Why did the March floods in India occur in the north?

Judging from the third question of Fujian Senior Three Quality Inspection on 20 19, the floods in India in March were mostly in the north, and I don't think there will be any floods in the north of India in March.

As we all know, most parts of India have a tropical monsoon climate, with precipitation concentrated from June to165438+1October. March is the dry season in India, with little precipitation. In March, atmospheric precipitation has little supply to rivers, but there will be snow and ice melting in India in March, and the snow and ice melting period in India mainly begins from March to June. At this time, due to the northward shift of the direct point of the sun, the temperature in northern India gradually increased. In some low-altitude areas, ice and snow began to melt, leading to melting water. The proponent just grasped this point and thought that most of the floods in India occurred in the north of March. But when you think about it, the rivers in India are in the dry season in March, and the water level of the river is extremely low. But it is impossible and will not be caused by meltwater at low altitude, and northern India is hundreds of kilometers away from the Himalayas. It is unrealistic to let the water level of Indian rivers soar in March and cause floods unless the Himalayas begin to melt in February. Moreover, the Ganges Plain in northern India is one of the most densely populated places in India, and the demand for water is huge. However, at low altitudes, meltwater from snow and ice may not be enough to meet the demand for water, let alone cause floods. In March, with the temperature rising, there was little precipitation, low soil water content and increased evaporation in India for several months. In the process of melting snow and ice flowing through India, the influence of infiltration and evaporation should be considered. In addition, in the low altitude areas of the Himalayas, the vegetation coverage rate is high. Although northern India is the Ganges Plain, with flat terrain and poor drainage, the water melted by ice and snow is far from enough to cause floods, and there are natural and man-made reasons, and it is even less likely to cause floods. On the other hand, in southern India, although the southwest monsoon has not yet arrived in March, it is impossible to rely on the southwest monsoon to form a large amount of precipitation. However, March is a hot season in southern India, and updrafts prevail. In the southern part of Deccan Plateau, strong convective weather is easy to form due to terrain reasons, and short-term heavy precipitation is one of the most common strong convective weather. Dark clouds covered the sun and the rain poured down. After a while, huge precipitation poured out. Because short-term heavy precipitation will bring about a surge in surface runoff and cause various disasters in different regions. In cities, short-term heavy precipitation is easy to cause waterlogging in cities, hinder traffic and even endanger the lives of residents in low-lying areas. In areas with fragile geological conditions, short-term heavy rainfall is a "catalyst" for disasters such as mountain torrents, mudslides and landslides, which seriously threatens the lives and property of local residents.

And with the passage of time, the soil water content gradually increases, and the infiltration of surface runoff decreases. The place where strong convective weather occurs is mainly located in Deccan Plateau, where, like Ganges Plain, the drainage is not smooth. Compared with the Ganges Plain, I think it is more prone to floods.