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首页> 外文期刊>Michigan Academician >Shore Protection and Coastal Change on the Lake Michigan Shore: Duck Lake, Orchard Beach State Park, and Onekama, Michigan
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Shore Protection and Coastal Change on the Lake Michigan Shore: Duck Lake, Orchard Beach State Park, and Onekama, Michigan

机译：密歇根湖岸边的海岸保护和海岸变化：鸭湖，果园海滩州立公园和密歇根州奥涅卡马

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A high resolution beach profile change monitoring program was conducted during generally high water in the 1990s at three sites along the eastern shore of Lake Michigan in a variety of coastal geological settings to evaluate an experimental shore protection technology called the Undercurrent Stabilizer System™. Shore protection structures at all three sites produced minimal negative impact at and immediately adjacent to the study sites and generally resulted in significant net accretion of near-shore sediment in and around the structures during the study period compared to control sites. Local complexities and variations in coastal processes and conditions (especially local longshore transport, coastal substrates and geological setting, and other existent engineered structures) play a critical role in the specific performance characteristics of these small (property owner) scale shore protection structures in the Great Lakes region. A fundamental factor in the evaluation of coastal change associated with shore protection on eastern Lake Michigan (as well as many other areas of the Great Lakes) is that net transport of sand is offshore, especially during periods of prolonged high water levels. Maintenance of long-term sediment budgets through input of beach-grade sand is dependent on the erosion of upland (bluff/dune materials) or nourishment. The use of coastal monitoring results for coastal planning, development, and permitting decisions requires careful consideration of several factors: the intent of the monitoring project in terms of spatial scale and time frame of influence of the structures that are monitored and the appropriateness of extrapolating monitoring results to other areas with substantially different coastal setting. Although the overall results of the study indicate that no substantial negative impact occurs within the experimental structure study sites compared to control sites, we believe that the isolation and protection of back-shore coastal sediments from wave action through the use of any shore protection technology will ultimately result in increasing offshore loss of near-shore sand throughout the eastern Lake Michigan coastal system.
机译：在1990年代普遍高水期间，在密歇根湖东岸的三个地点的各种沿海地质环境中，进行了高分辨率的海滩剖面变化监测程序，以评估一种称为“暗流稳定器系统”的实验性岸上保护技术。与研究地点相比，所有三个地点的海岸保护结构在研究地点及其附近均产生最小的负面影响，通常在研究期间导致建筑物内外的近岸沉积物净增加。沿海地区的复杂性和变化（特别是当地的沿岸运输，沿海底物和地质环境，以及其他现有的工程结构）在这些大的（财产所有者）规模的海岸保护结构的具体性能特征中起着至关重要的作用。湖泊地区。评估与密歇根州东部湖（以及大湖区许多其他地区）的海岸保护相关的沿海变化的一个基本因素是，沙子的净运输是在海上，尤其是在长时间的高水位期间。通过输入海滩级沙子来维持长期的沉积物预算取决于山地的侵蚀（虚张声势/沙土物质）或养分。使用沿海监测结果进行沿海计划，开发和许可决策需要仔细考虑以下几个因素：监测项目的意图，即受监测结构影响的空间规模和时限，以及推断监测的适当性结果到沿海地区有很大不同的其他地区。尽管研究的总体结果表明与对照组相比，实验结构研究区内没有发生重大的负面影响，但我们相信通过使用任何海岸保护技术，隔离和保护沿海近海沉积物免受波浪作用最终导致整个密歇根湖东岸沿海系统的近岸沙子在海上的损失增加。

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