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刘易庄, 蒋昌波, 向朝晖, 隆院男, 邓 斌, 汤小俊.洞庭湖地形变化对洪水过程的影响研究水资源与水工程学报[J].,2023,34(2):99-106
洞庭湖地形变化对洪水过程的影响研究
Influence of topographic changes of Dongting Lake on flood process
  
DOI:10.11705/j.issn.1672-643X.2023.02.12
中文关键词:  地形变化  洪水过程  洪峰水位  湖泊容积  洞庭湖
英文关键词:topographic change  flood process  flood peak water level  lake storage  Dongting Lake
基金项目:湖南省自然科学基金项目(2021JJ40589); 长沙市自然科学基金项目(kq2014103); 湖南省重大水利科技项目(XSKJ2021000-07); 南京水利科学研究院水文水资源与水利工程科学国家重点实验室开放基金项目(2020nkms04)
作者单位
刘易庄1,2,3, 蒋昌波1,2, 向朝晖4, 隆院男1,2, 邓 斌1,2, 汤小俊4 (1.长沙理工大学 水利与环境工程学院 湖南 长沙 410114 2.洞庭湖水环境治理与生态修复湖南省重点实验室 湖南 长沙 410114 3.南京水利科学研究院 水文水资源与水利工程科学国家重点实验室 江苏 南京 210098 4.湖南省洞庭湖水利事务中心, 湖南 长沙 410007) 
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中文摘要:
      为了更好地理解地形变化对湖泊洪水过程的影响,采用已构建的长江-洞庭湖二维水动力模型,在洞庭湖2003及2011年实测地形的基础上,以2003年型洪水为例,定量分析了湖泊地形变化对洞庭湖洪水过程的影响。结果表明:2003—2011年洞庭湖超过40%的区域地形下降值大于0.10 m,特别是湘江洪道,其深泓线地形高程平均下降了5.72 m。通过对2003年洪水过程模拟发现,相比于2003年,在2011年地形情况下,以“四水”来流为主导的洪水过程中,南洞庭湖内洪峰水位下降超过0.40 m,西洞庭湖内洪峰水位下降约0.20 m,东洞庭湖内仅在南部地形变化较大区域的水位变化明显;斗米咀-城陵矶河段水面坡降变缓,南洞庭湖内洪道水面坡降变陡。而对于以长江来流为主导的洪水过程,由于长江洪水位的顶托作用,洞庭湖内洪峰水位下降了0.15 m,斗米咀-城陵矶河段及南洞庭湖内水面坡降下降不明显。因此,2003—2011年洞庭湖地形变化对“四水”来流型洪水影响较大,湖盆下切导致湖容增大,可有效缓解洞庭湖内防洪形势,但对长江来流主导的洪水影响较小。研究结果可为洞庭湖内疏浚扩容等防洪工程的开展提供参考。
英文摘要:
      Based on the measured topography data of Dongting Lake in 2003 and 2011, a previous calibrated 2D hydrodynamic model was adopted to simulate the impact of lake topographic change on the flood process of Dongting Lake using the 2003 flood as an example. The results show that over 40% topography of the lake subsided more than 0.10 m, especially the Xiangjiang spillway, the topography of its talweg subsided by 5.72 m. According to the simulation of the 2003 flood process, when the flood process was dominated by the Four Rivers, the flood peak water level decreased by more than 0.40 and 0.20 m in the South and West Dongting Lake under the topographic condition of 2011 compared with that of 2003; but for the East Dongting Lake, the water level only decreased significantly in the southern area with large topographic changes. The water surface gradient decreased in the Doumizui-Chenglingji section, but increased in the spillway of the South Dongting Lake. For the flood process dominated by the inflow of the Yangtze River, the flood peak water level in Dongting Lake decreased by 0.15 m, and the water surface gradient changed little in the Doumizui-Chenglingji section and the South Dongting Lake, due to the jacking effect of the Yangtze River. Therefore, the topographic change in Dongting Lake from 2003 to 2011 has a great impact on the flood dominated by the inflow of the Four Rivers, which can effectively alleviate the flood control pressure in Dongting Lake because the entrenchment of the lake basin increased the storage capacity of the lake; however, it has little impact on the flood dominated by the inflow of the Yangtze River. The research results can provide a reference for the implementation of flood control measures such as dredging and capacity expansion in Dongting Lake.
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