基于脆弱性曲线的寿溪河流域村镇建筑洪灾风险评估

Flood Risk Assessment of Rural Buildings in Shouxihe Basin Based on Vulnerability Curve

摘要:

以寿溪河流域的村镇建筑为研究对象，采用MIKE FLOOD耦合水动力模型计算洪水淹没特征，结合结构静力学原理与洪水冲击荷载经验公式，建立村镇建筑的洪灾脆弱性曲线，开展洪灾风险评估。结果表明，寿溪河流域洪水淹没范围呈狭长的条状，洪水流速较大。低重现期下房屋以中低风险为主，高重现期下高风险与极高风险房屋主要分布在洪水发生点、洪水淹没区以及河坝村附近。建立的脆弱性曲线考虑了洪水流速的影响，能较好地刻画村镇建筑的结构损伤程度。

Abstract:

Rural buildings in Shouxihe Basin （SXHB） were taken as studied objects. Based on MIKE FLOOD coupled hydrodynamic model， the temporal and spatial distribution characteristics of inundation in SXHB were simulated and analyzed. Then， the vulnerability curve of rural buildings on flood risk was established from the theory of structural static mechanics and the empirical equation of flood load. Finally， the flood risk assessment of rural buildings in SXHB was conducted based on the results of hydrodynamic model and vulnerability curve. It is found that the inundated area is long， narrow， and with a large value of flow velocity. The buildings are majorly at low or middle risk in low return periods， whereas in high return periods buildings at high or extremely high risk locate nearby the dam-break， in the major inundated area， and at Heba Village. Flow velocity is considered as a parameter in the vulnerability curve which reflects the damage degree of rural buildings.