【摘要】 河流地貌形态定量研究是了解构造活动与地表过程耦合作用的重要途径之一。霍山山脉位于山西地堑系中部,介于临汾盆地和太原盆地之间,以发育霍山山前断裂带和1303年洪洞M_S8级地震而著名,通过分析跨断裂带及周边的48条河流的纵剖面形态、SL参数、Hack剖面、面积高程积分曲线以及HI值等,得到以下认识:1)跨断裂带的河流,其纵剖面在断层两侧的形态具明显差异,反映其受断层活动控制,而其他河流,除极少部分在上游存在局部陡变外,纵剖面为近似下凹的指数曲线形态显示近均衡状态;2)河流的HI值及积分曲线显示了霍山地区新生代以来整体处于强抬升弱侵蚀状态,即所有河流均处于壮年或幼年期;3)48条河流一致上凸的Hack剖面也表明霍山地区新生代以来处于强烈的构造抬升阶段,跨断裂带的Hack剖面形态以陡变下降而区别与其他河流的近似圆弧形;4)跨断裂带河流的SL/K参数在断层附近出现异常高值,反映了SL/K参数与断层垂直差异运动的相关性,周边其他河流的SL/K参数反映了没有差异运动的准均衡状态,局部的异常高值可能对应不同基岩的抗风化能力差异。河流地貌定量参数与构造环境存在显著的相关性,河流地貌定量参数特征揭示霍山山前断裂带在新生代以来的强烈垂向运动特征。更多还原

【Abstract】 The quantitative study of river geomorphology is very important to understand the interaction between tectonic and surface processes.Mts.Huoshan,located in the middle of the Shanxi graben system,between Linfen basin and Taiyuan basin,has uplifted to 1500m because of the normal faulting of the Huoshan Piedmont Fault Zone(HPFZ) on the west foot slope of the mountains,is also famous for happened the 1303 Ms8.0 earthquake.Our studies on a series of quantitative fluvial geomorphic parameters,such as longitudinal profile style,stream length-gradient index(SL index),standard stream length-gradient index(SL/K index),Hack profile,hypsometric integral curves and its values(HI),etc.of selected 48 rivers around the Mts.Huoshan,across and not across the HPFZ,allow us to summarize the following general points:(1)To the rivers across the HPFZ,the longitudinal profiles of upstream and downstream,divided by the fault,show significantly different from each other,demonstrating obvious characteristics controlled by fault activity,to the other ones,the longitudinal profiles performance an approximate exponential curve,showing a near-equilibrium.(2)The HI values and Hypsometric integrate curves of all river basins indicate that all the rivers are in the prime of life or childhood,that is,Mts.Huoshan is in the state of strong uplift and weak erosion overall in Cenozoic era.(3)Convex Hack profiles of all rivers also shows that Mts.Huoshan is in the stage of intense tectonic uplift in the Cenozoic,while Hack profile of rivers across the HPFZ with sudden decreased change shape unlike the approximate arc-shaped of the other ones.(4)The river segments with abnormally high SL/K values are usually corresponded to the normal faulting,while random appearance of high SL/K values on the other rivers corresponds to the bedrock with weathering differences.There is a significant correlation between quantitative river geomorphic parameters and tectonic environment,these parameters of rivers across HPFZ shows the normal faulting of the Huoshan piedmont fault zone during Cenozoic.更多还原