摘要
地面沉降是当今城市化进程中不容忽视的环境地质问题,不但造成水利设施破坏、地下水质和地质环境恶化、标高损失等一系列问题,还会引发城市内涝和河道泄流能力降低,危及城乡防洪安全。选取沉降最严重的大清河系尾闾骨干防洪工程,通过建立一维河网和二维蓄滞洪区衔接数学模型,分别模拟计算地面沉降前1982年和沉降后2010年地形条件下50 a一遇洪水演进过程,利用特征点水力参数对比统计,分析近30 a地面沉降对区域防洪的影响。研究表明:地面沉降后行洪河道和蓄滞洪区水位明显降低,入海总水量减少,但河道堤防超高大幅减小,区域防洪风险大大增加。
Land subsidence is an environmental geological problem that cannot be ignored in the process of urbanization. It will cause a series problems such as water conservancy facilities destruction,underground water quality and geological environment deterioration,elevation loss,reducing urban flood control safety and so on. This paper selected the most serious land subsidence of the downstream of Daqing River,built a one-dimensional and two-dimensional flood storage and detention mathematical model and simulated the flood evolution process of 50-year flood in 1982 before subsidence and 2010 after subsidence. Based on the comparison of characteristic hydraulic parameters,the influence of land subsidence on regional flood control in the past 30 years was analyzed. The study shows that the river and flood water level have been decreased significantly,the total amount of water into the sea has been reduced,the freeboard of dykes has been decreased obviously and regional flood risk has been increased significantly after the ground subsidence.
作者
周志华
ZHOU Zhihua(Tianjin Water Conservancy Science Research Institute,Tianjin 300061,Chin)
出处
《人民黄河》
CAS
北大核心
2018年第6期43-48,共6页
Yellow River
基金
水利部公益性行业科研专项(201301069)
关键词
地面沉降
防洪能力
数值模拟
大清河系
land subsidence
flood control capacity
numerical simulation
Daqing River