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岱海流域地貌演化及其对断裂活动性的指示意义

, PP. 310-318

Keywords: 数字高程模型(DEM),地貌演化,高程-面积分析法,水系分支比,断裂活动性

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Abstract:

以戴维斯的地貌侵蚀循环学说为基础,运用SRTM-DEM数据、高程-面积分析法和水系分支比研究流域地貌发育。首先运用Rivertools软件平台从DEM数据中提取岱海流域内独立的11个小流域,其中7个位于蛮汉山山前断裂北侧的山地中,另外4个位于盆地南缘断裂南侧的山地中;然后计算每一个流域单元的高程-面积积分值和水系分支比。北侧7个小流域积分值为0.567~0.324,从西向东总体上呈现减小的趋势;南侧4个小流域积分值为0.373~0.425,数值之间比较接近。北侧7个小流域水系分支比的为2.079~2.628,从西向东总体上呈现增大的趋势;南侧4个小流域的水系分支比为2.066~2.138,数值之间比较接近。高程-面积分析法和水系分支比分析表明,北侧7个小流域均反映蛮汉山山前断裂的活动性从西向东逐渐减弱的趋势;南侧的4个小流域均反映岱海南缘断裂沿由西向东的活动性没有明显的变化。北侧7个流域高程-面积积分值与水系分支比之间存在明显的负线性相关;两种指标综合成的主因子的变化范围是1.337~-1.699,从西向东呈现出明显降低的趋势。多种分析方法均表明,蛮汉山山前断裂从西向东活动性有减弱的趋势,而岱海南缘断裂从西向东活动性变化不大。

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