湿周是过流断面上流体与固体壁面接触的周界线。
By comparing the two techniques to determine the critical point on the relationship curve between wetted perimeter and discharge for the estimates of the minimum ecological instream flow requirement (MEIFR), the uncertainty of the wetted perimeter method is analyzed.
从湿周-流量曲线临界点的两种不同确定准则入手，分析湿周法推求河道内最小生态需水量（minimum ecological instream flow requirements，简称MEIFR）的不确定性。
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假设河道呈三角形断面和均匀流，得到湿周法的解析解表达式。
Under the assumptions of the triangular cross section channel and the uniform stable flow, an analytical solution of MEIFR is deduced.
在同样水力条件下，最优园底直角断面的湿周是矩形最优断面的83.7%。
The wetted perimeter of this section is 83.7% of the rectangle in the same discharge, reach slope, roughness coefficient.
通过对试验数据的回归分析，得到了细沟过流湿周同流量及坡度的经验关系。
According to the results, an empirical relationship of the rill wetted perimeter with the flow discharge and the slope gradient is obtained by the regression analysis.
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