2014年6月16日星期一

Surface water resources

Chinese name : Name of surface water resources : surface water resources definitions: some time and space Mainland table dynamic water body of water. Applied sciences : Resource Technology (a subject) ; Water Resources Studies ( two subjects )

surface water resources

surface water resources

surface water resources refers to the amount of surface water can be updated annually freshwater . Is an important part of the water resources . Including snow and ice water , river water and lake water . Their number is usually said to restore natural river runoff . Because there is some connection between surface water and groundwater , water resources assessment must be less groundwater recharge that part of the river water .

surface water distributed in the Earth 's surface water bodies , such as oceans, rivers , lakes , swamps , glaciers , snow . Surface water as water resources , the implementation of human control land , water regulation water allocation and scientific management .

from a water supply point of view , the surface water resources mainly refers to the occurrence of water in the rivers and waters from the perspective of shipping and aquaculture , surface water resources ; energy use point of those occurrence in freshwater rivers, lakes and glaciers ; in terms of surface water resources drop river runoff .

According to theoretical estimates , the global surface water a total of 1.4 billion cubic kilometers . Which ocean 1.37 billion cubic kilometers ; rivers 1700 cubic kilometers ; 125,000 cubic kilometers of freshwater lakes and reservoirs ; glaciers and permanent snow cover 030 million cubic kilometers of water . [1]

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