| 鄂尔多斯西北缘桌子山地区河流袭夺和分水岭迁移研究 |
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| 引用本文： | 林玲玲,李雪梅,张会平,马字发.鄂尔多斯西北缘桌子山地区河流袭夺和分水岭迁移研究[J].地质力学学报,2021,27(2):294-303. |
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| 作者姓名： | 林玲玲 李雪梅 张会平 马字发 |
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| 作者单位： | 中国地震局地质研究所, 地震动力学国家重点实验室, 北京 100029;防灾科技学院, 河北省地震动力学重点实验室, 河北三河 065201;中国科学院成都山地灾害与环境研究所, 成都 610041;中国地震局地质研究所, 地震动力学国家重点实验室, 北京 100029 |
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| 基金项目： | 国家自然科学基金项目（41761144071）；科技部第二次青藏高原综合科学考察研究项目（2019QZKK0704）；廊坊市科技局科学研究与发展计划自筹经费项目（2019013086） |
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| 摘 要： | 分水岭是水系演化中的动态因素，通过连续或不连续的水系袭夺而发生迁移，从而导致水系重组。传统的对水系演化的研究主要集中单个河流袭夺事件，而新提出的利用分水岭两侧chi（χ）值差异来描述分水岭的动态迁移过程，能够解释大尺度的河流袭夺事件，描述水系的整体演化过程。文章基于12.5 m DEM数据提取了鄂尔多斯西北缘桌子山地区的chi（χ）值揭示其空间分布具有东高西低的特点，反映桌子山的分水岭处于向东迁移过程。综合分析进一步揭示，在桌子山东西两侧的构造升降和降水条件都无明显差异的条件下，岩性抗侵蚀能力差异是控制桌子山分水岭向东迁移的主要因素，当抗侵蚀能力更强的寒武系、奥陶系灰岩位于背斜西翼，而中元古宙长城系（Pt）沉积碎屑岩位于其下部时，背斜西翼的河流具有更强的侵蚀能力，西翼河流可能会穿过背斜核部，从而侧向袭夺东侧的河流。
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| 关 键 词： | 河流袭夺 分水岭迁移 鄂尔多斯 桌子山 |
| 收稿时间： | 2020/12/1 0:00:00 |
| 修稿时间： | 2021/2/24 0:00:00 |
River capture and divide migration of the Zhuozishan area in the northwestern margin of the Ordos Block |
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| LIN Lingling,LI Xuemei,ZHANG Huiping,MA Zifa.River capture and divide migration of the Zhuozishan area in the northwestern margin of the Ordos Block[J].Journal of Geomechanics,2021,27(2):294-303. |
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| Authors: | LIN Lingling LI Xuemei ZHANG Huiping MA Zifa |
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| Institution: | 1.State Key Laboratory of Earthquake Dynamics, Institute of Geology, China Earthquake Administration, Beijing 100029, China2.Hebei Key Laboratory of Earthquake Dynamics, China Institute of Disaster Prevention, Sanhe 065201, Hebei, China3.Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, China |
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| Abstract: | Divide is a dynamic feature of a landscape that routinely migrates,either through progressive or discrete river capture,in some cases even leading to the complete reorganization of river networks.Most of the existing geomorphological or drainage evolution studies focus on the single river capture,and few report on the overall movement and the geomorphologic adjustment of divide.Recently,it was proposed in a digital study of fluvial geomorphology that the chi(χ)value difference on both sides of the drainage divide could be used to explain the large-scale river capture and demonstrate the reorganization of drainage when describing the dynamic migration process of divide.In this paper,the chi(χ)values were calculated using the 12.5 m DEM data.The chi(χ)values were higher in the east and lower in the west,indicating an eastward migration.The lithological erosion resistance is the main factor controlling the eastward migration of the divides in Zhuozishan under the condition that there are no obvious differences in the tectonic uplift and precipitation conditions on the east and west sides.When the Cambrian and Ordovician limestones with stronger erosion resistance lie in the west wing of the Zhuozishan anticline,the other weak sedimentary clastic rocks located in its lower part,the river in the west wing would be through the core of the anticline,laterally capturing the rivers on the east of the anticline. |
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| Keywords: | river capture divide migration Ordos Zhuozishan |
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