拉孜地形,地貌概况及其形成原因

2025-04-08 04:56:55
推荐回答(1个)
回答(1):

  拉孜县位于西藏自治区西南部,念青唐古拉山西部,处于东经87°24′-88°22′,北纬28°47′-29°37′之间,东连萨迦县,西南接定日县,西靠昂仁县,北邻谢通门县。拉孜县历史悠久,地域开阔,交通便利,是日喀则市西部七县必经之要塞,国道318线即中尼(中国--尼泊尔)公路贯穿拉孜南部,拉叶(拉孜--新疆叶城)公路即219国道由县辖查务乡驻地起始并与318国道相连,向西北可经阿里至新疆叶城,两条国道在本县境内总长122公里。县驻地区下镇东距日喀则市150公里,经日喀则至拉萨430公里,西南距樟木口岸370公里,是日喀则西部大县之一。
  折叠气候环境
  拉孜县拉孜县高原奇特多样的地形,地貌和高空空气环流等诸多因素的影响,形成了日照强烈,气温较低,温差大,雨水集中,干湿明显,冬春季少雨雪多大风的气候特点。五年气候可分为冬半年、夏半年、冬不太冷、夏不太热、日变化天、年变化小,春秋季气温升降缓慢,雨热同季,燥旱同季,冬春干燥且多大风,年平均气温为7.0℃。绝对最高气温28.2℃,极端最低气温-25.1℃。因高原奇异多变,气候、降雨量极不稳定,1980年降水量最多,达355.1毫米,1982年降水量最少,史有122.9毫米,全年降水百分之九十集中在6月至9月份,年降水天数平均为70天,日最大降水量为36.5毫米,冬春季节干旱严重,极不降雨雪,全年最多风向为南风,多集中在当年十月至次年四月中旬,年平均风速为3.1m/s,最大风速曾达20米/秒,由于年日照时数高,风多风大,降水偏少,气候极为干燥,相对温度只有百分之四十,而空气温度仅为百分之十四。
  常见的自然灾害有旱灾,霜灾、雹灾、虫灾、洪涝灾等, 拉孜县此外还有地震,泥石流等少见而危害特大的自然灾害。旱灾为危害性最大的自然灾害,每年因雨季到来晚,影响适时播种和庄稼幼苗生长,造成粮油减产,农民减收。冰雹和霜冻对农作物造成严重危害,平均每年受雹灾和霜灾面积约为2.3万亩,损失粮油300万斤至500万斤,对牧业生产威胁最严重的是春雪灾和冻寒。

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