中国的江河湖泊众多,流域面积在1000km~2以上的河流约有1500多条,水面大于100km~2的湖泊有130个。全国高山冰川面积约5万多km~2,冰川总贮量约5×10~2m~3,年补给河川的融水约0.05×10~2m~3。全国河川多年平均径流量约2.7×10~2m~3,地下水补给约0.82×10~2m~3,扣除河川径流量与地下水 There are a large number of rivers and lakes in China, with more than 1,500 rivers with a catchment area above 1000km 2 and 130 lakes with a water surface greater than 100km 2. The total area of ​​glaciers in the country is about 50,000 km 2 and the total glacier reserves are about 5 × 10 -2 m 3. The annual recharge of the rivers is about 0.05 × 10 -2 m 3. The annual average runoff of rivers in the country is about 2.7 × 10 ~ 2m ~ 3, and the recharge of groundwater is about 0.82 × 10 ~ 2m ~ 3. After deducting the runoff of river and groundwater