Method for determining channel forming discharge in river sink of tributary stream

Abstract

The invention provides a method for determining the channel forming discharge in the river sink of the tributary stream, and takes hydrological and weather factors of the main stream and the tributary stream into consideration. The method is characterized by comprising the following steps: step 1, distinguishing the steady state of the incoming water and sediment of the tributary stream channel and determining the sediment transport rate index; step 2, performing interval partition on the flow rate data of the hydrometric station at the inlet of the river sink and the water level data of the hydrometric station at the outlet of the river sink; step 3, determining the gradient relation curve of the river sink of the tributary stream; and step 4, drawing a channel forming strength line in the inlet flow rate-outlet water level coordinate plane, and calculating the channel forming discharge by adopting a graphical method.

Description

technical field [0001] The invention belongs to the technical field of water conservancy and water transport engineering, and in particular relates to a method for determining the bed-forming flow rate of the tail section of a tributary. technical background [0002] The bed-making flow refers to a certain flow level that is equivalent to the comprehensive bed-making effect of the multi-year flow process on the shaping of the alluvial river bed. Whether it is reasonable or not will directly affect the cost, effect and even success of river regulation. [0003] For a general single alluvial channel, the shape of the channel is mainly affected by the process of incoming water and sediment from the upstream, and the bed-forming flow rate can be calculated by combining the inlet water and sediment data of the river section with mature methods such as the "Makaveyev method". [0004] In the tail section of the tributary near the intersection of the main and tributary rivers, the...

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Problems solved by technology

The above indirect method increases the demand for data such as edge beach topography and water level along the way, which is highly empirical and poor in operability

Especially after the reservoir is built on the main stream, the water level adjustment of the main stream will change the erosion base level of the tail section of the tributary, and the elevation of the edge bank will also be adjusted accordingly. It is difficult to quantify the bed-making flow under the new situation by relying on indirect empirical methods Calculations cannot meet the needs of river regulation planning and engineering design

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