargaoui. "Runoff Estimation for an Ungauged Catchment Using Geomorphological Instantaneous Unit Hydrograph (GIUH) and Copulas." Water Resources Management 26, no. 6 (February 26, 2012): 1615–38. http://dx.doi.org/10.1007/s11269-012-9975-6.

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20

Martim de Moura, Maíra, Samuel Beskow, Fabrício da Silva Terra, Carlos Rogério de Mello, Zandra Almeida da Cunha, and Felício Cassalho. "Evaluation of geomorphological approaches combined with digital elevation models for the Nash's instantaneous unit hydrograph." Journal of South American Earth Sciences 107 (April 2021): 103153. http://dx.doi.org/10.1016/j.jsames.2020.103153.

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21

ŻELAZINSKI, JANUSZ. "Application of the geomorphological instantaneous unit hydrograph theory to development of forecasting models in Poland." Hydrological Sciences Journal 31, no. 2 (June 1986): 263–70. http://dx.doi.org/10.1080/02626668609491043.

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22

DA ROS, DIEGO, and MARCO BORGA. "USE OF DIGITAL ELEVATION MODEL DATA FOR THE DERIVATION OF THE GEOMORPHOLOGICAL INSTANTANEOUS UNIT HYDROGRAPH." Hydrological Processes 11, no. 1 (January 1997): 13–33. http://dx.doi.org/10.1002/(sici)1099-1085(199701)11:1<13::aid-hyp400>3.0.co;2-m.

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23

Andrieu, Hervé, Roger Moussa, and Pierre-Emmanuel Kirstetter. "The Event-specific Geomorphological Instantaneous Unit Hydrograph (E-GIUH): The basin hydrological response characteristic of a flood event." Journal of Hydrology 603 (December 2021): 127158. http://dx.doi.org/10.1016/j.jhydrol.2021.127158.

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24

Bamufleh, Sameer, Abdullah Al-Wagdany, Amro Elfeki, and Anis Chaabani. "Developing a geomorphological instantaneous unit hydrograph (GIUH) using equivalent Horton-Strahler ratios for flash flood predictions in arid regions." Geomatics, Natural Hazards and Risk 11, no. 1 (January 1, 2020): 1697–723. http://dx.doi.org/10.1080/19475705.2020.1811404.

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25

Akay, Hüseyin. "Mitigation of Scour Failure Risk of a River Bridge Located in an Ungauged Basin." Baltic Journal of Road and Bridge Engineering 16, no. 1 (March 9, 2021): 37–56. http://dx.doi.org/10.7250/bjrbe.2021-16.514.

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In this study, scour failure risk of the Çatalzeytin Bridge located in the Western Black Sea Basin, Turkey, was assessed for possible future flood events and appropriate scour countermeasures were considered based on economic and constructability considerations. Waterway adequacy in the spans of the bridge and scour criticality around bridge foundations considered for risk calculations in HYRISK were estimated by hydrological and hydraulic analyses of the watershed and stream. Since the watershed of the bridge is ungauged, geomorphological instantaneous unit hydrograph concept was adopted to estimate the peak discharges with various return periods to be used in hydraulic modelling. Monte Carlo simulation results indicated that most of the simulated peak discharges were in the 95% confidence interval. Hydraulic model results from HECRAS indicated that waterway adequacy and scour criticality were critical for discharges with 200 and 500-year return periods. Scour failure risk of the Çatalzeytin Bridge was classified as high and it was proposed to reduce the risk by constructing partially grouted riprap as the most feasible alternative that would consequently increase the expected lifespan of the bridge. Following this methodology, river bridges may be prioritized based on the risk analysis.

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26

Nguyen, Hong, Gunter Meon, and Van Nguyen. "Development of an Event-Based Water Quality Model for Sparsely Gauged Catchments." Sustainability 11, no. 6 (March 24, 2019): 1773. http://dx.doi.org/10.3390/su11061773.

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This paper describes an event-based water quality model for sparsely gauged catchments. The model was cultivated in a robust way to cope with practical issues, such as limited available data and error propagation. A simplified model structure and fewer input parameters are the most appealing features of this model. All model components are coupled and controlled within an Excel Spreadsheet Macro as an operational tool. Herein, the geomorphological instantaneous unit hydrograph (GIUH), the simplified process erosion and sedimentation component, the loading function, and the river routing from different existing modeling systems are adopted and linked together. Furthermore, an add-on Monte Carlo simulation tool is provided to deliver an uncertainty analysis for calibration of the output obtained from the model results. The model was successfully applied to simulate nutrient dynamics for small catchment scales during flood events in Vietnam. The success of the model application shows the ability of our model, which can adapt the model complexity to the data availability, i.e., the dominant processes in the system should be captured, whereas the minor processes may be neglected or treated in a less complex manner.

