Traditional Culture Encyclopedia - Weather forecast - What are the reasons for flood warning?
What are the reasons for flood warning?
What are the reasons for flood warning?
man-made causes
Man-made reasons mainly include: destroying forest vegetation and causing soil erosion. Forests have good water storage function. On the one hand, forests can intercept precipitation; On the other hand, forests have high soil permeability and good water storage capacity.
Reclaiming land around lakes affects flood storage capacity. Embankment around lakes and farmland around rivers and lakes will reduce the number of lakes, block rivers and greatly reduce flood storage capacity. Once there is continuous rainstorm, a large amount of precipitation will flow into the river, causing the river to skyrocket and flood.
Invasion of the river, poor water. In the event of heavy rain, the river surges, and the flood is blocked. The influence of water structures cannot be discharged smoothly, which is easy to form breakwaters and piping, causing a lot of losses.
The standard of flood control facilities is low. Once there is a rare flood in history, it will inevitably lead to a flood. Excessive pumping of groundwater in large and medium-sized cities has caused land subsidence and aggravated the danger of urban floods. In addition, the bean curd dregs of some dams lead to the occurrence of induced and aggravated floods.
natural cause
Natural reasons are mainly due to the influence of climate, topography, characteristics of water system, river characteristics and basin characteristics. The occurrence of rainstorm is mainly influenced by atmospheric circulation, weather and climate system, and it is a natural phenomenon. Weather and climate factors are the direct cause of heavy rain. When a rainstorm occurs, the geographical environment becomes an important factor affecting the occurrence of disasters. Geographical environment includes topography, landform, geographical location and river distribution. Increased precipitation and slower drainage speed are more likely to induce floods.
Today, Bian Xiao briefly introduced the flood warning. If you still want to know about flood warning, please continue to pay attention to our website. I hope today's content can help you.
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