CN112726488A

CN112726488A - River and lake limited communication method for guaranteeing water quality safety of urban lakes

Info

Publication number: CN112726488A
Application number: CN202011415468.9A
Authority: CN
Inventors: 胡朝阳; 梁越; 付开雄; 王乐乐; 王星莉; 高梦露
Original assignee: Fujian Provincial Investigation Design & Research Institute Of Water Conservancy And Hydropower
Current assignee: Fujian Provincial Investigation Design & Research Institute Of Water Conservancy And Hydropower
Priority date: 2020-12-07
Filing date: 2020-12-07
Publication date: 2021-04-30

Abstract

The invention discloses a limited river and lake communication method for guaranteeing the water quality safety of urban lakes, which comprises the following steps: the urban lake, the inland river of the lake entering city, the inland river of the lake exiting city, the interception gate and the drainage pipeline are arranged at the tail end of the inland river of the lake entering city, the drainage pipeline is arranged between the inland river of the lake entering city and the inland river of the lake exiting city around the bank line of the urban lake, and the interception gate is closed in the early stage of no rainfall or rainfall so that initial rainwater passes through the drainage pipeline and is discharged into the inland river of the lake exiting city, thereby avoiding the initial rainwater from entering the urban lake and ensuring the water quality safety of the urban lake; when the flood water gradually increases in the middle and later periods of rainfall or in the upstream of rivers in the lake city, the interception gate is opened, the flood water enters the urban lake, the flood-retaining and storing functions of the urban lake are exerted, and the urban flood disaster defense capacity is improved.

Description

River and lake limited communication method for guaranteeing water quality safety of urban lakes

Technical Field

The invention belongs to the technical field of hydraulic engineering, and particularly relates to a limited river and lake communication method for guaranteeing the water quality safety of urban lakes.

Background

In urban areas, a large amount of pollution gases such as acid gas, automobile exhaust, factory waste gas and the like above cities are dissolved in initial rainwater, and after the rainwater falls to the ground, the rainwater in the early stage often contains a large amount of pollutants due to scouring of urban roofs, cement or asphalt concrete roads and the like, and the rainwater can bring serious water pollution to urban rivers after being directly discharged into the urban rivers through rainwater pipes. When the urban inland river is communicated with the urban lake, polluted water and pollutants in the urban inland river can certainly enter the urban lake, the water supply and self-purification capacity of the urban lake are naturally insufficient, the pollutants are not easy to go out once coming in and are not easy to degrade, so that the pollutants can be gathered to cause bottom mud pollution, further vicious circle is caused, the water is black and smelly, the urban lake is formed, how to avoid the polluted water and the pollutants in the urban inland river is how to avoid the initial rainwater of the urban river to enter the urban lake, and the important precondition for guaranteeing the water quality safety of the urban lake is that the initial rainwater of the urban river enters the urban lake. In addition, the urban inland rivers and the urban lakes play an important role in urban flood control and drainage systems, and the urban inland rivers are communicated with the urban lakes to further enhance the urban flood disaster prevention capability, but the pollutant transfer risk also exists. Therefore, when the urban inland river is communicated with the urban lake to meet the requirement for improving the urban flood disaster prevention capability, how to effectively avoid pollutants caused by the urban inland river from entering the urban lake, particularly the problem that initial rainwater pollutes the urban lake.

Disclosure of Invention

(1) Technical problem to be solved

Firstly, the urban inland river is communicated with the lake, and the water quality safety of the lake is influenced because initial rainwater is discharged into the urban inland river and then enters the urban lake;

how to comprehensively coordinate the improvement of the urban flood disaster prevention capability brought by the communication of the urban rivers and lakes and the problem of guaranteeing the water quality safety of the urban lakes.

