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采用基于 3S技术的定量遥感方法 ,对 1998年和 1999年金沙江一级支流龙川江上游小流域进行了水土流失动态监测和防治决策分析。结果表明 ,1999年为涝年 ,侵蚀总量高达 86 90 0 8.97t,强度及其以上侵蚀级别的侵蚀量占总量的 86 .39% ,侵蚀模数平均为 770 3.87t/km2 。 1998年为旱年 ,流失情况较 1999年的轻微。 1999年中度及其以上侵蚀级别的侵蚀面积占流失总面积的 32 .41% ,而 1998年只占 2 6 .0 9%。 1999年需要治理和急需治理的面积占侵蚀总面积的 15 .45 %和 0 .82 % ,而 1998年的治理面积较低。本研究采用的技术在国内具有先进性和快速、准确、经济等优点 ,在云南山地有广阔的运用推广前景
Using the quantitative remote sensing method based on 3S technology, the dynamic monitoring and prevention and control decision-making of soil and water loss in the upper reaches of the Longchuanjiang River, a first-order tributary of the Jinsha River in 1998 and 1999 were analyzed. The results showed that in 1999, the total erosion amount was 86 90 0 8.97t in the year of flood, and the erosion amount of erosion and above accounted for 86.39% of the total. The average erosion modulus was 770 3.87t / km2. 1998 was dry year, with less loss than in 1999. Eroded areas of medium and above erosion levels in 1999 accounted for 32.41% of the total area lost, compared to 26.90% in 1998. The areas under governance and in urgent need of treatment accounted for 15.45% and 0.82% of the total area eroded in 1999, while the area under governance was relatively low in 1998. The technology used in this study is advanced, fast, accurate and economical in China. It has a broad prospect of applying and popularizing in mountainous areas of Yunnan