ISSN 1000-0526
CN 11-2282/P
CN 11-2282/P
Topography-based dynamic critical arearainfall threshold for small to middle-sized river flood warning
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Abstract:
Aim to solve flood warning of the ungauged and small to middle-sized basin, the topography-based dynamic critical arearainfall threshold model is developed for solving flood warning of the ungauged and small to middle-sized basin in this paper. The exponential equation model between dynamic critical arearainfall threshold and four main characteristic factors is established. Four main characteristic factors include basin area, channel slope, land use and soil type, which taking main effect on flood generation process in small to middle-sized basin. Dynamic critical arearainfall threshold in the ungauged basin is calculated with the developed exponential equation model of the gauged basins and four main characteristic factors of the ungauged basin. Five small to medium-sized basins in the subtropical monsoon climate region of eastern China are selected as the test basins, including Huangchuan basin of Huaihe River, Tunxi and Yuliang basins of Qiantang River, Xitiaoxi and nantiaoxi basins of Taihu Lake. Taking the warning flood as an example, dynamic critical arearainfall thresholds of Huangchuan, Yuliang, Xitiaoxi and nantiaoxi basins are inversed with the long-term hydrological and meteorological data by the GMKHM hydrological distributed model. According to the developed critical threshold model, dynamic critical arearainfall threshold of Tunxi basin is calculated basing on basin area, channel slope, land use and soil type. The topography-based dynamic critical arearainfall threshold is applied to flood warning verification of 35 representative flood events in Tunxi basin. Results show that flood warning hit rate basing on the topography-based dynamic critical arearainfall threshold is 91.4%，Which is close to that taking the basis on dynamic critical arearainfall threshold calculating with long-term hydrological and meteorological data in Tunxi basin. The developed topography-based dynamic critical arearainfall threshold model has certain reference significance for similar flood warning of ungauged basins and flash flood warning.
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