极端降雨条件下淤地坝系溃决损失计算方法

doi:10.16843/j.sswc.2023118

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Abstract [Background] In recent years, due to the poor service condition and frequent extreme rainfall weather during flood season, the check dams are in the risk of breach while bringing comprehensive benefits, which causes a great threat to the life and property of downstream people and the protection of the ecological environment. Therefore, it is urgent to propose a quantitative calculation method for the loss from check dam system breach under extreme rainfall conditions. [Methods] This study was based on the FT-IWHR program for the risk analysis of dam system failure using the "Genealogy Method", the DB-IWHR program for dam breach flow calculation, and the one-dimensional flood routing calculation program. It proposed a comprehensive calculation method for the entire process of check dam system failure and subsequent flood routing. By integrating the Li-Zhou method for estimating life loss, it constructed a calculation methodology for assessing the impact of dam breach that encompasses life loss, economic loss, and social-environmental impact. [Results] Based on the calculating method system proposed in this study, an application study was carried out on the check dam system in Xiwuselang basin. The results show that the warning time has a great impact on the number of life loss. Under full warning and no warning, the number of life loss is about 10 times different, and the loss increases sharply after the rainfall exceeds 100-year return period. This dam system is mainly breached by small and medium-sized check dam. [Conclusions] The proposed calculation method for breach loss can achieve rapid quantitative evaluation of the loss from check dam system breach, and provide technical support for the safe operation of check dams and reinforcement of dangerous dams. It is suggested that the Xiwuselang basin should do a good work in preventing and controlling the risk of small-and medium-sized check dam breach.

Key words： check dam breach life loss economic loss social-environmental impact

Received: 11 August 2023

PACS:	TV122+.4
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	Articles by authors
	ZHOU Heng
	CHEN Yongsheng
	CAO Yongxiang
	YU Shu
	XIA Zhaohui
	YUE Fan

Cite this article:

ZHOU Heng,CHEN Yongsheng,CAO Yongxiang, et al. A loss evaluation method for overtopping-induced failure of clustered check dams under extreme rainfall conditions[J]. SSWC, 2024, 22(4): 14-24.

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http://journal12.magtechjournal.com/Jweb_stbc/EN/10.16843/j.sswc.2023118 OR http://journal12.magtechjournal.com/Jweb_stbc/EN/Y2024/V22/I4/14

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