Abstract
Abstract. Shigu creek is a highly urbanized small watershed in Dongguan City. Due to rapid urbanization, quick flood response has been observed, which posted great threat to the flood security of Dongguan City. To evaluate the impact of urbanization on the flood changes of Shigu creek is very important for the flood mitigation of Shigu creek, which will provide insight for flood planners and managers for if to build a larger flood mitigation system. In this paper, the Land cover/use changes of Shigu creek from 1987–2015 induced by urbanization was first extracted from a local database, then, the Liuxihe model, a physically based distributed hydrological model, is employed to simulate the flood processes impacted by urbanization. Precipitation of 3 storms was used for flood processes simulation. The results show that the runoff coefficient and peak flow have increased sharply.
Highlights
Flooding is the natural disaster that has caused the most damages to the world
The Pearl River Delta Area (PRDA) in southern China is in the monsoon area, where heavy storms in the summer are observed very often, and flooding is the most frequent natural disaster threatening the safety of the local society
Purpose of this study is to evaluate the impact of urbanization (LUC change) on flood peak flow and flood runoff coefficient on the typical watershed, the Shigu creek, so to provide scientific base for smart flood measurement planning and building in Dongguan City
Summary
Flooding is the natural disaster that has caused the most damages to the world. The Pearl River Delta Area (PRDA) in southern China is in the monsoon area, where heavy storms in the summer are observed very often, and flooding is the most frequent natural disaster threatening the safety of the local society. Purpose of this study is to evaluate the impact of urbanization (LUC change) on flood peak flow and flood runoff coefficient on the typical watershed, the Shigu creek, so to provide scientific base for smart flood measurement planning and building in Dongguan City. With the development of satellite remote sensing, large quantities of the watershed terrain data was prepared and could be used for hydrological model setting up, providing opportunity for distributed hydrological model. The Liuxihe model (Chen et al, 2010), a physically based distributed hydrological model is employed to simulate the flood processes of Shigu creek in Dongguan City, which is a highly urbanized small watershed that is a very typical watershed in Dongguan City
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