﻿ 杨堤(三)水文站糙率的推求与应用 Estimation and Application of River Roughness at Yangdi Hydrological Station

Journal of Water Resources Research
Vol. 08  No. 01 ( 2019 ), Article ID: 29076 , 5 pages
10.12677/JWRR.2019.81010

Estimation and Application of River Roughness at Yangdi Hydrological Station

Yanqing Li, Hefan Wang, Xiao Zhou

The Middle Stream of Yangtze River Hydrology and Water Recourses Survey, Wuhan Hubei

Received: Feb. 5th, 2019; accepted: Feb. 20th, 2019; published: Feb. 28th, 2019

ABSTRACT

The river roughness is one of the most important parameters in the hydrological analysis and calculation. According to the measured hydrological data at Yangdi hydrological station from 2007 to 2016, the relation between cross-section roughness and water level was analyzed. Meanwhile, the roughness deduced by the relationship was verified by the measured discharge of 2017. It indicates that the roughness estimated method based on water level and roughness relation curve is reasonable, and is useful in observing high flood discharge.

Keywords:Roughness, Hydrological Station, Flow Discharge, High Water Level Flood

Copyright © 2019 by authors and Wuhan University.

1. 引言

2. 测站概况

Table 1. Statistical results of water level and discharge at Yangdi hydrological station

3. 数据选择

Figure 1. Sketch map of the water system at Yangdi hydrological station

4. 推算成果

$Q=\frac{1}{n}A{R}^{\frac{2}{3}}\sqrt{S}$ (1)

1) 在30.00 m以下的低水位部分，糙率的整体趋势是随水位升高而减小，但点据分布较为散乱。究其原因是在水位较低时，水流受水流边界变化影响的敏感度强，断面平均水深与水力半径相差较大，同一水位级，推算出的糙率最大相差0.010。

2) 在30.00 m以上的中高水位部分，糙率随水位的变化幅度明显减小，趋向于一个常数，约为0.017，个别偏离中心线的点据最大偏离值为0.004。

Figure 2. Relationship between water level and discharge at Yangdi hydrological station

Table 2. Results of calculated and measured discharges at Yangdi hydrological station in 2017

Table 3. Precision test results of observed discharge at Yangdi hydrological station

5. 结语

Estimation and Application of River Roughness at Yangdi Hydrological Station[J]. 水资源研究, 2019, 08(01): 88-92. https://doi.org/10.12677/JWRR.2019.81010

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