Regional analysis using the Geomorphologic Instantaneous Unit Hydrograph (GIUH) method

Abstract

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.

The importance of calibration parameters on the accuracy of the floods description in the Snyder’s model

“…Unfortunately, in many streams are ungauged and do not have flow records. Even when stream gauges are in place, the record is often too short to accurately predict extreme events [KHALEGHI et al 2014]. In this case, for the estimation of design floods and volumes, often, event-based hydrological models are applied.…”

Comparison of hybrid regression and multivariate regression in the regional flood frequency analysis: A case study in Khorasan Razavi province

“…This natural phenomenon has been converted to a continuous phenomenon that can destroy capital and financial facilities of countries. Flood management in a basin will not be successful unless the hydrological behaviors of catchments are predicted (1)(2)(3)(4). Hence, the determination of flood peak discharge with different return periods is essential for conducting flood control plans, designing hydraulic structures, preventing erosion and designing storages in an area (5)(6)(7)(8).…”

Investigation of application of storm runoff harvesting system using geographic information systems (GIS): a case study of the Arak watershed, Markazi (Iran)

“…Unfortunately, current water use already in Iran exceeds renewable supply remarkably, and thus, it is necessary to find various and alternative sources of water to increase the sources of water supply, such as RWHSs (rainwater that falls onto rooftop of buildings and is collected directly into a rain storage tank) that is the most directly accessible water resources (Jones and Hunt 2010;Khaleghi and Varvani 2018a, b). Thus, scientific planning and management are needed to use rainwater efficiently (Khaleghi et al 2011;Youn et al 2012;Khaleghi et al 2014). The watershed management approach is as a fundamental principle in the ecology of the ecosystem which takes into account to make a relationship between basic and applied sciences.…”