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Agrawal, Niraj Kumar, Anil Kumar Lohani, and N. K. Goel. "Physiographic Analysis of Tehri Dam Catchment and Development of GIUH Based Nash Model for Ungauged Rivers." Current World Environment 14, no. 2 (June 24, 2019): 215–30. http://dx.doi.org/10.12944/cwe.14.2.06.

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Advanced information about incoming flows is required for operation of a variety of hydraulic structures including multipurpose storage hydropower projects. Inflow forecasts are used for optimum power generation during non -monsoon season and operation of gates and spillways during the flood season. In order to develop an inflow forecasting system for a reservoir, it has been observed that many a times number of ungauged rivers directly falling into the reservoirs are not accounted for. Such is the case for the Tehri Reservoir, where 16 small rivers/tributaries which are directly contributing to Tehri reservoir are ungauged. In the present study an attempt has been made to carry out physiographic objective Tehri catchment and to develop Geomorphological Instantaneous Unit Hydrograph (GIUH) for ungauged rivers/tributaries directly falling into the reservoir. GIUH developed for the ungauged rivers can be used to simulate the runoff from all the 16 ungauged rivers. Combining these GIUH models with a hydrological model of the other gauged rivers of the Tehri Catchment in the form of a network model provides a complete rainfall-runoff model. Thus, this study provides a useful input for the development of inflow forecasting model for the Tehri Dam as the network model can be used as flood forecasting model.

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28

Shen, Xinyi, Yiwen Mei, and Emmanouil N. Anagnostou. "A Comprehensive Database of Flood Events in the Contiguous United States from 2002 to 2013." Bulletin of the American Meteorological Society 98, no. 7 (July 1, 2017): 1493–502. http://dx.doi.org/10.1175/bams-d-16-0125.1.

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Abstract Notwithstanding the rich record of hydrometric observations compiled by the U.S. Geological Survey (USGS) across the contiguous United States (CONUS), flood event catalogs are sparse and incomplete. Available databases or inventories are mostly survey- or report-based, impact oriented, or limited to flash floods. These data do not represent the full range of flood events occurring in CONUS in terms of geographical locations, severity, triggering weather, or basin morphometry. This study describes a comprehensive dataset consisting of more than half a million flood events extracted from 6,301 USGS flow records and radar-rainfall fields from 2002 to 2013, using the characteristic point method. The database features event duration; first- (mass center) and second- (spreading) order moments of both precipitation and flow, flow peak and percentile, event runoff coefficient, base flow, and information on the basin geomorphology. It can support flood modeling, geomorphological and geophysical impact studies, and instantaneous unit hydrograph and risk analyses, among other investigations. Preliminary data analysis conducted in this study shows that the spatial pattern of flood events affected by snowmelt correlates well with the mean annual snowfall accumulation pattern across CONUS, the basin morphometry affects the number of flood events and peak flows, and the concentration time and spreadness of the flood events can be related to the precipitation first- and second-order moments.

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van der Tak, Laurens D., and Rafael L. Bras. "Incorporating hillslope effects into the geomorphologic instantaneous unit hydrograph." Water Resources Research 26, no. 10 (October 1990): 2393–400. http://dx.doi.org/10.1029/wr026i010p02393.

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Peña, A., J. L. Ayuso, and J. V. Giráldez. "Incorporating topologic properties into the geomorphologic instantaneous unit hydrograph." Physics and Chemistry of the Earth, Part B: Hydrology, Oceans and Atmosphere 24, no. 1-2 (January 1999): 55–58. http://dx.doi.org/10.1016/s1464-1909(98)00011-2.

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31

Allam, Mohamed N., and Khaled S. Balkhair. "Case study evaluation of the geomorphologic instantaneous unit hydrograph." Water Resources Management 1, no. 4 (1987): 267–91. http://dx.doi.org/10.1007/bf00421880.

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32

Khaleghi, M. R., V. Gholami, J. Ghodusi, and H. Hosseini. "Efficiency of the geomorphologic instantaneous unit hydrograph method in flood hydrograph simulation." CATENA 87, no. 2 (November 2011): 163–71. http://dx.doi.org/10.1016/j.catena.2011.04.005.

