﻿ 典型湖流对鄱阳湖出湖实测流量影响研究

# 典型湖流对鄱阳湖出湖实测流量影响研究The Influence of Typical Lake Current on the Outflow of Poyang Lake

Abstract: Poyang Lake is the largest freshwater lake in China, and its water situation is affected by both lake inflow flood and Yangtze river flood. In this paper, the measured discharge of Xingzi station is used to represent the outflow of Poyang Lake, and the influence of typical lake current on outflow is discussed. The conclusions are as follows: 1) Under different lake current patterns, the main factors affecting the change of lake flow or the contribution degree of each factor is different. 2) In gravity flow, the main factor affecting the change of the discharge of Poyang Lake is the inflow. When the fall between the water level of Xingzi Station and that of Hukou Station is greater than or equal to 0.10 m, the lake discharge can be calculated by the inflow and the water level of Xingzi Station. 3) Under the condition of the water jacking of the Yangtze River, the main factors affecting the change of the discharge of Poyang Lake varies with the different water levels of the Yangtze River. When the discharge of Jiujiang station is less than 50,000 m3/s or more than 60,000 m3/s, there is a good correlation between the discharge difference between Datong Station and Jiujiang Station and the inflow into the lake. 4) In the case of the backflow of the Yangtze River on Poyang Lake, the main factors affecting the outgoing flow of Poyang Lake are the amount of water coming from the Yangtze River and the level of Poyang Lake. There is a good relationship between the discharge accumulations of Jiujiang station and the lake discharge accumulations.

1. 引言

2. 数据与方法

2.1. 研究区域与数据获取

Figure 1. Distribution of research areas and stations

Figure 2. Correlation diagram of measured discharge at Xingzi station and compilation discharge at Hukou station

2.2. 流态区分与研究方法

1) 流态区分

$\left\{\begin{array}{l}重力流,\text{\hspace{0.17em}}v>0.2\text{\hspace{0.17em}}\text{m}/\text{s}且\Delta {Q}_{九}-{Q}_{湖}^{0}\le 0\\ 顶托流,\text{\hspace{0.17em}}00\end{array}$ (1)

2) 研究方法

${Q}_{入}=\underset{i=1}{\overset{7}{\sum }}{Q}_{i}+{Q}_{区间水面}+{Q}_{区间陆面}$ (2)

Table 1. The flow levels of different propagation time of each lake-entering river (unit: m³/s)

“五河”和区间径流量进入湖泊后，一般会受到鄱阳湖调蓄作用，根据水量平衡方程可得到考虑调蓄作用

3. 分析与结果

3.1. 重力流对鄱阳湖出湖流量影响

$\left\{\begin{array}{l}LN{Q}_{出}={K}_{1}LN{Z}_{星}+{K}_{2}LN{Q}_{入}+{K}_{3}\text{\hspace{0.17em}}\text{\hspace{0.17em}}\text{\hspace{0.17em}}\Delta {Z}_{星-湖}\ge 0.10\text{\hspace{0.17em}}\text{m}\\ LN{\text{Q}}_{出}={\text{K}}_{1}LN{\text{Z}}_{星}+{\text{K}}_{2}LN{\text{Q}}_{入调}+{\text{K}}_{3}\text{\hspace{0.17em}}\text{\hspace{0.17em}}\text{\hspace{0.17em}}\Delta {Z}_{星-湖}<0.10\text{\hspace{0.17em}}\text{m}\end{array}$ (3)

Figure 3. The relationship between inflow and outflow during the gravity flow period

Figure 4. The relationship between inflow and outflow under different drop conditions

Table 2. Results of multivariate regression coefficient calculation

(a. ∆Z星−湖≥ 0.10 m )(b.∆Z星−湖 < 0.10 m)

Figure 5. The correlation between flow fitting value and measured value

3.2. 顶托流对鄱阳湖出湖实测流量影响

Figure 6. Compound relationship between Qoutflow and $\Delta {Q}_{datongtojiujiang}$, Qinflow

3.3. 倒灌流对鄱阳湖出湖实测流量影响

(a.2016年，倒灌首日星子水位18.80 m) (b.2017年，倒灌首日星子水位13.99 m)

Figure 7. During flowing backward period, The Poyang Lake flow and the flow change of Jiujiang

(a.2016年，倒灌首日星子水位18.80 m) (b.2017年，倒灌首日星子水位13.99 m)

Figure 8. During flowing backward period, The relationship between the flow accumulation of Poyang Lake and the flow accumulation of Jiujiang

4. 讨论

5. 结论与展望

1) 重力流下，影响鄱阳湖出湖流量变化的主要因素是五河来水量，且出湖流量大小能够利用湖区水位高低来反映；

2) 顶托流下，影响鄱阳湖出湖流量变化主要因素受长江水量级别不同而发生变化，且五河来水量的大小也发挥一定的作用；

3) 倒灌流下，影响鄱阳湖出湖流量主因是长江来水量大小和鄱阳湖水位多少，倒灌期间九江流量变化累积效应能够很好的反映出湖流量累积效应的变化。

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