2021_4_06_field_trial

The experimental data is the field detection data of a heavy metal contaminated site in the field by using the spectrum induced polarization method. (1) The experimental site is located in a village in Zhenjiang City, Jiangsu Province. The survey area is about 30 m above sea level, and the terrain is relatively flat. It belongs to a low mountain and hilly area with complex terrain. It is close to the mountain in the South and the Jiajiang River, a tributary of the Yangtze River, in the northeast. It is located in the north subtropical zone at mid latitude, and belongs to a marine climate. (2) There are many high-pressure towers at the experimental site, which have serious electromagnetic coupling interference. Some areas have heavy metal pollution sources in the deep part as shown in Figure 8, and some polluted soils are strongly acidic, which has a great impact on the lives of nearby residents. Through physical property analysis, it is found that most areas in this area have the highest chromium content, which is a typical heavy metal pollution site. (3) Gradient device is used for on-site spectrum IP detection. The receiving electrode m0~m8 uses low-frequency electric field sensor group to form 8-channel sampling. The position is fixed at a distance of 5m, and the transmitting electrode AB is 30m, moving 5m to the center each time. (4) During each measurement, 27 pseudo-random sequences with a fundamental frequency of 0.015625 Hz are transmitted, the sampling rate is 2 ksps, and the transmitter transmission voltage is 300 v. 

实验数据为采用谱诱导极化法在现场检测的重金属污染场地场态数据。（1）实验场地位于江苏省镇江市的一个村庄，海拔约30米，地形相对平坦，属于低山丘陵地带，地形复杂。该场地南部靠近山脉，东北部毗邻长江的支流嘉江河。它位于中纬度的北亚热带地区，属于海洋性气候。（2）实验场地内高压塔众多，存在严重的电磁耦合干扰。如图8所示，某些区域深层存在重金属污染源，部分受污染土壤呈强酸性，对附近居民的生活产生了重大影响。通过物理性质分析，发现该区域大部分地区铬含量最高，是一个典型的重金属污染场地。（3）使用梯度设备进行现场光谱IP检测。接收电极m0~m8采用低频电场传感器组形成8通道采样，位置固定在距离5米处，发射电极AB距离30米，每次移动5米至中心位置。（4）每次测量时，传输频率为0.015625 Hz的27个伪随机序列，采样率为2 ksps，发射器传输电压为300 v。