| 1. | Planar 2 - d flow and sediment numerical modeling of branching river
天然分汊河道平面二维水流泥沙数值模拟研究 |
| 2. | Study on main fork changing place characteristics of branching river course in , idle and lower course of changjign river
长江中下游分汊河道主支汊易位特性研究 |
| 3. | The bifurcated channel is a common river type , and there exists realistic meaning for the study on the division characteristics of the bifurcated channel
分汊河道是一种常见的河型，其特性研究在河道整治工程中有着重要的现实意义。 |
| 4. | 8 . a simplified 3 - d natural river flow and sediment transport model is developed based on hydrostatic pressure distribution . the model has been applied to investigate the 3 - d flow and suspended - load transport in nanjing river reach with two branches
( 8 )天然三维水流泥沙简化数值模型，成功地模拟南京某河段水流运动和多分汊河道水沙计算，结果可靠并满足精度。 |
| 5. | In terms of the minimum energy dissipation rate theory , the division angle and deflection angle formulas are derived and applications with some topography data of the pearl river delta waterway are introduced . finally , a 2 - d flow model in the orthogonal coordinates is established
本文从最小能耗率的原理出发，推导分汊河道的分流角、偏转角计算的理论公式，以角度计算公式的变换形式推导分流比公式，并介绍了最小能耗率原理的一些其它应用。 |
| 6. | In the past , more emphasis has been put on the flow pattern and the division ratio of water and sediment discharge . in order to study the division characteristics , a theoretic model is proposed in this thesis , which combines the plan configuration of channels with the minimum energy dissipation rate theory
本文将河流动力地貌学中的平面形态和最小能耗率理论相联系，研究分汊河道的分流特性，并推导理论分流模式；另一方面，通过建立二维水流数学模型，与理论分析结果进行比较。 |
| 7. | Using the 1 - d rivernet model calculates the water discharge ratio of the two branches and also duplicates the back - flow in the north branch during flood tide . the 2 - d model with a fine grid is applied to the field of flow in the changjiang estuary and the results are well in agreement with the measured flow
同时利用河网模型对长江口分汊河段进行一个月的水流模拟，并获得了长江口南北支分流比，复演出北支涨潮时水体倒灌转流现象，解决了河网模型用于分汊河道潮汐水流模拟的问题。 |
| 8. | Excavating riverbeds in one channel may not only reduce the velocity area in some areas but also increase the velocity in other areas by increasing flow rate in this channel without correspondent changes in riverbeds of rocky rapids . in result , the velocity in waterway may be increased instead of be reduced , the flow condition may also be deteriorated . thus , which branch should be excavated and how to excavate in improving the flow condition of the branch should be further explored
但在分汊河道内，情况较为复杂，在一汊河道内采取开挖措施后，虽然其过水断面有所增加，局部流速相应降低，但是由于工程后，汊道的分流比将会相应变化，而石质河床一般无法通过冲淤变化以适应水流条件的改变，因此，航道内工程处的流速可能降低，也可能不降反而有所增加，恶化了航道的水流条件。 |
