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Relevant bibliographies by topics / Geomorphological Instantaneous Unit Hydrographs

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Academic literature on the topic 'Geomorphological Instantaneous Unit Hydrographs'

Author: Grafiati

Published: 6 September 2023

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Journal articles on the topic "Geomorphological Instantaneous Unit Hydrographs"

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 (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 (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 (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 (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 (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 (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 (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 (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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