| Huaihe River is an important part of China’s planned Beijing-Hangzhou CanalHuaihe water transport channel,due to the change of upstream water and sand and the influence of man-made river sand mining,coupled with the lack of necessary maintenance,the channel conditions are deteriorating day by day,the Huaihe River Basin to Sanhejian section has appeared many beach risks,including a number of beach risks,multiple types of beach types composed of complex beach groups,compared with a single beach section,the beach group of beach risk density is large,the continuous distance is long,the navigation is serious,the beach risk characteristics are complex and have complex boundary conditions.Wuzhaitan～Steep River along the beach is one of the key navigable beach hazard groups in the section from Huaibin to Sanhejian River of the Huaihe River,which coexists in three beach risks,namely Wuzhai Beach,Cuiji Beach and Steep River Beach,which seriously affects the navigation safety of the channel.Therefore,the study of the rectification plan along the Wuzhaitan～steep river is of great practical significance for maintaining the smooth flow of waterways and the safety of ships.In this thesis,relying on the Huaihe River Huaibin to Sanhejian channel improvement project,this thesis establishes a mathematical model of water and sand in the main beach section from Wuzhai Beach to Steep River,studies the water flow conditions of each beach section after different schemes of remediation,and predicts the distribution of sediment and sediment erosion along the Wuzhai to Steep River after 20 years and its impact on the channel.The main research contents and conclusions are as follows:(1)According to the collected measured terrain data and related hydrological data,the model was verified,and the verification results showed that the water level and terrain erosion deviation were within the allowable range of the specification,and the model could better simulate and study the water movement of the river section,which could be used to study the effect of the remediation plan.(2)According to the evolution law of riverbed,the cause of beach risk and the characteristics of navigation obstruction in the engineering river section,some important parameters in the channel remediation were determined by analyzing the relevant hydrological data,and three remediation schemes were proposed,and the water flow characteristics of each beach section under the three remediation schemes were analyzed and studied through mathematical models.(3)The study shows that the remediation measures combining dredging and arranging the beach protection belt in the third scheme can better improve the water flow conditions in the main navigation channel of each beach section than the other two schemes,so that the flow rate of the main navigation tank in the dry period is greatly improved,the flow pattern problems at the entrance and exit of Cuiji Zuoban and the steep river along the bend are effectively improved,the water binding effect is better,and it is conducive to slowing down the siltation of the river channel in the dry period and can better stabilize the side beach,and the remediation effect is more ideal.According to the selected series of water and sand years,the total amount of sediment silt distribution and siltation in the section from Wuzhai to Steep River after 20 years of remediation in each scheme was predicted,and the impact of sediment flushing on the channel after the remediation of each beach section under different schemes was analyzed.The results show that the maximum siltation thickness is 0.63～0.68 m,the average siltation thickness is 0.21～0.23 m,and the maximum siltation is not within the scope of the trough,and the sediment siltation has little impact on the navigation channel after 20 years of remediation. |
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