Method for regulating confluence of tributaries with large drop difference and large angle into trunk canal

A method for regulating confluence of tributaries with a large drop difference and a large angle into a trunk canal, comprising:

• banking up a water level at an upstream end of a tributary river, and widening a water surface, such that uniform distribution of water flows is completed;
• then conducting souring and energy dissipation to reduce a flow velocity and kinetic energy of the water flows;
• then conducting flow-slowing sedimentation, such that sediment is deposited on one side of the tributary river connected to a downstream side of a trunk stream;
• and then conducting flow diversion at one side of the tributary river connected to an upstream side of the trunk stream, such that an included angle of confluence of tributary river water into the trunk stream is reduced;
• wherein the method is implemented by means of a hydraulic construction system for energy dissipation, sediment settling and flow diversion of a tributary river, wherein the hydraulic construction system for energy dissipation, sediment settling and flow diversion of a tributary river is arranged in the tributary river and comprises a high platform, a stilling basin, a low platform and a diversion dike that are sequentially connected from the upstream end to a upstream section of the tributary river, wherein an upstream end of the high platform is provided with a sediment-blocking downflow weir, riverbanks on two sides of the high platform are designed to be splayed and widened in a downstream direction, a downstream end of the high platform is connected to a steep slope of the stilling basin, a lower end of the steep slope is connected to a basin body of the stilling basin, a downstream end of the basin body of the stilling basin is connected to the low platform, an upstream end of the low platform is higher than a bottom of the basin body of the stilling basin such that the basin body is formed, the diversion dike has a consistent water flow direction with the trunk stream of a confluence and is fixedly arranged at a joint of an upstream side of a tributary and the trunk stream such that the diversion dike and the upstream side of the tributary river intersect at an obtuse angle, and a lower half of the low platform is located between the diversion dike and an opposite tributary downstream side bank;
• and wherein a trunk river has a widening zone formed through external widening on upstream and downstream sides of the confluence of the tributary, the tributary is connected to the widening zone, and the diversion dike is arranged in the widening zone.