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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Divergent evolution in fluviokarst landscapes of central Kentucky
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Divergent evolution in fluviokarst landscapes of central Kentucky

机译：肯塔基州中部潮汐岩溶景观的发散演变

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摘要

Central Kentucky is characterized by a mixture of karst and fluvial features, typically manifested as mosaic of karst-rich/channel-poor (KRCP) and channel-rich/karst-poor (CRKP) environments. At the regional scale the location and distribution of KRCP and CRKP areas are not always systematically related to structural, lithological, topographic, or other controls. This study examines the relationship of KRCP and CRKP zones along the Kentucky River gorge area, where rapid incision in the last 1.5 million years has lowered local base levels and modified slopes on the edge of the inner bluegrass plateau. At the scale of detailed field mapping on foot within a 4 km~2 area, the development of karst and fluvial features is controlled by highly localized structural and topographic constraints, and can be related to slope changes associated with retreat of the Kentucky River gorge escarpment. A conceptual model of karst/fluvial transitions is presented, which suggests that minor, localized variations are sufficient to trigger a karst-fluvial or fluvial-karst switch when critical slope thresholds are crossed.
机译：肯塔基州中部的特点是岩溶和河流相混合，通常表现为富含岩溶/河道贫瘠（KRCP）和富含河道/岩溶差（CRKP）的环境。在区域范围内，KRCP和CRKP区域的位置和分布并不总是与结构，岩性，地形或其他控制系统相关。这项研究研究了肯塔基河峡谷地区的KRCP和CRKP地区之间的关系，在过去的150万年中，快速切开降低了当地基层水位，并改变了蓝草高原内缘的坡度。在4 km〜2区域内步行进行的详细野外制图的规模上，岩溶和河流特征的发育受高度局限的结构和地形约束的控制，并且可能与肯塔基河峡谷悬崖退缩相关的坡度变化有关。 。提出了岩溶/河流过渡的概念模型，该模型表明，当超过临界坡度阈值时，局部的微小变化足以触发岩溶-河流或河流-岩溶转换。

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