The shallow geothermal field in the south of Zhengzhou has been studied using integrated geophysical method of gravitative, magnetic and electrical survey.
利用重、磁、电综合物探勘测研究了郑州南浅层地热田。该地热田有明显的重磁电异常；
2
Such methods include that filling earth in the traffic bridge to change the position of gravitative centre of sluice chamber, and adding insertwalls to reduce the wall pressure of boxshaped wall.