Watershed model-based flash flood disaster monitoring and early warning system
JING Shuangyi1, WANG Zejun1, LI Weiping1, XIN Mingliang1, REN Bo2, HUANG Lizhi2
1.School of Energy and Environment, Inner Mongolia University of Science & Technology, Baotou, Inner Mongolia 014010, China; 2. Datong City Hydrology and Water Resources Investigation Bureau, Datong, Shanxi 037300, China
Abstract：A flash flood disaster monitoring and early warning system was proposed in the paper based on watershed model to improve the accuracy and timeliness of the current system in use so as to minimize residents′ personal injury and private property damage in mountain areas. At first, the system design principle, construction purpose, and basic modelling method were introduced according to the requirements of national water conservancy administration on informatization construction, flash flood disaster prevention and control. Since the rainfall threshold was one key factor in the system, the problems in three existing common methods for determining the threshold, i.e. single station rainfall, regional rainfall, and P-III frequency hydrological curve estimation, were analyzed. Then a watershed rainfall-based method was put forward to decide the rainfall threshold. Finally, a watershed model-based flash flood disaster monitoring and early warning system was developed. The system was used to determine the rainfall thresholds in different periods with different water-holding capacities in some riverside villages in Datong County of Shanxi Province, and estimated thresholds were compared with the measured values. Results indicated that the measured rainfall thresholds were in between the thresholds in high-water-content and low-water-content soils, suggesting the method was feasible. The built watershed-based flash flood disaster monitoring and early warning system for Datong County has promoted mountain flash flood disaster prevention and control work in Datong.
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