Airborne electromagnetic and magnetic survey of Delaware Bay and surrounding regions of New Jersey and Delaware, 2022

Airborne electromagnetic (AEM) and magnetic survey data were collected during July and August 2022 over a distance of 3,588.5 line kilometers covering Delaware Bay and surrounding regipons in New Jersey and Delaware. Data were collected as part of the USGS Delaware River Basin Next Generation Water Observing Systems (NGWOS) project to improve understanding of groundwater salinity distributions near Delaware Bay. The survey was primarily funded by the USGS, with partial support through collaboration with the University of Delaware to extend data collection to parts of Rehoboth Bay and Indian River Bay. Data were acquired by SkyTEM Canada Inc. with the SkyTEM 304M time-domain helicopter-borne electromagnetic system together with a Geometrics G822A cesium vapor magnetometer. The survey was acquired at a nominal flight height of 30 - 40 m above terrain along parallel flight lines primarily oriented southwest-northeast and with nominal line spacing of 500 m over land and nearshore, and 3000 m over open-water parts of Delaware Bay. Several irregular flightlines were acquired along, and perpendicular to, nearby rivers to capture salinity patterns along these hydrologic flowpaths.2022年7月至8月期间，研究团队采集了航空电磁（Airborne Electromagnetic，AEM）与磁法测量数据，测线总长3588.5线千米，覆盖特拉华湾（Delaware Bay）及新泽西州、特拉华州周边区域。本次数据采集作为美国地质调查局（United States Geological Survey，USGS）特拉华河流域下一代水观测系统（Next Generation Water Observing Systems，NGWOS）项目的组成部分，旨在加深对特拉华湾周边地下水盐度分布的认知。本次测量主要由美国地质调查局资助，并通过与特拉华大学（University of Delaware）合作获得部分支持，以将数据采集范围拓展至雷霍博特湾（Rehoboth Bay）与印第安河湾（Indian River Bay）的部分区域。数据由加拿大SkyTEM公司（SkyTEM Canada Inc.）搭载SkyTEM 304M时域直升机载电磁系统，搭配Geometrics G822A型铯蒸气磁强计完成采集。本次测量的标称飞行高度为地形上方30至40米，飞行测线以西南-东北走向为主且呈平行排布；陆地及近岸区域的标称线间距为500米，特拉华湾开阔水域的标称线间距则为3000米。此外，研究团队沿邻近河道及其垂直方向布设了多条不规则测线，以获取这些水文径流路径上的盐度分布特征。