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33

Piccolroaz, S., M. Di Lazzaro, A. Zarlenga, B. Majone, A. Bellin, and A. Fiori. "HydroSCAPE: a multi-scale framework for streamflow routing in large-scale hydrological models." Hydrology and Earth System Sciences Discussions 12, no. 9 (September 4, 2015): 9055–90. http://dx.doi.org/10.5194/hessd-12-9055-2015.

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Abstract. We present HydroSCAPE, a large scale hydrological model with an innovative streamflow routing scheme based on the Width Function Instantaneous Unit Hydrograph (WFIUH) theory, which is designed to facilitate coupling with weather forecasting and climate models. HydroSCAPE preserves geomorphological dispersion of the river network when dealing with horizontal hydrological fluxes, irrespective of the adopted grid size, which is typically inherited from the overlaying weather forecast or climate model. This is achieved through a separate treatment of hillslope processes and routing within the river network, with the latter simulated by suitable transfer functions constructed by applying the WFIUH theory to the desired level of detail. Transfer functions are constructed for each grid cell and nodes of the network where water discharge is desired by taking advantage of the detailed morphological information contained in the Digital Elevation Model of the zone of interest. These characteristics render HydroSCAPE well suited for multi-scale applications, ranging from catchment up to continental scale, and to investigate extreme events (e.g. floods) that require an accurate description of routing through the river network. The model enjoys reliability and robustness, united to parsimony in the adopted parametrization and computational efficiency, leading to a dramatic reduction of the computational effort with respect to full-gridded models at comparable level of accuracy of routing. Additionally, HydroSCAPE is designed with a simple and flexible modular structure, which makes it particularly suitable to massive parallelization, customization according to the specific user needs and preferences (e.g. choice of rainfall-runoff model), and continuous development and improvements.

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Javier, Julie Rose N., James A. Smith, Katherine L. Meierdiercks, Mary Lynn Baeck, and Andrew J. Miller. "Flash Flood Forecasting for Small Urban Watersheds in the Baltimore Metropolitan Region." Weather and Forecasting 22, no. 6 (December 1, 2007): 1331–44. http://dx.doi.org/10.1175/2007waf2006036.1.

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Abstract The utility of distributed hydrologic models in combination with high-resolution Weather Surveillance Radar-1988 Doppler (WSR-88D) rainfall estimates for flash flood forecasting in urban drainage basins is examined through model simulations of 10 flood events in the 14.3 km2 Dead Run watershed of Baltimore County, Maryland. The hydrologic model consists of a simple infiltration model and a geomorphological instantaneous unit hydrograph–based representation of hillslope and channel response. Analyses are based on high-resolution radar rainfall estimates from the Sterling, Virginia, WSR-88D and observations from a nested network of 6 stream gauges in the Dead Run watershed and a network of 17 rain gauge stations in Dead Run. For the three largest flood peaks in Dead Run, including the record flood on 7 July 2004, hydrologic model forecasts do not capture the pronounced attenuation of flood peaks. Hydraulic controls imposed by valley bottom constrictions associated with bridges and bridge abutments are a dominant element of the extreme flood response of small urban watersheds. Model analyses suggest that a major limitation on the accuracy of flash flood forecasting in urban watersheds is imposed by storm water management infrastructure. Model analyses also suggest that there is potential for improving model forecasts through the utilization of information on initial soil moisture storage. Errors in the rainfall field, especially those linked to bias correction, are the largest source of uncertainty in quantitative flash flood forecasting. Bias correction of radar rainfall estimates is an important element of flash flood forecasting systems.

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35

Ghumman, Abdul Razzaq, Muhammad Masood Ahmad, Hashim Nisar Hashmi, and Mumtaz Ahmad Kamal. "Development of geomorphologic instantaneous unit hydrograph for a large watershed." Environmental Monitoring and Assessment 184, no. 5 (June 29, 2011): 3153–63. http://dx.doi.org/10.1007/s10661-011-2179-3.

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Nguyen, H. Q., B. H. P. Maathuis, and T. H. M. Rientjes. "Catchment storm runoff modelling using the geomorphologic instantaneous unit hydrograph." Geocarto International 24, no. 5 (October 2009): 357–75. http://dx.doi.org/10.1080/10106040802677011.

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Piccolroaz, Sebastiano, Michele Di Lazzaro, Antonio Zarlenga, Bruno Majone, Alberto Bellin, and Aldo Fiori. "HYPERstream: a multi-scale framework for streamflow routing in large-scale hydrological model." Hydrology and Earth System Sciences 20, no. 5 (May 24, 2016): 2047–61. http://dx.doi.org/10.5194/hess-20-2047-2016.

