[Jiang Xiaoxi talks about Poyang Lake] "Instruction Manual" of Poyang Lake Water Conservancy Hub

Hello, I'm Jiang Xiaoxi

Today I want to talk to you in detail

Poyang Lake Water Conservancy Project (hereinafter referred to as “the Project”)

How will this major project be used?

In simple terms

The hub is an ecological gate that achieves great protection through small construction

Poyang Lake is a typical seasonal lake.

Changeable and irregular

This is a common hydrological feature in recent years.

The emergence of hubs

A dose of "reassurance" for Poyang Lake

Restoring the natural hydrological rhythm of the lake area

Maintaining the ecological diversity of Poyang Lake

This modern water conservancy project

After repeated verification, it has become more and more perfect

[General principles to be followed in hub dispatch]

In previous articles

We have introduced the basic concept of hubs.

That's right

In these powerful 28 words

Contains the general principle of hub dispatching

——“Regulate drought but not control flood”

Let’s look at the literal meaning first

First, flood control during the flood season

Secondly, adjust the water level during the dry season

Let's take a look at the operating principle

We know

The hub has a close relationship with the Three Gorges Reservoir, the "big brother of the Yangtze River"

Before the Three Gorges Reservoir is filled with water at the end of the flood season

Rationally Utilize Flood Resources at the End of the Flood Season

Keep a certain amount of water in the Poyang Lake area

During the dry season of Poyang Lake

Control the gradual decline of the water level of Poyang Lake

Through scientific regulation of hubs

Restoring the natural hydrological rhythm of the lake area

besides

According to the principle of unified water resources dispatch

Utilizing the water retained in the lake

When special circumstances occur downstream

Still able to stand up

Replenish water downstream

Save partners from danger

The hub is a good project to protect the environment

Strive to minimize the adverse impact of the project

Protect the water ecological environment to the greatest extent

Realize comprehensive utilization of water resources

[Who will be at the helm of the hub's dispatch? ]

It concerns the people's livelihood and ecological environment in the Poyang Lake area

Hub dispatch matters are naturally of great importance

This requires a good "captain" to steer the ship

As a control project on large rivers and lakes

It will be included in the national unified platform for unified dispatching management

The Yangtze River Water Conservancy Commission is responsible for the project dispatch

[How to dispatch such a large hub? ]

Time is of the essence!!

In previous articles, we have introduced more than once

April 1st - August 31st

The floodgates are all open like a bridge

Jianghu Connectivity

September to March of the following year is the general hub regulation period

14.2m is the water level of Poyang Lake certified by experts

We will introduce it in three time periods

First is from September 1st to September 15th

Usually divided into 3 situations

Type 1

When the water level upstream of the gate is > 14.2m

The sluice gates are also fully opened during the flood season.

Even during the regulation period

Type 2

When the water level upstream of the gate = 14.2m

Close some gates

Water will be released gradually according to the water inflow from the "Five Rivers" (Ganjiang River, Fuhe River, Xinjiang River, Raohe River, Xiushui River).

Maintain the water level at 14.2m

Type 3

When the water level upstream of the gate is < 14.2m

Under the premise of ensuring the ecological discharge flow of 598m³/s

The water level can be stored up to 14.2m

Special circumstances

If the main stream of the Yangtze River and the "Five Rivers" have little water

When the flow rate of Datong Station is less than 15000m³/s

Datong Hydrological Station: Located in Chizhou City, Anhui Province, about 624 kilometers away from the mouth of the Yangtze River, it is the last runoff control station on the main stream of the lower reaches of the Yangtze River, providing important observation reference data for flood and drought prevention in the lower reaches of the Yangtze River.

Hubs are open and unregulated

Since “everyone” is dry

Then all gates "lie flat"

Real-time scheduling

To prevent the outflow from Poyang Lake from fluctuating too much

Optimize and adjust the discharge flow in combination with hydrological forecast

The second is from September 16 to November 30

Current water level upstream of the gate,

September 1 to the day before the current scheduling day

The abundance and scarcity of the total runoff of the five rivers into the lake

Scheduling according to situation

During the scheduling process

If the water level above the gate is higher than 14.2m

All sluice gates open

Finally, from December to the end of March of the following year

Dispatching based on the water level on November 30

If the water level difference between the upstream and downstream of the gate is too large on March 21

Then from that day on, the downstream flow rate will be increased.

Gradually lower the water level above the gate

Until April 1, the gates are fully opened

What should we do if water pollution and saltwater intrusion occur suddenly in the lower reaches of the Yangtze River?

Then obey the unified emergency dispatch of the basin agency

According to the water conditions of the Yangtze River and Poyang Lake

Combined with medium- and long-term hydrological forecasts

Implement emergency dispatch according to ecological protection requirements

[Why is the hub dispatched in this way? 】

In terms of time

Comprehensive consideration of the rise of floods in the Poyang Lake system

Flood control impacts in the lake area and water storage time of the upper Yangtze River reservoir group

Combined with factors such as ecological environment protection

The overall control period of the hub

The most suitable time is from September to March of the following year.

In the hub water level control

The Three Gorges Dam and upstream control reservoirs are

The multi-year average water level process is most suitable

At the same time, combined with the water conditions of Poyang Lake

Reflect the water level changes between wet, dry and normal years to achieve scheduling

Maintaining the stability and diversity of the Poyang Lake ecosystem

【END】

Xiao Xi summarizes

Engineering scheduling mainly reflects three "unchanged"

From April to the end of August every year

The function of Poyang Lake in regulating floodwaters from the Yangtze River during the flood season will not be changed.

During the regulation period from September to the end of March of the following year

The total amount of water flowing from Poyang Lake into the Yangtze River will not change

The basic pattern of Poyang Lake, which is “flourishing in summer and dry in winter”, remains unchanged.

The gate of "Happy Poyang Lake" was built with ingenuity. It's great to have you.