The Research And Application Of Mathematical Sedimentation Model For DuLiuJianhe River Estuary

In the north of China, it is a widespread phenomenon, after constructing the tidegate at the estuary, the decrease of discharge runoff leads to the aggradations afterthe gate. It gives a negative effective to flood control, waterlog control andnavigation of the estuary. Basing on the engineering practice, aiming at solving theproblem of flood control, applying the mathematical sedimentation model, in thepaper, disposing aggradations plan, discharge capacity and sedimentation capacity ofthe Duliujian river estuary have been researched. It contains generally five parts asfollows:(1) A brief instruction of primary approach to mathematical sedimentation model,and then analyze the characteristic of tide-hydrologic silt.(2) Build up two-dimensional mathematical sedimentation model, which is testedand verified according to measured terrain and hydrologic data.(3) Calculate the discharge capability of the current situation of estuary at variousup-gate water levels.(4) Towards different up-gate water levels, compute the discharge capacity andsedimentation capacity of each plan, meanwhile analyze results and economic value.Give the resolution of the rate of sedimentation.(5) By comprehensive compare, qualitatively analysis the regulations betweenlength, width, bottom elevation of disposed estuary and discharge capacity,sedimentation capacity. Finally, give the optimum plan.The results of this paper could be in practice, it point out the direction to therectification design of the disposed aggradations of Duliujianhe river estuary. Also,this approach could give reference value to silt problems of other estuaries.