经推导，得到了反映水流动力因素、河床几何尺寸和边界特征的河床稳定性综合指标一般表达式。
Through derivation the general formula is obtained, which reflects the flow dynamic factors, the characteristics of river-bed geometry and boundary.
而河床地形变化引起的三角洲河网区潮汐动力增强，则是感潮河段低水位上升的主要原因。
The strengthening of the tidal power caused by the significant topographic change is responsible for the rise of the low water levels in the tidal reach.
在长期系统研究的基础上，分析对比了长江口的水流动力、泥沙运动和河床演变等各种条件，选择了北槽作为长江口深水航道先予治理，确立了符合长江口实际情况的治理原则。
According to the analyses, the North Channel is selution as the main deep-water navigation channel to the sea and is to be pre-trained, and the training principle of the Yangtze Estuary is determined.
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