三座店水库运行50年后取水塔含沙量数值模拟分析

三座店水库所属河流含沙量高，工程建成运用后河道的水沙条件将会发生改变，可能会影响整体河势调整和行洪能力。为准确掌握库区泥沙淤积状况，采用 Delft3D 三维水动力泥沙输移数学模型，对水库运用50年后取水塔各层取水窗口的含沙量进行数值模拟，分析含沙量与流速、含沙量持续时间等特征关系。模拟结果表明：水库运用50年后，左、右泄洪洞和取水塔的含沙量大于原地形含沙量；50年一遇频率洪水含沙量较100年和20年高，垂线平均含沙量由大到小依次为右洞、左洞、取水口；50年系列大于3 kg／m3的含沙量持续时间不超过23．5 d 。

Numerical Simulation of Sediment Concentration Distribution at Water Intake Tower in Sanzuodian Reservoir after 50 Years Operation

Aiming at the complex situation of high sediment concentration and changed water-sediment conditions after the project completion which will affect the whole river regime adjustment and flood control capacity ,in order to accurately grasp the sediment deposition in the reservoir area ,the three-dimensional hydrodynamic sediment transport mathematical model was adopted to analyze the sediment concentration characteristics .The simulation results showed that after 50 years operation the sediment concentration in left and right flood discharging tunnel was higher than the original terrain .The 50 years return period flood sediment concentration is higher than 100 and 20 years return period flood ,and the perpendicu-lar averaged concentration right spillway tunnel is the maximum with 109 .53 kg/m3 ,which followed by the left spillway tunnel with 77 .90 kg/m3 ,the least is the water intake tower with 67 .62 kg/m3 .In 50-year series ,the duration is less than 23 .5 days at the sediment concentration conditions bigger than 3 kg/m3 .