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Abstract. We present HYPERstream, an innovative streamflow routing scheme based on the width function instantaneous unit hydrograph (WFIUH) theory, which is specifically designed to facilitate coupling with weather forecasting and climate models. The proposed routing scheme preserves geomorphological dispersion of the river network when dealing with horizontal hydrological fluxes, irrespective of the computational grid size inherited from the overlaying climate model providing the meteorological forcing. This is achieved by simulating routing within the river network through suitable transfer functions obtained by applying the WFIUH theory to the desired level of detail. The underlying principle is similar to the block-effective dispersion employed in groundwater hydrology, with the transfer functions used to represent the effect on streamflow of morphological heterogeneity at scales smaller than the computational grid. Transfer functions are constructed for each grid cell with respect to the nodes of the network where streamflow is simulated, by taking advantage of the detailed morphological information contained in the digital elevation model (DEM) of the zone of interest. These characteristics make HYPERstream well suited for multi-scale applications, ranging from catchment up to continental scale, and to investigate extreme events (e.g., floods) that require an accurate description of routing through the river network. The routing scheme enjoys parsimony in the adopted parametrization and computational efficiency, leading to a dramatic reduction of the computational effort with respect to full-gridded models at comparable level of accuracy. HYPERstream is designed with a simple and flexible modular structure that allows for the selection of any rainfall-runoff model to be coupled with the routing scheme and the choice of different hillslope processes to be represented, and it makes the framework particularly suitable to massive parallelization, customization according to the specific user needs and preferences, and continuous development and improvements.

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Jin, Chang-Xing. "A deterministic gamma-type geomorphologic instantaneous unit hydrograph based on path types." Water Resources Research 28, no. 2 (February 1992): 479–86. http://dx.doi.org/10.1029/91wr02577.

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Franchini, Marco, and P. Enda O'Connell. "An analysis of the dynamic component of the geomorphologic instantaneous unit hydrograph." Journal of Hydrology 175, no. 1-4 (February 1996): 407–28. http://dx.doi.org/10.1016/s0022-1694(96)80018-7.

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Monajemi, Parjang, Setareh Khaleghi, and Shahrzad Maleki. "Derivation of instantaneous unit hydrographs using linear reservoir models." Hydrology Research 52, no. 2 (February 5, 2021): 339–55. http://dx.doi.org/10.2166/nh.2021.171.

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Abstract In this research, a new conceptual model for producing instantaneous unit hydrographs (IUHs) is introduced by a linear combination of the Nash model, which assumes that the discharge from a reservoir is a linear function of its storage, and a model called inter-connected linear reservoir model (ICLRM), which assumes that the discharge from a reservoir is a linear function of the difference of its storage and its adjacent downstream reservoir. By employing these assumptions, a system of first-order linear differential equations with three degrees of freedom (storage coefficient, number of reservoirs, and weighting coefficient) is obtained as the governing equation for the proposed model. This model may be considered as the general form of the two models and is therefore capable of simulating IUHs laying between these two models. To show the capabilities of the model, linear and curvilinear soil conservation service (SCS) hydrographs are simulated using dimensionless hydrographs obtained by this model. Moreover, several real hydrographs were simulated by the proposed model and compared with hydrographs obtained by Nash, ICLRM, and SCS models. The results show that the model yields more accurate results compared to other studied models and may be considered as a new model for simulating IUHs.

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Bayati, Fatemeh, Rasoul Mirabbasi, Rouhallah Fatahi, and Mahdi Radfar. "The Study of the Effect of Some Used Parameters on Geomorphologic Instantaneous Unit Hydrograph." journal of watershed management research 10, no. 20 (December 1, 2019): 109–19. http://dx.doi.org/10.29252/jwmr.10.20.109.

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Kumar, Anil. "Geomorphologic Instantaneous Unit Hydrograph Based Hydrologic Response Models for Ungauged Hilly Watersheds in India." Water Resources Management 29, no. 3 (October 25, 2014): 863–83. http://dx.doi.org/10.1007/s11269-014-0848-z.

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Agnese, C., F. D'Asaro, and G. Giordano. "Estimation of the time scale of the geomorphologic instantaneous unit hydrograph from effective streamflow velocity." Water Resources Research 24, no. 7 (July 1988): 969–78. http://dx.doi.org/10.1029/wr024i007p00969.

