龙川江为金沙江南岸一级支流,水源丰富,发源于楚雄彝族自治州的南华县天子庙坡东侧鱼肚拉的蒲藻塘,由西向东流经南华县、楚雄市,又折向北进禄丰县和元谋县,横穿元谋坝区,最终在元谋北部的江边乡汇入金沙江。流域面积9240.7平方千米,全长约246千米。发源处与入江口相对落差1600多米,河床平均坡降为4.8‰,流域平均海拔1992米。流域以山区和丘陵为主,占95%,河谷盆地和浅丘约占流域面积的5%。
龙川江盆地是造山带内部发育的新生代小型山间断陷盆地。
Longchuanjiang basin is a small Cenozoic intramontane down-faulted basin.
此外,元谋县强烈的冲沟侵蚀也是龙川江输沙量增加的重要原因之一。
Furthermore, the intensive gully erosion is another important inducement of the increase of sediment yields in Longchuan River.
龙川江盆地是滇西主要的铀矿赋矿盆地之一,现已探明一批砂岩型铀矿床。
The Longchuanjiang basin is one of the main uranium-hosting basin in western Yunnan, and a series of sandstone-type uranium deposits have been explored up to now.
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