| 摘要: |
| 用MIKE21水动力模块和物理模型对三里埂汇流段流场进行了模拟。经过试验验证，模拟结果和实测资料吻合较好，说明两个模型的建立是成功的。数学模型对深槽内水流的水力学性质研究表明，深坑处是深槽沿程受水流剪切力、冲击力以及弯道环流最大的区域。深坑被剥蚀和冲刷下来的泥沙通过弯道环流向对岸高滩输运，形成高滩不断淤高，深坑不断冲刷的状况。此外，由物理模型试验对深坑处流态的观察可知，深坑处于水流交汇和分汊不断变化区域，经常出现漩涡、汇流、紊流等不良流态，这些流态提高了水流紊动能量和挟沙能力，为深坑的发展提供了有利条件。三里埂汇流段水动力状况的数学模型和物理模型研究为该河段深坑的整治提供了理论依据。 |
| 关键词: MIKE21水动力模块 物理模型 深坑 流态 |
| DOI： |
| 分类号:U617 |
| 基金项目: |
|
| Analysis of a deep pool at Sanligeng reach in Wuhu-Shanghai canal |
|
SHAO Yu-chen1,2, DING Jian1,2, WU De-an2, FU Min-ming2, HAN Wen-jun3
|
|
1.Key Laboratory of Coastal Disaster and Defence， Ministry of Education， Hohai University;2.College of Harbour， Coastal and Offshore Engineering， Hohai University;3.School of Civil Engineering， Lanzhou Jiaotong University
|
| Abstract: |
| Two mathematical models by using a MIKE21 flow model with a physical model are both established to simulate the flow field of the confluence near Sanligeng reach. Because of good correspondence of simulating results and test data in comparison with each other， the establishment of the two models are both proved to be successful. Hydraulic research results given by the mathematical model show that shear force， impact force and circulation flow in the deep pool are the largest along the groove. The sediment which is disintegrated and washed down from the deep pool will bring about lateral moving because of the transverse circulation. So the sediment of the deep pool near the concave bank will be scoured and deposited in the high beach of the convex bank.In addition， through observation of the flow patterns in the physical model， it is found that the flow often changes in the form of meeting and bifurcating in the deep pool, which leads to adverse flow patterns such as vortex， flow and turbulent flow. The adverse flow patterns can improve the flow turbulence energy and carrying capacity which will provide favorable conditions for the development of the deep pool. The studies of the hydrodynamic condition in the confluence segment of Sanligeng by two models provide a theoretical basis for the regulation of the deep pool in the reach. |
| Key words: MIKE21 flow model physical model deep pool flow pattern |
