Monitoring Soil and Underground Water EC in a Rice Field Affected by the Great East Japan Earthquake.
Monitoring Soil and Underground Water EC in a Rice Field Affected by the Great East Japan Earthquake.
复制标题
监测受东日本大地震影响的稻田的土壤和地下水 EC。
DOI：
10.11648/j.ijema.20160401.16
复制
发表时间：
2016
期刊：
影响因子：
--
通讯作者：
K.
中科院分区：
文献类型：
--
作者：
Muto;Y.;Kurashima;E.;Yamamoto;K.;Harashina;K.
2011年3月11日，东日本大地震后，岩手县陆前高田市的大友稻田地区因大规模的地面沉降和海啸而遭受了灾难性的破坏。地下水的电导率，土壤的体积电导率，和各种气象要素在一个固定的点，为期八个月。地下水的电导率在观测期开始时不规则地波动，在海平面上暂时达到5 Sm-1。一段时间后，总体下降趋势占主导地位，当观察结束时，水的电导率下降到0.55 Sm-1。土壤的体积电导率也逐渐下降，从0.4到0.3 Sm-1，在8个月内，这可能与降雨和海水入侵之间的相互作用。2004年12月26日苏门答腊岛附近印度洋地震后，这里的土壤电导率下降比海啸影响的地区更为缓慢，在我们的研究区域，土壤电导率尚未下降到允许恢复水稻种植的水平。据推测，这种差异是岩手县沉降的结果。
The Otomo rice field zone in Rikuzentakata City, Iwate Prefecture was catastrophically damaged by large-scale subsidence and the tsunami that followed the Great East Japan earthquake, which occurred on March 11th, 2011. Electrical conductivity of underground water, bulk electrical conductivity of the soil, and various meteorological elements were observed at a fixed point for eight months. The electrical conductivity of underground water fluctuated irregularly at the beginning of the observation period, temporarily reaching up to 5 Sm-1 at sea level. After some time, an overall decreasing trend prevailed, and when the observations ended the conductivity of the water had dropped to 0.55 Sm-1. The bulk electrical conductivity of the soil also decreased gradually, from 0.4 to 0.3 Sm-1, over the eight months, which is likely linked to the interactions between rainfall and seawater intrusions. The decrease in soil conductivity has been more gradual here than in the regions affected by the tsunami following the earthquake in the Indian Ocean off Sumatra on December 26th, 2004, and in our study area it has not yet decreased to a level that would allow the resumption of rice farming. It is proposed that this difference is a result of the subsidence in Iwate Prefecture.