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| 暴雨山洪与山坪塘漫坝多灾害耦合风险分析 |
| Multi hazard coupling risk analysis of rainstorm mountain flood and Shanpingtang dam break |
| 投稿时间：2023-07-13 修订日期：2023-07-13 |
| DOI： |
| 中文关键词: HEC-RAS 暴雨山洪 山坪塘漫坝 多灾害耦合 |
| 英文关键词: HEC-RAS Rainstorm and mountain torrent overtopping dam Multi disaster coupling |
| 基金项目:国家自然科学基金委员会“加筋高堆细粒尾矿坝漫坝破坏宏细观力学特性及其行为预测模型研究”(51974051)；中国职业安全健康协会“极端气候下长历时暴雨型滑坡群灾害智能预警研究”(CXCY-2021-19)；重庆科技学院研究生创新计划项目“基于HEC暴雨山洪与山坪塘溃决灾害耦合风险分析”(YKJCX2220708)。 |
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| 中文摘要: |
| 为研究强降雨下山洪与漫坝耦合灾害对下游居民的影响程度和范围,基于HEC-RAS软件建立暴雨山洪-山坪塘漫坝多灾害耦合模型。首先,以重庆市巴南区某山坪塘为研究对象,根据城乡建设委员会发布的暴雨强度公式,设计出多种不同重现期下暴雨雨型。其次,借助数字高程数据对山坪塘进行了原始构建,采用参数化模型对溃坝楔口参数进行预测并结合物理溃坝机制模拟漫坝掏蚀过程。最后,根据深度、流速和滞留时间三个评价指标进行洪水风险分析。研究结果表明：在突发强降雨下,山洪形成迅速且山坪塘发生漫坝机率极大；山坪塘漫坝后加重附近区域的洪水风险等级,叠加淹没面积约在5.87-6.14万平分米,水深约再增加0.43-0.91米。研究结果可为多灾种防灾减灾以及洪水风险防范工作提供参考。 |
| 英文摘要: |
| In order to study the impact degree and scope of coupling disasters of mountain flood and overtopping dam on downstream residents under heavy rainfall, a coupling model of rainstorm mountain flood and overtopping dam was established based on HEC-RAS software. First of all, taking a Shanpingtang in Banan District of Chongqing as the research object, according to the rainstorm intensity formula issued by the Urban and Rural Construction Commission, a variety of rainstorm rain patterns with different Return period were designed. Secondly, the original construction of the Pond was carried out using digital elevation data. A parameterized model was used to predict the parameters of the dam breach wedge, and the physical dam breach mechanism was combined to simulate the erosion process of the overtopping dam. Finally, flood risk analysis is conducted based on three evaluation indicators: depth, flow velocity, and retention time. The research results indicate that under sudden heavy rainfall, flash floods form rapidly and the probability of dam overflow in mountain flat ponds is extremely high; After the overflow of the the dam, the flood risk level in the nearby area is increased, with a superimposed inundation area of approximately 58700-61400 m2 and a water depth increase of approximately 0.43-0.91 m. The research results can provide reference for the prevention and reduction of multiple disasters and flood risk prevention work. |
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