A three-dimensional surface velocity field for the Mississippi Delta: Implications for coastal restoration and flood potential
A three-dimensional surface velocity field for the Mississippi Delta: Implications for coastal restoration and flood potential
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DOI：
10.1130/g36598.1
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发表时间：
2015-06-01
期刊：
影响因子：
5.8
通讯作者：
Malservisi, Rocco
中科院分区：
文献类型：
--
作者：
Karegar, Makan A.;Dixon, Timothy H.;Malservisi, Rocco
对密西西比三角洲（美国南部）目前沉降率的准确估计为湿地恢复规划和风暴潮洪水预测提供了依据。我们提出了一个全面的三维表面速度场的基础上，密西西比三角洲的36个高精度连续GPS站的网络。我们发现，虽然三角洲的大部分是相对稳定的，南部部分继续经历高沉降率（5-6毫米每年（-1））。我们的数据与路易斯安那州格兰德岛和佛罗里达几个站的长期验潮记录一致。目前沿部分沿海三角洲的相对海平面上升率（地面沉降和海平面上升的综合效应）沿着上升，约为8-9毫米/年。大多数验潮站都记录了公元1970年后海平面上升的加速。这些数据对该地区的土地复垦和湿地恢复有影响;三角洲的部分地区可能无法长期生存。
Accurate estimates of the current rate of subsidence in the Mississippi Delta (southern United States) provide a context for planning of wetland restoration and predictions of storm surge flooding. We present a comprehensive three-dimensional surface velocity field for the Mississippi Delta based on a network of 36 high-precision continuous GPS stations. We show that while the majority of the delta is relatively stable, the southern portion continues to experience high rates of subsidence (5-6 mm yr(-1)). Our data are consistent with long-term tide gauge records at Grand Isle, Louisiana, and several stations in Florida. The current rate of relative sea-level rise (combined effect of land subsidence and sea-level rise) along parts of the coastal delta is similar to 8-9 mm yr(-1). Most tide gauge stations have recorded sea-level-rise acceleration after A.D. 1970. These data have implications for land reclamation and wetland restoration in the region; parts of the delta may not be viable in the long term.