太行山地貌计量指标空间特征及其构造地貌意义

系统的地貌计量指标分析有助于理解造山带新构造活动特征与地貌演化。太行山地处中国第二、三地形阶梯的边界，具有重要的构造地貌意义。基于ASTER GDEM地形数据，对太行山按流域进行了面积高程积分、河长坡降指标（SL）和Hack剖面等地貌计量指标的分析，结合地层、构造等资料，探讨了太行山构造地貌演化特征。结果表明，在分析的11条河流中，7条河流的面积高程曲线（HC）呈S形，面积高程积分值（HI）在0.35~0.60之间，表明其地貌演化处于壮年阶段，4条河流的HC呈凹形，HI值小于0.35，表明其地貌已遭受强烈侵蚀改造，目前处于地貌演化的老年阶段；7条河流的Hack剖面呈上凸形态，均衡坡降指标值（K）偏高，表明流域所在区域新构造活动较为活跃，4条河流的Hack剖面近似直线，K值偏低，表明河流所在区域新构造活动性较弱；从整体上看，太行山的HI平均值为0.36，HC为接近凹形的S形，表明太行山地貌演化整体上处于"壮年期"向"老年期"过渡阶段；太行山新构造活动性（断裂活动）在空间上存在差异性，东部活动性较强，西部地区活动性相对较弱。 

Spatial characteristics of quantitative geomorphic indices in the Taihang Mountains, north China: Implications for tectonic geomorphology

Tectonic geomorphology focuses on the coupling relationship between tectonics and surface processes,as well as their influence on topographic evolution.Spatial analysis techniques based on digital elevation model(DEM)and geographic information system(GIS)have gradually become one of the quantitative methods of tectonic geomorphologic study.The Taihang Mountains is located at the boundary of China’s second and third topographic steps,and has important tectonics and geomorphological significance.However,at present,there are still few studies on the relationship between topographic evolution status of the Taihang Mountains and geological tectonics.Based on the ASTER GDEM data(30 m×30 m)and GIS spatial analysis method,we selected the elevation,slope,hypsometric integral,stream length-gradient index SL and Hack Profile of river slopes in the mainstream of the Taihang Mountains for analysis.Combining with the lithology and tectonics,we discussed the regional landform evolution status of the Taihang Mountains.The results show that,among the 11 rivers analyzed,the HC of 7 rivers is S-shaped,the HI between 0.35 and 0.60,indicating that the geomorphy is in the prime of evolution,while that of the other 4 rivers is concave,HI less than 0.35,indicating strong erosion and destruction effect in the old age.The Hack profiles of 7 rivers are up-convex with relatively high K value,demonstrating the relatively active regional neotectonic activity,while that of the other 4 rivers are approximately straight with low K value,demonstrating the weak regional neotectonic activity.On the whole,the average HI of the Taihang Mountains is 0.36,and the HC is nearly concave S-shaped.The geomorphological evolution of this area is generally in the transitional stage from the“prime age”to the“old age”.The neotectonic activity(fault activity)of the Taihang Mountains shows difference in space,with strong activity in the east and relatively weak activity in the west.