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1 引言沈阳地区位于辽宁省中北部,属中温带受季风影响的半湿润大陆性气候。该地区地貌类型多样,东北和西南紧靠长白山余脉千山山脉,属低山丘陵,中西部是辽阔平原地貌由东北向西南倾斜。全地区有大小河流15余条,大部向西南的辽中、新民等地汇集再出境入海,上游是旱坡地,而且林地的森林覆盖率较低。1995年7～8月,沈阳地区连降大雨,达658.3mm,相当于27a的全年平均降雨量的总和,造成百年不遇的特大洪水,致使平原地区大片农田被淹达20d左右,面积达6.67×10~5hm~2。这次洪水源于天然降雨并汇集上游地区地表径流而形成的,水体混浊,悬浮物
1 INTRODUCTION Shenyang is located in the central north of Liaoning Province and belongs to a sub-humid continental climate with temperate monsoon in the temperate zone. Geomorphological types of the region varied, the Northeast and Southwest close to the Changbai Mountain Veins Qianshan Mountains, is a hilly, the Midwest is vast plain landscape from northeast to southwest tilt. There are more than 15 large and small rivers in the whole region, and most of them converge and re-enter the sea into Liaozhong and Xinmin in the southwest. The upper reaches are dry slopes, and the forest coverage in the woodlands is relatively low. From July to August 1995, heavy rains continued in Shenyang, reaching 658.3mm, equivalent to the sum of the annual average rainfall of 27a, causing major floods not seen in a hundred years. As a result, a large area of farmland in the plain area was flooded for about 20 days with an area of 6.67 × 10 ~ 5hm ~ 2. The flood from the natural rainfall and bring together the upper reaches of the surface runoff and the formation of water turbidity, suspended solids