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Hao, Fanghua, Mingze Sun, Xiaojun Geng, Weijia Huang, and Wei Ouyang. "Coupling the Xinanjiang model with geomorphologic instantaneous unit hydrograph for flood forecasting in northeast China." International Soil and Water Conservation Research 3, no. 1 (March 2015): 66–76. http://dx.doi.org/10.1016/j.iswcr.2015.03.004.

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Georgakakos, Aris P., and John C. Kabouris. "A streamflow model using physically-based instantaneous unit hydrographs." Journal of Hydrology 111, no. 1-4 (January 1989): 107–31. http://dx.doi.org/10.1016/0022-1694(89)90255-2.

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Moussa, Roger. "Effect of channel network topology, basin segmentation and rainfall spatial distribution on the geomorphologic instantaneous unit hydrograph transfer function." Hydrological Processes 22, no. 3 (2008): 395–419. http://dx.doi.org/10.1002/hyp.6612.

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Rajyalakshmi, N. V., and S. Dutta. "Regionalization of rainfall–runoff processes in rice agriculture dominated watersheds." Water Science and Technology 53, no. 10 (May 1, 2006): 131–39. http://dx.doi.org/10.2166/wst.2006.306.

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An approach for computing the instantaneous unit hydrograph of rice agriculture dominated watesheds is proposed using the topology and hydraulic charcterstics of its stream network and the hydrologic behaviour of the rice agriculture area. The effect of rice agriculture on the watershed response is considered as partial sink areas. The sink factor, a time-variant weight factor for a particular storm event, is computed from the daily water balanace equation of the rice field. The critcal features of the simulated instantaneous unit hydrographs in three gauged watersheds located in the river Mahanadi, India were then compared with that of the observed 24-hr unit hydrograph. The comparison shows a significant correlation between the two results.

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Yao, Cheng, Ke Zhang, Zhongbo Yu, Zhijia Li, and Qiaoling Li. "Improving the flood prediction capability of the Xinanjiang model in ungauged nested catchments by coupling it with the geomorphologic instantaneous unit hydrograph." Journal of Hydrology 517 (September 2014): 1035–48. http://dx.doi.org/10.1016/j.jhydrol.2014.06.037.

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HUNG, CHUN-PO. "GENERAL CODING METHOD ON RANDOM SELF-SIMILAR TREE COMPOSED OF MULTIPLE BASIC PATTERNS." Fractals 17, no. 03 (September 2009): 283–98. http://dx.doi.org/10.1142/s0218348x09004442.

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This work discusses the random self-similar tree generation by employing multiple basic patterns, and investigates the character code and standardization algorithm for multiple basic patterns. With reference to the wide range of various basic patterns in natural shapes, the general coding method and the corresponding algorithm to calculate the topological distance is developed for random self-similar tree with multiple basic patterns. To assess the adaptability of the process, the general coding method is applied to transfer the generated river network to a code series and the corresponding algorithm for calculating topological distance of the links is used to determine the width function of the pattern. Finally, the width-function based geomorphologic instantaneous unit hydrograph (WF-GIUH) model is then applied to estimate the runoff of the Po-bridge watershed in northern Taiwan. The results reveal that the random self-similar tree with multiple basic patterns proposed in this study can be implemented successfully to calculate hydrologic responses.

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Seo, Y., and S. Y. Park. "Prediction of direct runoff hydrographs utilizing stochastic network models: a case study in South Korea." Hydrology and Earth System Sciences Discussions 11, no. 10 (October 10, 2014): 11247–79. http://dx.doi.org/10.5194/hessd-11-11247-2014.

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Abstract. In this study, we combine stochastic network models that reproduce the actual width function and the width function based instantaneous unit hydrograph (WFIUH) that directly makes use of a width function and converts it into runoff hydrographs. We evaluated the stochastic network models in terms of reproducing the actual width function and also the robustness of the semi-distributed model (WFIUH) in application to a test watershed in South Korea. The stochastic network model has an advantage that it replicates width functions of actual river networks, whereas the WFIUH has an advantage that the parameter values are physically determined, which can be potentially advantageous in prediction of ungauged basins. This study demonstrates that the combination of the Gibbsian model and the WFIUH is able to reproduce runoff hydrographs not just for the case of uniform rainfall over the test catchment but also for moving storms. Therefore, results of this study indicate that the impact of spatial and temporal rainfall variation on runoff hydrographs can be evaluated by the suggested approach in ungauged basins even without detailed knowledge of river networks. Once the regional similarity in river network configuration is identified, the proposed approach can be potentially utilized to estimate the runoff hydrographs for ungauged basins.

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