# 巴曲2018年最大洪水调查与重现期分析Investigation and Analysis of Recurrence Period for 2018 Maximum Flood at Baqu

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Based on the investigation of the largest flood at Baqu in 2018 and the use of flood data from Baqu hy-drological station, the flood peak discharge with different design frequencies was calculated. The determined maximum flood peak discharge, occurrence time and recurrence period are of great significance for local flood prevention and disaster reduction and assessment. At the same time, relevant hydrological data are obtained, which can provide scientific basis for rational development and utilization of water resources, formulation of flood control planning and urban development layout.

1. 前言

2018年6至7月期间，同德县巴曲流域相续出现强降水，降水形成的洪水直接冲毁巴曲部分已建的河道治理的工程，造成了重大的经济损失。因此开展巴曲洪水调查，确定最大洪峰流量及发生时间以及分析重现期对今后灾情评估具有十分重要意义。

2. 基本情况

2.1. 流域概况

2.2. 气候特征

3. 洪水调查

3.1. 洪调断面选择

Figure 1. Flood survey large cross-sectional of upper and lower section of Baqu

Table 1. Results of flood trace measurement at Baqu flood survey river reach

Table 2. Measurement results of longitudinal section of channel at Baqu river reach

Figure 2. Flood surface line and river bottom slope of Baqu diversion reach

3.2. 洪峰流量计算

$Q=\frac{\stackrel{¯}{K}{S}^{1/2}}{1-\frac{1}{2gL}{\stackrel{¯}{K}}^{2}m}$ (3-1)

$\frac{A}{B+2H}$ 表示；河段逐渐收缩或扩散时， $m=\left(1-\xi \right)\alpha \left(1/{A}_{上}^{2}-1/{A}_{下}^{2}\right)$ ，ξ为断面沿程收缩或扩散系数，河段断面

Table 3. Statistical of the survey results of Baqu flood

3.3. 洪峰时间的确定

4. 设计洪水计算

Table 4. Design flood results of reference hydrological station

Figure 3. Frequency curve of the maximum flood peak discharge in Batan (ii) hydrological station

5. 设计洪水结果选取

Table 5. Summary of design flood results of Baqu

6. 结论

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