摘要
借助于GIS的空间分析功能 ,对路南石林巴江流域的地貌演化阶段进行了定量研究。研究表明 ,巴江喀斯特流域在经历了晚第三纪的夷平作用后 ,地形变得相对平坦 ,起伏较小 ,属典型的老年期地貌 ;在第四纪 ,由于构造抬升 ,使得流域中下游出现地貌回春 ,向壮年期逆向演化。此外 ,研究还表明 ,在计算流域地貌发育阶段的S值 (某一高程以上的高程的面积积分 )时 ,采用表面积和采用平面投影面积计算出的结果差别微小 ,不足以对最终的结论产生影响。因此 ,借助于GIS来揭示流域地貌发育问题 ,不但操作简单、精度高 ,而且速度快、效率高 ,结果也令人满意。
The paper, by the means of the spatial analysis function of GIS, makes a quantitative research on the stage of geomorphologic evolution in Bajiang drainage basin. The research demonstrates that, after being leveled in the Neocene period, the landform in Bajiang drainage basin becomes relatively smooth and less undulant, and is in the aged stage. However, in the Quaternary period, geomorphology at the middle and down reaches of the stream was rejuvenated and began evolving backward to the stage of maturity due to the geological uplift. Moreover, the research done in Bajiang area also indicates that the calculated result almost can not be influenced obviously either by the adoption of planimetry area or by the adoption of surface area when the value of ' S ' of the evolutional stage of the drainage basin is calculated. Meanwhile, with the help of GIS, the problems of geomorphologic evolution of drainage basin can be solved with simple operation, high precision, rapid speed, high efficiency and satisfying results.
出处
《中国岩溶》
CAS
CSCD
2002年第2期89-94,共6页
Carsologica Sinica
基金
石林研究基金资助项目 (2 0 0 0 - 0 7)
