Geological Sciences

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Geological Sciences

机译：地质科学

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Crystal Lake, the 9th largest inland lake in Michigan, was a former embayment of proglacial Lake Algonquin (～11,000 ybp). It experienced a precipitous lowering of ～20 ft in 1873 during an attempt to build a slack-water canal to nearby Lake Michigan to promote settlement and resource development. A temporary dam across an intermittent outlet was washed away during a storm, and 21 miles of new beach was exposed for future development. This epochal event has been recreated using a QL2 LiDAR dataset (MiSAIL) to (1) assess current morphological features, (2) develop dynamic 3-D models of the watershed and surrounding area, and (3) reconstruct the magnitude of the original event. The drop in elevation, the surface area of the lake converted to beach; and the volume of water discharged down the Betsie River have been calculated. The paths of three canal routes have been traced on an overlay of the original 1873 project map and referenced to identified topographic features. Cross-sections of the canals have also been developed to facilitate comparisons of the most feasible route 144 years after the occurrence of this epochal event.

机译：水晶湖是密歇根州第9大内陆湖，曾是冰封的阿冈昆湖（〜11,000 ybp）的前身。在试图为附近的密歇根湖建造一条松弛水渠以促进定居和资源开发的过程中，它在1873年急剧下降了约20英尺。暴风雨过后，断断续续的出口上的临时水坝被冲走，并暴露了21英里的新海滩，以供将来开发。已使用QL2 LiDAR数据集（MiSAIL）重新创建了这个划时代的事件，以（1）评估当前的形态特征，（2）开发分水岭和周边地区的动态3-D模型，以及（3）重建原始事件的大小。海拔下降时，湖泊的表面积转换为海滩；并计算出贝齐河下游的水量。三条运河路线的路径已在原始1873年项目地图的覆盖图上进行了追踪，并参考了已识别的地形特征。运河的横断面也已经开发出来，以便于比较该划时代事件发生后144年的最可行路线。

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《Michigan Academician》 |2018年第3期|429-438|共10页
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