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［ 23］ 任洪玉，肖翔，陈小平，等 . 山洪灾害防治与水土保持相互联系探讨［J］. 长江科学院院报，2015，32（3）：
73-76 .

The impact of ecological environment change on flash flood
of the upper reaches of Minjiang River

LI Qing 1，2 ，SUN Dongya 1，2 ，LIU Ronghua 1，2 ，LI Changzhi 1，2 ，LIU Yun 1，2
（1. China Institute of Water Resources and Hydropower Research，Beijing 100038，China；
2. Research Center on Flood & Drought Disaster Reduction of the Ministry of Water Resources，Beijing 100038，China）

Abstract： Flash flood disaster-prone areas are generally located in ecologically fragile and sensitive areas
in the upper reaches of rivers, and soil erosion and ecological degradation have exacerbated the severity of
disasters. This paper screens the upper reaches of the Minjiang River as the research area, focusing on the
coupling relationship between ecological environment changes and flash flood. Combining background data,
that is, the classification results of the upper Minjiang River ecosystem in 2013, GIS technology was used
to simulate the three ecological optimal scenarios and ecological degradation scenarios of returning farmland
to forests, mine restoration, and ecological enclosure. The HEC-HMS model was employed to calculate the
flood process under different ecological scenarios by design rainstorm data, and then the changes in the
flash flood process were analyzed under ecological optimization and degradation conditions. Results reveal
that: the optimization of ecological types has a significant effect on flood peak reduction and delay time,
which is manifested in the reduction of flood peak and flood concentration, weakened impact, and being
less prone to disasters. When ecological conditions are degraded, flood peak discharge increases and peak
discharge appears earlier. Therefore, both improving the ecological environment and regulating runoff capaci⁃
ty in disaster-prone areas, can effectively enhance the ability to prevent flash flood. It is of great signifi⁃
cance for reducing flash flood losses.
Keywords： ecological change； flood process； flash flood； scene simulation； the upper reaches of Minjiang
River

（责任编辑：王学凤）

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