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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Lacustrine shore platforms at lake waikaremoana, north island, new zealand
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Lacustrine shore platforms at lake waikaremoana, north island, new zealand

机译：新西兰北岛怀卡雷莫阿纳湖的Lacustrine岸台

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This paper examines the morphology and processes governing the development of shore platforms at Lake Waikaremoana, North Island, New Zealand. Shore platforms at Lake Waikaremoana are recent features, and were formed when a new sequence of shoreline development was initiated, due to lowering of the lake by 5 m in 1946 for hydroelectric power development. Three predominant platform morphologies were identified around the lake. These include gently sloping platforms (c. 1.5 to 3.9°), ramp platforms (c. 6.8 to 9.2°), and concave ramp platforms (c. 7.9 to 12°). Platform widths ranged from 11 to 31 m, with the gently sloping platforms characterized by the widest morphologies. Erosion rates were estimated using perched sandstone boulders and were found to range from 3.4 to 12.5 mm a~(-1), with a mean erosion rate of 5.9 mm a~(-1). Higher rates of erosion were identified at lower platform elevations, due to a greater frequency of wetting and drying cycles coincident with storm waves, while lower erosion rates were identified at higher elevations. Field evidence suggests that shore platforms at Lake Waikaremoana were likely initiated and continue to develop as a result of subaerial wetting and drying cycles. Waves, coincident with fluctuating lake levels, play an important role by removing the weathered material from the platforms, and appear to control the width of the platforms. A conceptual model of platform development is presented, and analogies are drawn between this model, and the formation of shore platforms in oceanic environments.
机译：本文研究了支配新西兰北岛怀卡雷莫阿纳湖岸平台发展的形态和过程。 Waikaremoana湖的岸台是最近的特征，是在新的海岸线开发计划启动时形成的，这是由于1946年将湖降低了5 m进行水力发电开发的缘故。在湖周围发现了三种主要的平台形态。其中包括平缓倾斜的平台（大约1.5至3.9°），倾斜平台（大约6.8至9.2°）和凹形倾斜平台（大约7.9至12°）。平台宽度从11到31 m，平缓倾斜的平台以最宽的形态为特征。使用栖息的砂岩巨石估算侵蚀速率，发现侵蚀速率为3.4至12.5 mm a〜（-1），平均侵蚀速率为5.9 mm a〜（-1）。在较低的平台高度处确定较高的侵蚀速率，这是由于与风暴波同时发生的润湿和干燥周期的频率较高，而在较高的高度处确定较低的侵蚀速率。实地证据表明，由于地下湿润和干燥周期的缘故，怀卡雷莫阿纳湖的海岸平台很可能已经开始并继续发展。与波动的湖泊水位相吻合的海浪通过从平台上去除风化的物质起着重要作用，并且似乎控制着平台的宽度。提出了平台开发的概念模型，并在此模型与海洋环境中海岸平台的形成之间进行了类比。

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