ISMSE Approximate Landward Tideland Jurisdiction (2021)

Features represent the most landward high water line for the area as mapped from historical and contemporary sources. This dataset contains an updated version of the presumptive lines of Commonwealth of Massachusetts tidelands jurisdiction, pursuant to Chapter 91 and the Waterways Regulations (310 CMR 9.00). The Public Waterfront Act enacts public trust requirements on tidelands that were historically located below the high water line or that are currently located below the high water line. This dataset incorporates a more recent contemporary mean high water line into the existing Massachusetts Chapter 91 Mapping Project datalayers. The update is based on the 2021 mean high water line as depicted in the geodatabase feature class Tidal_Shorelines_2021, Please note in areas of contemporary marsh (as mapped in MassGIS Data: Tidelands Jurisdiction (M.G.L. c.91) Datalayers) the 2021 MHW line was generally retained except in special cases (e.g., areas were outside of the project planning area). This approach was chosen to simplify the analysis as a careful field inspection and application of correct tidal datum values is required to determine the full extent of contemporary flowed tidelands and jurisdiction within a marsh area (see MassGIS Data: Tidelands Jurisdiction (M.G.L. c.91) Datalayers metadata for more information). Line features must be used together and are intended to assist with determinations of tidelands jurisdiction however, Chapter 91 jurisdiction cannot be precisely determined by using the dataset, and must be established by field inspection. Final jurisdictional approval issued by the Waterways Program of the Massachusetts Department of Environmental Protection. This dataset is intended for planning purposes only. MassGIS Data: Tidelands Jurisdiction (M.G.L. c.91) Datalayers were compiled and used as the base layers in this dataset (see supplemental information) The characteristics that make shorelines resilient and their ability to respond to natural hazards operate independently of municipal boundaries. To facilitate and promote consistent and synergistic management techniques shoreline characteristics of three adjacent communities were examined in the absence of municipal boundaries in order to develop a comprehensive shoreline management framework. The three adjacent communities, Brewster, Dennis and Orleans, partnered to develop a framework for an intermunicipal approach to shoreline management to promote short- and long-term science-based decisions that will maximize the effectiveness and efficiency of community responses to the increased threat of coastal hazards. GIS-based datasets comprising the Intermunicipal Shoreline Management Database were compiled from existing sources and supplemented by additional data where appropriate. Contemporary shoreline resilience conditions have been characterized throughout the study area to identify issues and challenges currently confronting each town’s management efforts. This assessment is based on existing data (available through CZM’s Shoreline Change database, MORIS and MassGIS), information from multiple MCZM Coastal Resiliency projects (Borrelli et al., 2016; Borrelli et al., 2017; Giese et al., 2013, Giese et al., 2018) and other resources including the U.S. Army Corps of Engineers, the U.S. Geological Survey, NOAA, the Barnstable County Dredge Program, and records from the individual towns.本数据集的要素为基于历史与现代数据源绘制的区域向陆侧最高潮位线。本数据集包含马萨诸塞州（Commonwealth of Massachusetts）依据第91章及《航道条例》（310 CMR 9.00）划定的潮间带管辖权推定界线的更新版本。《公共滨水区法案》（Public Waterfront Act）针对历史上及当前位于最高潮位线以下的潮间带制定了公共信托要求。本数据集将最新的现代平均高潮位线纳入现有马萨诸塞州第91章测绘项目的数据图层中。本次更新基于地理数据库（geodatabase）要素类（feature class）Tidal_Shorelines_2021中呈现的2021年平均高潮位（Mean High Water, MHW）线。请注意，在现代沼泽区域（详见马萨诸塞州地理信息系统（MassGIS）数据：《潮间带管辖权（M.G.L. c.91）数据图层》）中，除特殊情况（如位于项目规划区域外的区域）外，通常保留2021年平均高潮位线。选择该方法是为了简化分析流程，因为要确定沼泽区域内现代受潮汐影响的潮间带范围及管辖权，需进行细致的野外勘查并应用正确的潮汐基准面数值（详见马萨诸塞州地理信息系统数据：《潮间带管辖权（M.G.L. c.91）数据图层》元数据以获取更多信息）。线要素需结合使用，旨在辅助潮间带管辖权的判定，但仅依靠本数据集无法精准确定第91章管辖范围，需通过野外勘查予以认定。最终管辖权审批由马萨诸塞州环境保护部航道项目办公室出具。本数据集仅用于规划用途。本数据集以马萨诸塞州地理信息系统数据：《潮间带管辖权（M.G.L. c.91）数据图层》为基础图层进行编制（详见补充信息）。 使海岸线具备韧性的特征及其应对自然灾害的能力，不受行政辖区边界的限制。为推动形成统一协同的海岸线管理方法，本次研究突破行政辖区边界限制，对三个相邻社区的海岸线特征展开分析，以构建全面的海岸线管理框架。布鲁斯特（Brewster）、丹尼斯（Dennis）和奥尔良（Orleans）这三个相邻社区携手合作，制定了跨辖区海岸线管理框架，旨在推动基于科学的短期与长期决策，最大限度提升社区应对日益严峻的海岸灾害威胁的响应效率与效果。本跨辖区海岸线管理数据库（Intermunicipal Shoreline Management Database）所包含的基于地理信息系统（GIS）的数据集，均从现有数据源编制而成，并在适宜情况下补充了额外数据。本次研究对整个研究区域内的现代海岸线韧性状况进行了特征刻画，以识别各城镇当前管理工作面临的问题与挑战。本次评估基于现有数据（可通过海岸带管理（CZM）海岸线变化数据库、马萨诸塞州海洋与海岸资源信息系统（MORIS）及马萨诸塞州地理信息系统获取）、多项马萨诸塞州海岸带管理（MCZM）海岸韧性项目的相关资料（Borrelli等，2016；Borrelli等，2017；Giese等，2013；Giese等，2018），以及其他多类资源，包括美国陆军工程兵团（U.S. Army Corps of Engineers）、美国地质调查局（U.S. Geological Survey）、美国国家海洋和大气管理局（NOAA）、巴恩斯特布尔县疏浚项目及各城镇的相关记录。