论文部分内容阅读
游荡性河段的河势演变始终处于激烈变化之中而难以稳定的关键因素有二：一是河床由细沙组成，无法扼制严重的塌滩塌岸；二是众多节点控导工程难以适应激烈变化的来水来沙条件，使得控导作用时有时无、时大时小、时好时坏。资料表明主，流线年际间的摆动形式是波状的，河势的突变多发生在一场洪峰过程中的涨水近于峰顶时或高峰过后的落水期，其中前者主要表现为洪水的拉滩取直改道，而后者则多见横、斜河的发生。稳定河势的关键并不完全在于整治控导工程的多少，其合理的布设和正确的规划设计参数同样重要，只有通过对节点工程的合理改造和调整，使大、中、小水时期的河床演变均置于包括工程在内的边界控制之下，方能达到控制河势游荡散乱的目的。
The evolution of the river regime in the wandering reaches of the river has always been in a fierce change and difficult to stabilize the key factors are two: First, the riverbed composed of fine sand, can not curb the serious collapse of bank collapse; Second, many nodes control project is difficult to adapt to intense Changes in incoming and outgoing conditions, making the control of the role sometimes, when the big small, good times and bad. The data show that the wobbling patterns between the main stream and the streamline during the inter-annual period are wavy. The sudden change in the river regime occurs mostly during the flood peak near a peak or after a peak. The former mainly manifests as flood Pull Beach straight diverted, while the latter is more common horizontal, ramp River. The key to stabilizing the river regime is not exactly the number of remediation pilot projects. Its rational layout and correct planning and design parameters are equally important. Only through the rational alteration and adjustment of the node projects, the riverbed in the middle, The evolution is under the control of the boundary including the engineering, so as to achieve the purpose of controlling the wandering and messing rivers.