Survey of Warnimont Bluff, Wisconsin, December 2019

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 ~100 m long extent of unconsolidated coastal bluffs on Lake Michigan.

高水位湖泊正逐渐缩减密歇根湖沿岸的沙滩面积，并使得波浪侵蚀作用以过去30年之最的速度破坏海岸悬崖的基础。根据沉积物预算计算，悬崖侵蚀是沙粒和砾石大小颗粒进入沙滩及近岸系统的主要来源。研究者们发现，浅层至中层深度滑动式滑坡是悬崖侵蚀的主要原因。因此，估计湖泊沉积物预算取决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中沉积物贡献的组成。该数据集是记录密歇根湖约100米长的非固结海岸悬崖随时间变化的一系列重复调查的一部分。