Sensitivity Analysis of Parameters of a HEC-HMS Model with Polders

Abstract

Gao, Y.; Zhang, Z., and Liu, Y., 2019. Sensitivity analysis of parameters of a HEC-HMS model with polders. In: Guido-Aldana, P.A. and Mulahasan, S. (eds.), Advances in Water Resources and Exploration. Journal of Coastal Research, Special Issue No. 93, pp. 163–169. Coconut Creek (Florida), ISSN 0749-0208.The imperviousness percentage, polder allowable water depth, and drainage modulus are the main features that determine the effectiveness and efficiency of flood control with polders. This study is aimed to examine the impact of impervious percentage, polder allowable water depth, and drainage modulus on peak flow and flood volume for simulating flood processes. A Hydrologic Engineering Center-Hydrologic Modelling System (HEC-HMS) model is developed to simulate flood control with polders in order to explore the impact of these impervious percentage, polder allowable water depth, and drainage modulus. The Qinhuai River Basin is employed as the research area as it is a typical watershed that uses polders for flood control. The results demonstrate that the flood volume and peak flow increase with the impervious percentage increases from 20% to 70%. When the polder allowable water depth increases, the flood volume decreases but the peak flow increases. With the decrease of drainage modulus, the peak flow and flood volume decrease. This study provides a reference and guidance to simulate flood control with polders and the impact of the three features in the Qinhuai River Basin. In addition, it could be easily adopted for other basins with polder.