Abstract
Based on the meteorological and geographic information data, with statistical method and the FloodArea model, the extreme daily rainfall of the 100-year return period in Hunhe River basin was established, through the simulation of rainstorm and flood disaster, characteristics of flood depth in warning spot Cangshi village in the upstream of the river were analysed, and possible effect on community economy was also evaluated. Results showed that, the precipitation of 100-year return period occurred, the flood depth has been below 1.0 meter in the most areas of Hunhe River basin, the depth was between 1.0 meter and 2.5 meters in the part areas of Hunhe River basin, and the flood depth has been exceed 2.5 meters in a small part of Hunhe River basin. After the beginning of precipitation, the flood was concentrated in the upper reaches of the river. With the accumulation of precipitation and the passage of time, the flood pools into midstream and downstream. Precipitation lasted for 24 hours, the warning spot was flooded in the beginning of precipitation. With the accumulation of precipitation, water level of the river increases gradually. The depth of warning spot has passed 1.0 meter at the 07 time of the whole process, and the maximum value of flood depth at warning spot was 1.083 meters that occurred at the 19 time. The flood depth of warning spot decreased gradually after the precipitation stopping, and the depth has been below 0.2 meters, the flood of upstream ended. Up to the end of the upstream flood process, in the whole river, about one million five hundred and sixty thousand people were affected by flooding, and thirty-eight billion and two hundred million RMB of gross domestic product were lost, in addition, dry land and paddy field were affected greatly, but woodland and grassland were less affected.
Highlights
The Hunhe River is a tributary of the left bank of the Liao River and is one of the major rivers in Liaoning Province [1]
The precipitation of 100-year return period occurred, the flood depth has been below 1.0 meter in the most areas of Hunhe River basin, the depth was between 1.0 meter and 2.5 meters in the part areas of Hunhe River basin, and the flood depth has been exceed 2.5 meters in a small part of Hunhe River basin
This paper aims to establish the Annual Maximum (AM) based on the observed data in the Hunhe River Basin and to fit this distribution by four kinds of 47 kinds of distribution functions Precipitation series, get the maximum daily precipitation intensity in the once-in-a-hundred-year recurrence period
Summary
The Hunhe River is a tributary of the left bank of the Liao River and is one of the major rivers in Liaoning Province [1]. The calculation is based on the hydrodynamic method [16] It operates as a module in ArGIS and uses the spatial analysis function to fully integrate with the ArGIS desktop graphical user interface. It simulates the evolution of floods in grid units. Based on the DEM and precipitation data in the Hunhe River Basin, this study used model rainstorm model to simulate the submergence caused by heavy rainfall in the Hunhe River basin Scenario simulation, according to the process of submergence of the river basin, the trend of submerged depth change is calculated, and the social and economic impact of submergence on the submerged field is evaluated
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