The Influence of Desilting Engineering on Flood Control and Drainage in Tidal River Network Area and Study on Engineering Proposal
Abstract: As the eastern coastal areas in China are muddy, where the sea sand is rich, siltation problems in different degrees occur in most estuaries and tidal rivers upstream of these areas. It’s easy to make flow sections narrow, channel depth shallow and urban landscape discord as deposition occurs in rivers, which have a great impact on flood prevention, shipping and ecological environment. In this paper, Ningbo Sanjiang River (Fenghua River, Yaojiang River, and Yongjiang River) was selected as an example to study the characteristics of water and sediment, the fluvial process and the deposition mechanism of the river. For the purpose of flood prevention and drainage and city landscape, different dredging schemes were proposed by using watershed hydrological model to calculate the implementation effect of the fluvial process in different conditions. On the basis of comprehensive comparison, the desilting engineering schemes were determined and provided for Sanjiang River governance. The results show that the desilting engineering can reduce the duration of the high water level, and increase the displacement of main stream or drainage gate along the river, which have an improvement effect on flood drainage of the basin. At the same time, river siltation is inevitable after the desilting engineering implementation. Therefore, the desilting scheme should consider engineering benefit and siltation characteristics, and select the scheme which is favorable for flood prevention, drainage and city landscape with suitable scale. Studies on the characteristics of water and sediment, fluvial process, deposition reasons, governance measures and so on in tidal river reach can provide a reference for other similar tidal river network area’s river regulation.
文章引用: 赵淳逸 , 王 雷 , 余蝶双 (2015) 清淤工程对感潮河网地区防洪排涝的影响及工程方案研究。 水资源研究， 4， 193-199. doi: 10.12677/JWRR.2015.42023
 严文武. 宁波三江河道水沙特性及冲淤变化规律[J]. 水利水运工程学报, 2011, (4): 143-148. YAN Wenwu. Water and sediment characteristics and their scouring and silting law in the three Rivers of Ningbo. Journal of Water Resources of Water Transport Engineering, 2011, (4): 143-148.
 熊绍隆, 曽剑. 潮汐河口分类指针与河床演变特征研究[J]. 水利学报, 2008, 39(12): 1286-1295. XIONG Shaolong, ZENG Jian. Study on classification index and fluvial processes of tidal estuaries. Journal of Hydraulic En-gineering, 2008, 39(12): 1286-1295.