Boomer shotpoint navigation from USGS cruise 1999-045-FA along the inner continental shelf of northern North Carolina (isb1999045_shots.shp)

The northeastern North Carolina coastal system, from False Cape, Virginia, to Cape Lookout, North Carolina, has been studied by a cooperative research program that mapped the Quaternary geologic framework of the estuaries, barrier islands, and inner continental shelf. This information provides a basis to understand the linkage between geologic framework, physical processes, and coastal evolution at time scales from storm events to millennia. The study area attracts significant tourism to its parks and beaches, contains a number of coastal communities, and supports a local fishing industry, all of which are impacted by coastal change. Knowledge derived from this research program can be used to mitigate hazards and facilitate effective management of this dynamic coastal system.
This regional mapping project produced spatial datasets of high-resolution geophysical (bathymetry, backscatter intensity, and seismic reflection) and sedimentary (core and grab-sample) data. The high-resolution geophysical data were collected during numerous surveys within the back-barrier estuarine system, along the barrier island complex, in the nearshore, and along the inner continental shelf. Sediment cores were taken on the mainland and along the barrier islands, and both cores and grab samples were taken on the inner shelf. Data collection was a collaborative effort between the U.S. Geological Survey (USGS) and several other institutions including East Carolina University (ECU), the North Carolina Geological Survey, and the Virginia Institute of Marine Science (VIMS).
The high-resolution geophysical data of the inner continental shelf were collected during six separate surveys conducted between 1999 and 2004 (four USGS surveys north of Cape Hatteras: 1999-045-FA, 2001-005-FA, 2002-012-FA, 2002-013-FA, and two USGS surveys south of Cape Hatteras: 2003-003-FA and 2004-003-FA) and cover more than 2600 square kilometers of the inner shelf. Single-beam bathymetry data were collected north of Cape Hatteras in 1999 using a Furuno fathometer. Swath bathymetry data were collected on all other inner shelf surveys using a SEA, Ltd. SwathPLUS 234-kHz bathymetric sonar. Chirp seismic data as well as sidescan-sonar data were collected with a Teledyne Benthos (Datasonics) SIS-1000 north of Cape Hatteras along with boomer seismic reflection data (cruises 1999-045-FA, 2001-005-FA, 2002-012-FA and 2002-013-FA). An Edgetech 512i was used to collect chirp seismic data south of Cape Hatteras (cruises 2003-003-FA and 2004-003-FA) along with a Klein 3000 sidescan-sonar system. Sediment samples were collected with a Van Veen grab sampler during four of the USGS surveys (1999-045-FA, 2001-005-FA, 2002-013-FA, and 2004-003-FA). Additional sediment core data along the inner shelf are provided from previously published studies.
A cooperative study, between the North Carolina Geological Survey and the Minerals Management Service (MMS cores), collected vibracores along the inner continental shelf offshore of Nags Head, Kill Devils Hills and Kitty Hawk, North Carolina in 1996. The U.S. Army Corps of Engineers collected vibracores along the inner shelf offshore of Dare County in August 1995 (NDC cores) and July-August 1995 (SNL cores). These cores are curated by the North Carolina Geological Survey and were used as part of the ground validation process in this study.
Nearshore geophysical and core data were collected by the Virginia Institute of Marine Science. The nearshore is defined here as the region between the 10-m isobath and the shoreline. High-resolution bathymetry, backscatter intensity, and chirp seismic data were collected between June 2002 and May 2004. Vibracore samples were collected in May and July 2005.
Shallow subsurface geophysical data were acquired along the Outer Banks barrier islands using a ground-penetrating radar (GPR) system. Data were collected by East Carolina University from 2002 to 2005. Rotasonic cores (OBX cores) from five drilling operations were collected from 2002 to 2006 by the North Carolina Geological Survey as part of the cooperative study with the USGS. These cores are distributed throughout the Outer Banks as well as the mainland.
The USGS collected seismic data for the Quaternary section within the Albemarle-Pamlico estuarine system between 2001 and 2004 during six surveys (2001-013-FA, 2002-015-FA, 2003-005-FA, 2003-042-FA, 2004-005-FA, and 2004-006-FA). These surveys used Geopulse Boomer and Knudsen Engineering Limited (KEL) 320BR Chirp systems, except cruise 2003-042-FA, which used an Edgetech 424 Chirp and a boomer system. The study area includes Albemarle Sound and selected tributary estuaries such as the South, Pungo, Alligator, and Pasquotank Rivers; Pamlico Sound and trunk estuaries including the Neuse and Pamlico Rivers; and back-barrier sounds including Currituck, Croatan, Roanoke, Core, and Bogue.

