Lakes and oceans are bodies of surface water.
Surface water? Including water from rivers, lakes and reservoirs. Surface water bodies are natural places where precipitation gathers. Water that falls to the ground flows along surface runoff, flowing from high to low areas, and finally accumulates in the local river to form the river basin. Surface water characteristics include large water volume and low water scarcity. They are suitable for water use in cities and industrial areas; they are easily polluted by animals, plants and humans.
It contains many germs and is easily polluted by domestic and industrial wastewater. It has lower hardness than groundwater, but due to direct contact with the atmosphere it has higher turbidity, impure contenthigher suspended tees and a greater quantity of suspended impurities. changes in water temperature.
Characteristics of the lakes:
1. The water flow is slow and the lake water change cycle is long.
The lake water is generally poor. relatively high mobility and turbidity. Low high transparency, but the water flow is not easy to mix, and uneven distribution of water quality will occur, especially in deep water lakes or large capacity lakes.
2. The salinity of lake water is higher than that of rivers
Due to the strong dissolution effect of water on the substrate and the evaporation of lake surface water, the salinity of the Lake water is generally higher than that of rivers. And since the water stays in the lake for a long time, it will strengthen the dissolving effect of the lake water on the rocks and soil in the lake basin. At the same time, the water surface of the lakeis relatively wide, and strong evaporation from the water surface increases the salinity of lake water, ultimately leading to changes in water quality components.
3. Changes in water quality composition are affected by the size of the lake surface area.
The size of the lake surface area will not only affect the regulation of its water volume, but will also lead to changes in water quality composition. Generally, the water quality of large lakes is more stable than that of small lakes. At the same time, the water quality of small lakes has strong regional characteristics, while the water quality of large lakes is equivalent to the average water quality of large lakes. area.
The difference is obvious.
Dictionary explanation: Lake is the general name for lakes. Refers to a large area of inland backwater, the expansion of a river, a reservesee having a dam or lake bed which is intermittently or previously covered by water. A river refers to a natural flow of water on the earth's surface that contains a considerable amount of water and flows year-round or seasonally.
The difference is:
1. Lake water is relatively static, while river water flows;
2. ; rivers occur in the form of bands and lines;
3. Lakes include water surface and wetlands, swamps and dry lake beds around water surface generally refers to flowing water surfaces and wetlands along rivers; are called beaches and mudflats.