KR200168467Y1 - Outfall system of sea dike to improve the circulation in an estuary - Google Patents

Abstract

The present invention aims to increase the seawater circulation of the estuary weakened by the construction of the estuary. In particular, in summer, due to the inflow of many rivers, a layer is formed vertically between light fresh water and heavy seawater, and an oxygen depletion in the bottom layer forms oxygen depletion. However, the existing hydrological discharge system discharges fresh water to the surface layer, forming a layer between heavy seawater in the lower layer and light freshwater in the surface layer, thus preventing vertical mixing.

In the present invention, the oxygen-containing fresh water is discharged to the lower layer through the discharge pipe (2), thereby supplying a large amount of oxygen directly to the lower layer, and at the same time, the fresh water discharged to the lower layer is light, so that it rises to the surface layer and causes vertical mixing. It can greatly improve the circulation environment of estuaries. In addition, by installing the position of the outlet in the mouth of the estuary (1) higher than the high tide line (5) of the seawater, the fresh water is naturally discharged while blocking the backflow of the seawater, which can greatly reduce the manpower and maintenance costs compared to the existing hydrological discharge system (7). .

Description

Outfall system of sea dike to improve the circulation in an estuary

Estuaries are places where rivers meet the sea, where rivers flow constantly into the sea. Even in the larger estuaries like the West Sea of Korea, when the tide is high, the seawater flows back into the river, making the river salt water. Highly salted rivers cannot be used for agricultural or industrial water. Moreover, the backwater of seawater leads to flooding of rivers, causing great damage to surrounding farmland. In order to prevent the damage caused by the backflow of seawater, estuaries are being constructed in the mouth of the main river.

The construction of the estuary blocks the backflow of seawater to prevent flooding, and the freshwater lakes formed upstream of the estuary can be used for agricultural and industrial water. However, the construction of estuaries weakens algae and weakens the circulation of seawater. Weak seawater flows make the ability to vertically mix seawater small.

In particular, due to the outflow of many rivers, small density freshwater is located on the surface of the mouth of the estuary. At this time, the lower layer is cut off of oxygen from the atmosphere by the upper layer, and only oxygen is consumed by the organic material. This results in the formation of oxygen-depleted, hypoxic water masses, which can cause fatal damage to surrounding organisms.

In the estuary, the current freshwater discharge method opens the gate when the sea level is low enough to discharge freshwater into the estuary. However, the freshwater discharged by this method is located in the surface layer as soon as it is discharged because of its low density, and due to the difference in density, the freshwater is layered vertically while staying on the surface layer for a long time with little mixing.

In the freshwater discharge system through the water gate of the existing estuary, the freshwater is discharged to the surface layer, and the layer is formed vertically between the seawater and the freshwater of the estuary, and the oxygen-depleted vacant oxygen lumps are formed in the lower layer. In the present invention, the first freshwater is supplied to the lower layer (2) to directly supply the freshwater containing oxygen to the lower layer, and the second, the light freshwater supplied to the lower layer rises again to the surface layer, thereby making the vertical circulation of the estuary active and making the lower layer. Wants to get rid of

1 shows a side cross-sectional view of the present invention,

2 shows a perspective view of the present invention.

<Explanation of Signs of Major Parts of Drawings>

1. freshwater inlet, 2. freshwater outlet, 3. auxiliary valve, 4. freshwater level,

5. High water level, 6. Low water level, 7. Lock.

Figure 1 shows a side cross-sectional view of the subject innovation, Figure 2 shows a perspective view of the subject innovation. The existing freshwater discharge system (7) is a system for discharging excess freshwater inside the dam by opening the water gate (7) at low tide (6) low water level in the estuary. This system requires a lot of manpower and electrical energy because the water gate must be opened and closed while continuously comparing the freshwater and seawater levels. However, the present invention, by installing the position of the freshwater discharge port (1) higher than the high tide line (5), the surplus fresh water can be continuously discharged to the sea without the need for the operation of the drainage lock. The discharged fresh water is not supplied to the surface layer of the estuary but to the bottom layer 2. Freshwater supplied to the lower layers of estuaries can provide oxygen directly to the lower layers, and because they are light, they rise to the surface and activate the circulation of seawater. In case of sea level surges such as tsunamis, an auxiliary valve (3) is installed to block backflow of seawater.

When the oxygen in the lower layers is depleted, all living creatures are forced to die, and the sediments rot due to lack of oxygen. However, by directly supplying oxygen to the bottom layer and increasing the vertical circulation by the method of the present invention, it is possible to greatly improve the environment of the sediment as well as the ecosystem of the bottom layer.

Existing discharge systems require large amounts of energy and personnel to periodically open and close huge hydrographs for freshwater discharge. In the method of the present invention, as the inflow of river water increases, the water level in the estuary can be increased and discharge can be performed without opening and closing of the gate, thereby greatly reducing manpower and maintenance costs. The amount of discharge can be controlled by increasing the number of outlets according to the size and fresh water of the estuary.

Claims (1)

A method of improving the circulation of an estuary by supplying freshwater in an estuary to a lower layer of an estuary through a discharge pipe (1) and supplying oxygen to the lower layer of an estuary. A method of installing the height (1) of the mouth of the mouth of the estuary higher than the high tide line (5) of the seawater to block the backflow of the seawater and discharge the fresh water freely.