• 主题
高级搜索  >
历史搜索 清空历史
首页> 美国政府科技报告 >Land And Forest Area Changes In The Vicinity Of The Mississippi River Gulf Outlet, Central Wetlands Region, 1935-2010.
【24h】

Land And Forest Area Changes In The Vicinity Of The Mississippi River Gulf Outlet, Central Wetlands Region, 1935-2010.

机译：1935年至2010年，中部湿地地区密西西比河湾出口附近的土地和森林面积变化。

获取原文
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

As part of the overall Mississippi River Gulf Outlet (MRGO) Ecosystem Restoration Study, the Central Wetlands Unit (CWU) is a critical coastal restoration project proposed to mitigate the effects of the MRGO dredging and dredged material placement in southeastern coastal Louisiana. An in-depth knowledge of recent and historical coastal landscape history is a key knowledge element required by project managers to make informed decisions for implementing the overall CWU restoration strategy. The goal of this study was to provide a refined landscape history for the CWU that both exceeds and supplements information provided by existing coastal habitat and land loss data sets. The research identified and quantified recent and historical land change trends and general forested wetland habitat changes within the CWU from 1935 to 2010. The CWU land area changes were analyzed using a series of land-water data sets obtained from classified Landsat Thematic Mapper (TM) satellite imagery, historic aerial photography and topographic quadrangles. Wetland forested habitat changes were evaluated using two pre-construction (1935 and 1956) and two post-construction (1965 and 1974) data sets bracketing the construction of the MRGO (1965). The study revealed that the CWU net land loss from 1935 to 2010 was 6,688 acres with a land area change rate of -87.6 + or - 11.1 acres/yr (r sq = 0.68). Rapid loss of forested habitat also occurred within the CWU throughout the 1935 to 1974 analysis period. In 1935, the CWU consisted of 13, 924 acres of forested habitat and by 1974 virtually all were lost. The primary events affecting historical landscape change within the CWU over the past 75 years are linked to (1) cumulative hurricane impacts causing physical removal of marsh, (2) partial flooding of impounded areas after Hurricane Betsy, (3) construction of the MRGO, and (4) salinity increases causing habitat conversion.

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号