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一、基本情况永顺县位于湖南省的西北部,湘西土家族自治州的北部,在东经109°37′至110°18′,北纬28°43′至29°27′之间。地处云贵高原的东侧,鄂西山地和江南丘陵过渡地带的武陵山脉的西北。地势由西北向西南倾斜,海拔在119.4m 到1437.9m 之间。气候属亚热带暖湿季风气候,四季分明,雨量充沛。年均气温16℃左右,年平均降雨量1360毫米,分布不均,多集中在4—7月,夏季多暴雨,七月下旬至九月上旬出现干旱。近年来灾害性天气濒繁出现。1981年6月27日全县普降暴雨,雨量最大的九个公社日降雨量达220毫米至265毫米,一般地区也达110毫米至160毫米,是该县有资料记载以来最大的一次暴雨。由于暴雨的袭击山崩地塌,泥砂俱下,形成巨大的泥石流。全县被冲毁和淹没田土37285亩,达全县耕地面积的4.4%,冲坏房屋81栋,死亡15人。全县总面积3813平方公里,人口37万5千。人平均土地面积达1公顷,其中山地面积
First, the basic situation Yongshun County is located in the northwest of Hunan Province, western Hunan Tujia Autonomous Prefecture in the north, longitude 109 ° 37 ’to 110 ° 18’, latitude 28 ° 43 ’to 29 ° 27’ between. Is located in the eastern side of the Yunnan-Guizhou Plateau, western Hubei mountains and the transitional zone of the Wuling mountains northwest. The terrain from northwest to southwest tilt, elevation of 119.4m to 1437.9m. Climate is subtropical warm monsoon climate, four seasons, abundant rainfall. The average annual temperature is about 16 ℃, the annual average rainfall of 1360 mm, unevenly distributed, mostly concentrated in April-July, summer heavy rains, drought in late July to early September. In recent years, the brutal weather near the brink of emergence. On June 27, 1981, there were heavy rainfalls in the county, the nine communes with the highest rainfalls reaching 220 mm to 265 mm on a daily basis and 110 mm to 160 mm in the general area, the largest rainstorm ever recorded in the county. Landslides collapsed due to heavy rain and slush, forming a huge debris flow. The county was washed away and flooded 37285 acres of land, reaching 4.4% of the county area of cultivated land, destroyed 81 houses, 15 people died. The county a total area of 3813 square kilometers, population 375000. The average person covers an area of 1 hectare, of which the mountainous area