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一、西北地区概况西北地区疆域辽阔,人口稀少,包括新疆、青海、宁夏、甘肃、陕西的全部和内蒙古的西部地区。总面积384.6万km,占全国国土面积的35%左右。西北地区位于亚欧大陆腹地,夏季暖湿气流难以到达,冬季受西伯利亚干冷气候影响强烈。因此,降水稀少、蒸发强烈、夏季炎热、冬季寒冷。年降水量由东向西逐渐递减,水资源年际、年内变化大,受季风气候影响严重。地表径流主要集中在汛期,汛期径流量一般占全年径流量的60%以上。二、西北地区水资源及其特点(第一小组)
First, the overview of Northwest China’s vast territory in the northwest, sparsely populated, including Xinjiang, Qinghai, Ningxia, Gansu, Shaanxi and western Inner Mongolia. The total area of 3846000 km, accounting for about 35% of the country’s land area. Northwest China is located in the hinterland of Eurasian continent, the summer warm and humid air flow is difficult to reach, the winter is strongly affected by Siberian dry and cold climate. As a result, there is scarce precipitation, strong evaporation, hot summers and cold winters. The annual precipitation gradually decreases from east to west. The annual change of water resources during the year has been greatly affected by the monsoon climate. Surface runoff is mainly concentrated in the flood season, flood season runoff generally accounts for more than 60% of the annual runoff. Second, the water resources in Northwest China and its characteristics (the first group)