(2) Technical scheme

In order to solve the technical problems, the invention provides a limited river and lake communication method for ensuring the water quality safety of an urban lake, which comprises the urban lake, an inland river in the lake-entering city, an inland river in the lake-exiting city, an interception gate and a drainage pipeline, wherein the inland river in the lake-entering city is arranged at the water inlet end of the urban lake, the inland river in the lake-entering city is arranged on the inland river in the lake-exiting city communicated with the urban lake in the opposite surface of the inland river in the lake-entering city, the interception gate is arranged at the lake-entering port of the inland river in the lake-entering city, the drainage pipeline is arranged around the bank line of the urban lake between the inland river in the lake and the inland river in the lake-exiting city, the water inlet of the drainage pipeline.

Furthermore, the drainage pipeline adopts an underground pipe-burying form, and the pipe diameter of the drainage pipeline is determined according to the initial rainwater quantity or the interception water quantity designed by an interception gate.

Furthermore, the interception gate adopts a bottom transverse shaft flap gate to coordinate with the landscape of the urban lake. The width of the gate of the interception gate is not less than the width of the river in the lake-entering city, the elevation of the bottom plate of the interception gate is smoothly connected with the elevation of the bottom of the river and the urban lake in the lake-entering city, and the elevation of the top of the interception gate is not lower than the daily control water level of the urban lake.

Furthermore, a second interception gate is arranged at the joint of the lake-outlet city inland river and the city lake.

The design principle is as follows: at the early stage of no rainfall or rainfall, the interception gate is kept in a closed state, the upstream landscape water level of the river in the lake city is maintained, the water coming from the river in the lake city is intercepted, and the water is discharged into the river in the lake city by crossing the urban lake through the drainage pipeline, so that the water is prevented from entering the urban lake. And when the flood water gradually increases in the middle and later periods of rainfall or in the upstream of the inland rivers in the lake city and exceeds the maximum drainage capacity of the drainage pipeline, the interception gate is opened, the flood water enters the urban lake, the flood storage function of the urban lake is exerted, and the defense capacity of the urban flood disaster is improved.

(3) Advantageous effects

The invention has the beneficial effects that:

the early rainwater in the river in the city is effectively prevented from entering the city lake, and the water quality safety of the city lake is guaranteed;

the contradiction between the improvement of the urban flood disaster prevention capability brought by the communication of the urban rivers and lakes and the guarantee of the transfer risk of pollutants in the urban rivers and lakes is effectively coordinated, and the water quality safety of the urban lakes is guaranteed.

Drawings

The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention.

FIG. 1 is a schematic diagram of the flow of water in urban rivers and lakes in the absence of rainfall or during the early stage of rainfall.

FIG. 2 is a schematic diagram of the flow of water in rivers and lakes of an urban area when flood water gradually increases in the middle and late periods of rainfall or upstream of rivers in the urban area.

Detailed Description

The technical solutions in the embodiments of the present invention are further clearly and completely described below with reference to the embodiments, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.

Example one

The embodiment provides a limited river and lake communication method for guaranteeing the water quality safety of an urban lake 1, and please refer to fig. 1, wherein the communication method comprises the urban lake 1, an inland river 2 in a lake-entering city, an inland river 3 in a lake-exiting city, an interception gate 5 and a drainage pipeline 4, wherein the water level of the urban lake 1 is controlled to be 4.5m, and the elevation of the bottom of the lake is 2.0 m-2.5 m; 2 river channels of inland rivers in lake cities are 18m wide, and the river bottom elevation is 2.5 m; the width of the 3 river channels of the inland rivers in the lake-out city is 18m, and the elevation of the river bottom is 2.0 m.

The water inlet end of the urban lake 1 is provided with the lake entering urban inland river 2, the opposite surface of the lake entering urban inland river 2 is arranged on the lake outlet urban inland river 3 communicated with the urban lake 1, then the lake inlet port of the lake entering urban inland river 2 is provided with the interception gate 5, the drainage pipeline 4 is arranged between the lake entering urban inland river 2 and the lake outlet urban inland river 3 around the bank line of the urban lake 1, the water inlet of the drainage pipeline 4 is arranged on the upstream side of the interception gate 5, and the water outlet of the drainage pipeline 4 is connected to the lake outlet urban inland river 3.

