A new soil mechanics approach to quantify and predict land subsidence by peat compression
A new soil mechanics approach to quantify and predict land subsidence by peat compression
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DOI：
10.1002/2016gl071116
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发表时间：
2016-10-28
影响因子：
5.2
通讯作者：
Zwanenburg, Cor
中科院分区：
文献类型：
--
作者：
Koster, Kay;Erkens, Gilles;Zwanenburg, Cor
地面沉降威胁着许多沿海地区。量化当前的沉降和预测未来的沉降对于维持这些地区在海平面上升的情况下的生存能力至关重要。尽管其规模和严重程度，量化沉降的方法很少。在富含泥炭的沉陷热点地区，往往是泥炭压缩引起的沉陷。我们介绍了标准的锥突试验（CPT）作为一种量化泥炭压缩引起的沉降的技术。在荷兰沿海平原的一项测试中，我们发现泥炭的厚度减少与锥体阻力之间存在很强的关系，因为泥炭在压缩后刚度增加。我们利用这些结果量化了萨克拉门托-圣华金三角洲和加里曼丹沉降区的泥炭沉降，并发现了与先前观测相对应的值。这些结果为CPT作为一种记录过去和预测未来大面积泥炭压缩引起的沉降的新方法打开了大门。
Land subsidence threatens many coastal areas. Quantifying current and predicting future subsidence are essential to sustain the viability of these areas with respect to rising sea levels. Despite its scale and severity, methods to quantify subsidence are scarce. In peat-rich subsidence hot spots, subsidence is often caused by peat compression. We introduce the standard Cone Penetration Test (CPT) as a technique to quantify subsidence due to compression of peat. In a test in the Holland coastal plain, the Netherlands, we found a strong relationship between thickness reduction of peat and cone resistance, due to an increase in peat stiffness after compression. We use these results to quantify subsidence of peat in subsiding areas of Sacramento-San Joaquin delta and Kalimantan, and found values corresponding with previously made observations. These results open the door for CPT as a new method to document past and predict future subsidence due to peat compression over large areas.