Piezocone penetrometer measurements in coastal Louisiana wetlands
Piezocone penetrometer measurements in coastal Louisiana wetlands
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DOI：
10.1016/j.ecoleng.2018.12.012
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发表时间：
2019-02-01
影响因子：
3.8
通讯作者：
Chen, Qin
中科院分区：
文献类型：
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作者：
Jafari, Navid H.;Harris, Brian D.;Chen, Qin
许多关于湿地丧失的研究强调了湿地土壤的岩土特性和行为的重要性，例如沼泽边缘侵蚀、浅沉降、湿地塌陷和连根拔起。本研究概述了如何使用改进的压电锥入度计快速评估各种生态、地质和水文湿地条件下的沼泽剪切强度、孔隙度和电导率。在路易斯安那州科科德里附近的特雷博恩湾进行了实地考察，以评估锥体在表征盐沼剪切强度和地层学方面的功效。根据现场测量，该测试方法具有可重复性，并且符合 ASTM D5778 标准指南。压电锥测深用于评估植被根垫、有机粘土和无机粘土层的剪切强度和地层学。这些发现被综合成一个理想化的湿地岩土工程框架，用于开发湿地损失的机制模型。
The importance of geotechnical properties and behavior of wetland soils is underscored by the many studies on wetland loss, e.g., marsh edge erosion, shallow subsidence, wetland collapse, and uprooting. This study provides an overview of using a modified piezocone penetrometer to rapidly evaluate marsh shear strength, porosity, and electrical conductivity over a range of ecological, geological, and hydrologic wetland conditions. Field campaigns were conducted in Terrebonne Bay near Cocodrie, Louisiana to evaluate the efficacy of the cone to characterize the shear strength and stratigraphy of salt marshes. Based on the field measurements, the test method was found to be repeatable and consistent with the ASTM D5778 standard guideline. The piezocone soundings were used to evaluate the shear strength and stratigraphy of the vegetation root mat, organic clay, and inorganic clay layers. These findings were synthesized into an idealized wetland geotechnical framework for developing mechanistic models of wetland loss.