In the embodiment, the drainage pipeline 4 is in an underground buried pipe form, the pipe diameter of the drainage pipeline 4 is determined according to the design intercepted water quantity of the interception gate 5, and the interception gate 5 is designed to intercept the water quantity of 18.5m which is the flood frequently encountered by the rivers in the lake city³And/s, calculating the pipe diameter of the drainage pipeline 4 to be DN2000 by adopting an economic pipe diameter formula. The elevation of the bottom of the drainage pipeline 4 is 2.0-2.5 m, the elevation of the bottom of the water inlet pipeline is 2.5m, the elevation is the same as the elevation of the bottom of a bed 2 of a river in a lake-entering city, and the elevation of the bottom of the water outlet pipeline is 2.0m, the elevation is the same as the elevation of the bottom of a bed 3 of the river in a lake-exiting city. The interception gate 5 adopts a bottom transverse shaft flap gate to coordinate with the landscape of the urban lake 1. The width of the interception gate 5 is 18m, the width is the same as the width of a river 2 in a lake-entering city, the elevation of the bottom plate of the interception gate 5 is 2.5m, the elevation is smoothly connected with the elevation of the bottom of the river 2 in the lake-entering city and the elevation of the bottom of an urban lake 1, and the elevation of the top of the interception gate 5 is 4.6m, which is higher than the daily control water level of the urban lake 1. In order to control the water level of the urban lake 1 conveniently, a second interception gate 6 is arranged at the joint of the lake-outlet urban inland river 3 and the urban lake 1.

Referring to fig. 1 and 2, in the early stage of no rainfall or rainfall, the interception gate 5 is kept closed, the landscape water level at the upstream of the river 2 in the lake city is maintained, water entering the river 2 in the lake city is intercepted, and the water is discharged into the river 3 in the lake city across the lake 1 through the drainage pipeline 4 to avoid entering the lake 1. And (3) when the flood water gradually increases in the middle and later periods of rainfall or in the upstream of the inland river 2 in the lake city and exceeds the maximum drainage capacity of the drainage pipeline 4, the interception gate 5 is opened, the flood water enters the urban lake 1, the flood stagnation and storage function of the urban lake 1 is exerted, and the urban flood disaster defense capacity is improved.

The above examples are merely representative of preferred embodiments of the present invention, and the description thereof is more specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, various changes, modifications and substitutions can be made without departing from the spirit of the present invention, and these are all within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. The limited river and lake communication method for guaranteeing the water quality safety of the urban lake is characterized by comprising the urban lake, an inner river of a lake entering city, an inner river of a lake exiting city, an interception gate and a drainage pipeline, wherein the inner river of the lake entering city is arranged at a water inlet end of the urban lake, the opposite surface of the inner river of the lake entering city is arranged on the inner river of the lake exiting city communicated with the urban lake, the interception gate is arranged at a lake inlet of the inner river of the lake entering city, the drainage pipeline is arranged between the inner river of the lake entering city and the inner river of the lake exiting city and surrounds a bank line of the urban lake, a water inlet of the drainage pipeline is arranged on the upstream side of the interception gate, and a water outlet of the drainage pipeline is connected to the inner river of the lake exiting city.

2. The method as claimed in claim 1, wherein the drainage pipeline is in the form of an underground buried pipe, and the diameter of the drainage pipeline is determined according to the initial rainwater amount or the interception water amount designed by an interception gate.

3. The method of claim 1, wherein the interception gate is a bottom horizontal axis flap gate, the width of the interception gate is not less than the width of the river in the lake entering city, the elevation of the bottom plate of the interception gate is smoothly connected with the elevation of the bottom of the river in the lake entering city and the lake, and the elevation of the top of the interception gate is not lower than the daily control level of the lake.

4. The method of claim 1, wherein a second interception gate is arranged at the connection between the lake-out city inland river and the lake.