The impact of dam construction on the ecological environment

Rising water levels in the upper reaches have led to species extinction and an ecological crisis.

There will be garbage deposition in the upstream of the dam and silt deposition at the bottom of the dam.

The beneficial impact of dam construction on ecology and environment is mainly in the middle reaches, which is the consensus of experts in ecology and environment, flood control, sediment and other aspects.

The construction of the Three Gorges Dam can effectively alleviate the serious damage of the Yangtze River flood disaster to the ecology and environment of the densely populated and economically developed plain areas in the middle and lower reaches. reduce the diversion of water and sediment into Dongting Lake and delay the siltation of Dongting Lake; It is conducive to the prevention and control of schistosomiasis in the middle and lower reaches of the plain and the eradication of snails along the river. It can increase the water depth in the shallow dry period of the middle channel. The environmental problem that may arise is that after the reservoir is put into operation, there will be a riverbed erosion within a certain area downstream of the dam, creating new bank collapses and dangerous river sections. Although there are different views on whether the increase of dry water flow after the regulation of the Yangtze River runoff will aggravate the flooding of the plain lake area and affect the latent cultivation and swamping of the soil, they all believe that as long as the farmland drainage facilities are further improved, the groundwater level is lowered, the agricultural structure is changed, and the comprehensive prevention and control can effectively prevent the latent cultivation and swamping of the farmland soil in the lake area.

For the reservoir area: 1 Change the local climate, increase humidity, and breed mosquitoes. 2 It is possible to cause a new wave of soil erosion. 3 May induce**.

For the estuary: the water of the river entering the sea will be reduced, and the seawater will be injected, which may cause the salinization of the land at the estuary and the increase of the salinity of groundwater.

While alleviating the shortage of water resources and electric power, the development of river hydropower has also brought some negative effects to the ecological environment of the reservoir area and its downstream. These impacts are mainly reflected in: (1) the construction of the project deteriorates the surrounding ecological environment; (2) The impoundment of water in the reservoir leads to the ecological change of the reservoir area; (3) the diversion power station changes the habitat characteristics of the water-scarce section under the dam; (4) River water and sediment changes destroy the balance of water-salt and water-sediment in downstream rivers and estuarine areas.

The damming project will have a greater impact on the ecological environment of the river, mainly including the following aspects: 1Change the flow speed and water level:

After damming, the flow of the river slows down and the water level rises, which has an impact on the physical characteristics of the river. 2.Destruction of river ecosystems:

Damming can cause great damage to river ecosystems, even invasive alien species can be introduced to the flood during the release period. For example, damming will prevent fish from migrating, affecting fish reproduction and development, as well as affecting aquatic plants, insects, microorganisms, etc., which will ultimately have a negative impact on the health of river ecosystems. 3.

Polluted water quality: Damming will block the flow of rivers, make water quality worse, prone to eutrophication and water pollution, and aggravate river pollution through artificial factors such as wastewater discharge. In summary, dam construction will have a greater impact on the ecological environment of the river, so when planning the dam construction project, it is necessary to take into account the impact on the ecological environment and take measures as much as possible to minimize the impact on the ecological environment.

Hello dear The impact of damming projects on the ecological environment of rivers in the process of water storage and power generation mainly has the following aspects: 1Destruction of river ecosystems:

The damming project will destroy the original ecosystem of the river, lead to the decline of river biodiversity, the deterioration of the ecological environment, and cause irreversible effects on the local ecosystem. 2.Riparian erosion:

Damming will change the speed and direction of river flow, lead to aggravation of riparian erosion, affect riparian vegetation growth and soil conservation capacity, and aggravate the damage to riparian ecological environment. 3.Water Quality Changes:

Damming will affect water quality, and nutrients and organic matter in the river will accumulate during the water storage process, resulting in poor water quality and affecting the ecological environment of the river. 4.Flood Disaster Risk:

The damming project will change the hydrological properties of the river, making the downstream areas of the river face a greater risk of flood disasters, and posing a threat to the local ecological environment and the safety of human life and property. Have a great day! If you have any other questions, you can continue to leave a message, and I will answer them for you as soon as possible.

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