基于栅格的不规则断面水深–流量关系曲线确定方法

Grid-Based Determination Method for Water Depth-Discharge Curve of the Irregular Cross-Section

摘要: 天然渠道断面大多是不规则的，水深–流量关系多为高阶隐函数，直接绘制比较困难。本文引入栅格，基于断面测量确定选定断面的形状，以在选定断面上插入栅格的数量推求不同水深的过流面积，通过水准测量及试验等方法率定计算参数，计算确定水深–流量的关系曲线。为水文学上在不规则断面下的流量计算提供一种可用的方法。

Abstract: Most of the cross-section form of the natural river channel is irregular and the stage-discharge curve (h~Q curve) is higher-order implicit function which causes the difficulties in deriving curve directly. In this study, the sectional form was determined by crossing section measurement, and the flow area corresponding to the different water depth was estimated by number of grid which was inserted in the adopted cross-section. The parameters used in calculation were calibrated through leveling survey and experiment, and the stage-discharge was achieved by calculation, therefore a practicable method was provided for flow calculation under the various irregular sections of hydrology.