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[1]YAN Sijia,CHAO Yunshu,PAN Hui,et al.Process Dynamic Analysis and Risk Assessment of Rainfall and Flood in Yongchun County Based on the Source-Sink Landscape[J].Research of Soil and Water Conservation,2023,30(04):286-292.[doi:10.13869/j.cnki.rswc.2023.04.047.]

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Process Dynamic Analysis and Risk Assessment of Rainfall and Flood in Yongchun County Based on the Source-Sink Landscape

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 30 Number of periods: 2023 04 Page number: 286-292 Column: Public date: 2023-06-10

Title:: Process Dynamic Analysis and Risk Assessment of Rainfall and Flood in Yongchun County Based on the Source-Sink Landscape

Author(s):: YAN Sijia^1,2, CHAO Yunshu^1,2, PAN Hui^1,2, ZHAO Jiawen^1,2, WU liyun^1,2; (1.College of Forestry, Fujian Agriculture and Forestry University, Fuzhou 350002, China; 2.Fujian Southern Forest Resources and Environmental Engineering Technology Research Center, Fuzhou 350002, China)

Keywords:: rain flood process; source-sink landscape; minimum cumulative resistance model; Yongchun County

CLC:: X443

DOI:: 10.13869/j.cnki.rswc.2023.04.047.

Abstract:: [Objective] The spatio-temporal dynamic evolution characteristics of the source-sink landscape under different rainfall return periods in the process of rainfall and flood was explored, and the distribution pattern of rainfall and flood disasters was generated, so as to provide scientific reference for the source-sink landscape unit planning and regional rainfall and flood disaster prevention. [Methods] Based on the landscape factor index data of Yongchun County, the landscape source-sink theory that can reflect the relationship between pattern and process was introduced. Based on the minimum cumulative resistance model, the source sink landscape was redefined from the perspective of the balance between landscape factor resistance and runoff dynamics. [Results] The overall characteristics of the initial source landscape space of Yongchun County were the highest in the central region, high in the west, low in the east, which concentrated near the Dai yun Mountains, and was easy to become the source of the runoff of the mountain. Under the state of natural drainage, Yongchun County was easily converted into the source landscape land use type sorting: grassland>cultivated land>construction land>forest land>unused land; grassland always had a strong source effect. The source effect of cultivated land was enhanced after the rainfall return period was greater than 10 years. The construction land and forest land had better ability to absorb rainwater when the rainfall return period was less than 20 years. After 20 years, the source function of the construction land was stronger, while the sink function of the forest land was stronger. The source function of the unused land was almost unchanged, and its ability to absorb rainwater needs to be verified later. When the return period of rainfall is 100 years, the risk of rain and flood disasters in the northwest of Yongchun was relatively high. High risk areas mainly concentrated in Yidu Town, Guiyang Town and Dongguan Town, which need to focus on disaster prevention. [Conclusion] The rain flood disaster in Yongchun County is affected by the mountain runoff in the northwest. In the future, it should be further studied from the perspective of reducing the source landscape and increasing the sink landscape.

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Last Update: 2023-06-10