美国北卡罗来纳州东北部海岸系统，范围涵盖弗吉尼亚州假角（False Cape）至北卡罗来纳州卢考特角（Cape Lookout），已由一项合作研究计划完成系统研究，该计划对河口、障壁岛以及内陆陆架的第四纪地质框架开展了填绘工作。本研究成果为理解地质框架、物理过程与海岸演化之间的联系提供了基础，研究覆盖的时间跨度从风暴事件尺度直至千年尺度。该研究区域的公园与海滩吸引了大量游客，区域内分布有多个沿海社区，同时支撑着当地渔业，上述所有活动均受海岸变化的影响。本研究计划产出的相关知识可用于减缓灾害风险，并助力该动态海岸系统的高效管理。
本区域填绘项目生成了高分辨率地球物理（水深测量（bathymetry）、背散射强度（backscatter intensity）与地震反射（seismic reflection））与沉积（岩心与抓斗采样（core and grab-sample））数据的空间数据集。高分辨率地球物理数据采集于障壁后河口系统、障壁岛群、近岸区域以及内陆陆架的多次勘测作业中。岩心采样在大陆地区及障壁岛沿线开展，岩心与抓斗采样则均在内陆陆架实施。数据采集工作由美国地质调查局（U.S. Geological Survey, USGS）与东卡罗来纳大学（East Carolina University, ECU）、北卡罗来纳地质调查局、弗吉尼亚海洋科学研究所（Virginia Institute of Marine Science, VIMS）等多家机构协作完成。
内陆陆架的高分辨率地球物理数据采集于1999年至2004年间开展的六次独立勘测中：哈特拉斯角（Cape Hatteras）以北的四次USGS航次（1999-045-FA、2001-005-FA、2002-012-FA、2002-013-FA），以及哈特拉斯角以南的两次USGS航次（2003-003-FA与2004-003-FA），勘测范围覆盖超过2600平方公里的内陆陆架。1999年，研究人员使用古野测深仪（Furuno fathometer）在哈特拉斯角以北采集了单波束水深测量数据；其余内陆陆架勘测均使用SEA有限公司SwathPLUS 234千赫测深声呐采集多波束水深测量数据。哈特拉斯角以北区域的Chirp地震数据与侧扫声呐数据由Teledyne Benthos（Datasonics）SIS-1000采集，同时配套电火花地震反射数据（对应航次1999-045-FA、2001-005-FA、2002-012-FA及2002-013-FA）。哈特拉斯角以南的航次（2003-003-FA与2004-003-FA）则使用Edgetech 512i采集Chirp地震数据，并搭配Klein 3000侧扫声呐系统。研究人员在四次USGS航次（1999-045-FA、2001-005-FA、2002-013-FA及2004-003-FA）中使用Van Veen抓斗采样器采集了沉积物样本。内陆陆架的额外岩心数据来自已发表的相关研究。
北卡罗来纳地质调查局与矿产管理服务局（Minerals Management Service, MMS）开展合作研究，于1996年在北卡罗来纳州纳格斯黑德（Nags Head）、魔鬼山（Kill Devils Hills）与基蒂霍克（Kitty Hawk）近海的内陆陆架采集了振动岩心。美国陆军工程兵团分别于1995年8月（NDC岩心）与1995年7-8月（SNL岩心）在戴尔县（Dare County）近海的内陆陆架采集了振动岩心，这批岩心由北卡罗来纳地质调查局保存，作为本研究地面验证工作的一部分。
近岸地球物理与岩心数据由弗吉尼亚海洋科学研究所采集，本研究中近岸区域定义为10米等深线与海岸线之间的范围。研究团队于2002年6月至2004年5月间采集了高分辨率水深、背散射强度与Chirp地震数据，并于2005年5月与7月采集了振动岩心样本。
东卡罗来纳大学于2002年至2005年间，使用探地雷达（ground-penetrating radar, GPR）系统在外滩群岛（Outer Banks）沿线采集了浅地表地球物理数据。北卡罗来纳地质调查局于2002年至2006年间，通过五次钻探作业采集了旋转声波岩心（OBX岩心），作为与USGS合作研究的一部分，这批岩心分布于外滩群岛及大陆地区。
USGS于2001年至2004年间，通过六次航次（2001-013-FA、2002-015-FA、2003-005-FA、2003-042-FA、2004-005-FA及2004-006-FA）在阿尔伯马尔-帕姆利科河口系统（Albemarle-Pamlico estuarine system）内采集了第四纪剖面的地震数据。除2003-042-FA航次使用Edgetech 424声呐扫描系统与电火花系统外，其余航次均采用Geopulse电火花系统与Knudsen工程有限公司（Knudsen Engineering Limited, KEL）320BR声呐扫描系统。本研究区域包括阿尔伯马尔湾（Albemarle Sound）及南河、庞戈河、阿尔及哥河与帕斯科坦克河等选定支流河口；帕姆利科湾（Pamlico Sound）及纽斯河、帕姆利科河等主干河口；以及柯里塔克湾（Currituck Sound）、克罗阿坦湾（Croatan Sound）、罗阿诺克湾（Roanoke Sound）、科尔湾（Core Sound）与博格湾（Bogue Sound）等障壁后湾。