A hydro-geomorphologic assessment of flood generation potentiality in ungauged sub-basins and their prioritization based on traditional, statistical, MCDM and Nash-GIUH models of a tropical plateau-fringe River
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引用次数: 0
Abstract
In ungauged sub-basins (SBs), estimation of peak flow (qp) is inevitable in designing both structural and non-structural flood mitigating measures to control outflow into the Master River. However, the inadequacy of stream flow data is the pivotal challenge in estimating qp and design flood in ungauged SBs. Therefore, an alternative basin prioritization approach is adopted for flood mitigation and sustainable development of ten tributary SBs of the Shilabati River which is one of the most flood-prone tropical plateau fringe river basins in eastern India. Significant morphometric and hydrologic parameters are used for SB prioritization in terms of five different flood generation potentiality (FGP) models, namely compound factor, hazard degree, principal component analysis, weighted sum analysis and analytical hierarchy process (AHP). Results of the FGP models are compared with the qp of the Geomorphologic Instantaneous Unit hydrograph (GIUH) model linked with the Nash two-parameter gamma distribution function. Among a total of five Nash-GIUH models, the GIUHavg model (Nash-GIUH based on average dynamic velocity) is used to evaluate the FGP models. Results imply that AHP-FGP is the most efficient model for SB prioritization. According to AHP scores, the highest priority for flood mitigation is given to SB-6 due to its high FGP value followed by SB-3, and SB-4. Similarly, the highest qp (0.106 hr-1) and shortest time to peak (tp) (4.718 hrs) of GIUHavg are observed in SB-6, representing the hazardous nature of the SB. Morpho-hydrologic parameters such as time of concentration (Tc), relative relief (Rr) and hypsometric integral (HI) are identified as significant for the AHP-FGP model. In addition, moderate-strong correlations of Tc, Rr and HI with the qp of GIUHavg exhibit the association between geomorphologic characteristics and hydrologic behaviour of SBs. Therefore, this study presents an integrated approach of FGP and GIUH-based flood hazard assessment for sub-basin prioritization that will help to develop valuable insights to reduce the formation of quick qp in ungauged SBs that can trigger flooding in the Master River.
期刊介绍:
The Journal of Hydrology publishes original research papers and comprehensive reviews in all the subfields of the hydrological sciences including water based management and policy issues that impact on economics and society. These comprise, but are not limited to the physical, chemical, biogeochemical, stochastic and systems aspects of surface and groundwater hydrology, hydrometeorology and hydrogeology. Relevant topics incorporating the insights and methodologies of disciplines such as climatology, water resource systems, hydraulics, agrohydrology, geomorphology, soil science, instrumentation and remote sensing, civil and environmental engineering are included. Social science perspectives on hydrological problems such as resource and ecological economics, environmental sociology, psychology and behavioural science, management and policy analysis are also invited. Multi-and interdisciplinary analyses of hydrological problems are within scope. The science published in the Journal of Hydrology is relevant to catchment scales rather than exclusively to a local scale or site.