Survey of Sheboygan Bluff, Wisconsin, May 2018

High lake levels are reducing beach area along the Lake Michigan coastline and allowing wave action to erode the bases of coastal bluffs at the highest rate of the past 30 years. Sediment budget calculations have shown that bluff erosion is the dominant source of sand and gravel-sized particles that are mobilized into beaches and the nearshore system. Researchers have found that the leading cause of bluff erosion is shallow to intermediate depth translational landslides. Therefore, estimating lake sediment budgets depends on an understanding of the mechanisms that lead to landslide failure. This study will provide a comprehensive analysis of bluff stability for bluffs affected by landslide failure coupled with an analysis of bluff composition to determine the composition of sediment contributions of coastal bluffs to the southeast Lake Michigan sediment budget. This dataset is part of a series of repeat surveys documenting temporal changes to a 0.5 km extent of unconsolidated coastal bluff on Lake Michigan.

高湖水位正在减少密歇根湖沿岸的沙滩面积，并允许波浪作用以过去30年中最高的速度侵蚀海岸悬崖的基础。沉积物预算计算表明，悬崖侵蚀是导致沙滩和近岸系统中移动的沙粒和砾石大小颗粒的主要来源。研究人员发现，悬崖侵蚀的主要原因是浅层至中等深度的滑动式滑坡。因此，估算湖泊沉积物预算依赖于对导致滑坡失败的机制的理解。本研究将对受滑坡破坏影响的海岸悬崖的稳定性进行全面分析，并结合对悬崖组成的分析，以确定海岸悬崖对东南密歇根湖沉积物预算的沉积物贡献组成。该数据集是记录密歇根湖0.5公里范围内非固结海岸悬崖随时间变化的一系列重复调查的一部分。