| 1. | The effects of spur dikes group to the flow are different to that of single spur dike
群坝对水流的作用机理与单丁坝的作用机理不相同。 |
| 2. | The first one among spur dikes group in regulation river reach has the most important holdback effect than the others
整治河段中第一根丁坝对水流的阻挡作用最大。 |
| 3. | Spur dike is a kind of hydraulic structure that is widely used in channel regulation engineering for controlling the shape of the nature river
修建丁坝可束水归槽，保护岸堤，但也会带来分离、回流等一系列复杂的流动现象。 |
| 4. | Flow structure near the spur dike is very complicated , and areas with apparent three - dimensional characteristic exist in the vicinity of spur dike
水流三维流动特性主要集中在丁坝附近区域.丁坝对下游的影响区域远远大于对上游的影响区域。 |
| 5. | Three kinds of permeable pile dikes with different seepage rate are tested , and effect of flow control is basically the same with the spur dike ,
试验的三种透水率桩坝，其导流效果与实体丁坝群的基本相同，并未因部分透水及形态不同而使其控导作用明显减弱。 |
| 6. | It is of great importance for the design of channel regulation structure to explore the effect of spur dikes on flow , and to study the flow structure near the spur dike
研究丁坝对水流的影响规律以及丁坝附近水流的流动结构对于航道整治建筑物的设计具有十分重要的意义。 |
| 7. | The flume experiment with single spur dike is carried out . water surface profile and velocity field of flow in flume are measured by manometer tube and propeller current meter respectively
首先进行了单丁坝水槽实验，采用测压管和旋浆流速仪对实验水槽中水流的水位以及流速场进行了详细的测量。 |
| 8. | The effects of the two methods of " sucking - spouting " water and flow - deflection on the horizontal circulation were tested experimentally in a 50cm - width flume with a spur dike placed as a barrier
可以把主流的一部分能量传给边界层内靠近壁面的流体质点，使之加速，从而达到防止边界层分离的目的。 |
| 9. | Silt will deposit there . velocities around groin head are larger than the scour velocity and scour hole may develop in this area . this would affect the stability of spur dikes
受丁坝阻挡，坝田所在的边滩区域流速很小，泥沙在此淤积:而坝头附近流速较大，通常在此区域形成冲刷，影响丁坝的稳定性。 |
| 10. | Only the method for using backwater expression can predict the variation of water surface near the spur dike very well . numerical simulations of the flume experiment cases are carried out with the standard k - e turbulence model
随后采用标准k一e紊流数学模型，依据水槽试验资料，数值模拟了绕坝和漫坝两种情况下水流的流动过程。 |
