洞庭湖烂泥湖水系洪涝灾害风险评估与应对措施

Assessing Waterlogging Risk of Lanni Lake Water System in Dongting Lake District,Hunan Province

近年来,洪涝灾害是全球发生频繁、危害最严重的气象灾害之一,国内不少学者开始对洪涝灾害进行研究,目前对于洞庭湖区洪涝灾害风险的研究较少。采用综合评价法建立模型对洞庭湖区烂泥湖水系洪涝灾害风险进行评估并提出应对策略,结果表明:新泉寺闸内水位和滞涝水面率的不同导致暴雨对烂泥湖水系的影响程度也不同。同时采取提高滞涝水面率和降低内湖水位,基本可以消除一般年份处于高风险的范围,对于减少低风险范围、增加无风险范围效果更为显著;对于平均风险度为高风险的年份,能够消除大部分高风险区域。

In recent years,flood disasters are one of the most frequent and most severe meteorological disasters in the world.Many domestic scholars are beginning to study flood disasters,but there is currently little research on flood disaster risk in Dongting Lake District.A comprehensive evaluation method is used to establish a model to evaluate the flood disaster risk of Lanni Lake water system in Dongting Lake Area and propose countermeasures.The results show that under different internal water levels of Xinquansi Sluice,different rainstorm intensities have different impacts on the flood disasters of the Lanni Lake water system.At the same time,raising the waterlogging surface rate and lowering the water level of the inner lake can basically eliminate the high-risk range in ordinary years,which is more significant to reducing the low-risk areas and increasing the non-risk areas,and reducing most high-risk areas for years with a high average risk.