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1城市防汛突发事件类型及其主要影响北京位于华北平原的西北端,地形西北高、东南低,西部、北部和东北部群山环绕,形成平均高程约为1000m的弧形天然屏障,东南最低处高程不足10m。地貌呈由西向东,由北向南,由中山、低山、丘陵过渡到洪冲积台坡地和平原。气候四季分明,呈现暖温带半干旱半湿润地区典型的大陆性季风气候特征。
1 Types of Urban Flood Control Incidents and Their Major Impacts Beijing is located on the northwestern tip of the North China Plain. The terrain is surrounded by northwest high, southeast low, western, northern and northeastern mountains, forming an arc-shaped natural barrier with an average elevation of about 1000m and the southeast minimum Elevation less than 10m. Landform from west to east, from north to south, from Zhongshan, low mountain, hilly transition to Hong alluvial plot slope and plain. The climate is characterized by four seasons with typical continental monsoon climate characteristics in warm temperate semi-arid and semi-humid areas.