Citation: | DOU Xuqiang, HAN Dongmei, CAO Tianzheng, SONG Xianfang, ZUO Wenzhe. ASSESSMENT OF SEAWATER INTRUSION IN THE COASTAL PLAIN AQUIFERS OF YANG-DAI RIVER USING DC-RESISTIVITY METHODS[J]. Marine Geology Frontiers, 2020, 36(8): 65-73. doi: 10.16028/j.1009-2722.2020.014 |
The distinct electrical difference between seawater and fresh water makes the Direct Current (DC) resistivity method useful for detecting and monitoring seawater intrusion (SWI). The aquifers invaded by seawater in different degrees exhibit significant resistivity difference, which could be classified into 3 groups: serious SWI (<5 Ω∙m), mild SWI (5~13 Ω∙m), and non-SWI (13~150 Ω∙m). Combined with the hydrogeological borehole data, the DC resistivity method can be used to identify the seawater intrusion affected areas after deleting the low resistance interference caused by clay layers. The results show that the seawater intrusion process in the Yang-Dai River plain has significant seasonal effects. It is relatively serious in June, the irrigation season and alleviated in March and November. The coastal shallow subsurface saltwater (brackish water) area in the study area is mainly distributed on the two sides of the river and gradually expanded into the surrounding irrigation area. Mixing of fresh and saline water from SWI and irrigation return flow is responsible for the saltwater sources. Near the coastline, sea farming could be the additive source for the saltwater input. The existing measures have played a certain role in slowing down the process of seawater intrusion, but it is still necessary to strengthen the measures to prevent and control seawater intrusion.
[1] | Werner A D,Bakker M,Post V E A,et al. Seawater intrusion processes,investigation and management:Recent advances and future challenges[J]. Advances in Water Resources,2013,51:3-26. doi: 10.1016/j.advwatres.2012.03.004 |
[2] | Santucci L,Carol E,Kruse E. Identification of palaeo-seawater intrusion in groundwater using minor ions in a semi-confined aquifer of the Río de la Plata littoral (Argentina)[J]. Science of The Total Environment,2016,566/567:1640-1648. doi: 10.1016/j.scitotenv.2016.06.066 |
[3] | Han D,Currell M J. Delineating multiple salinization processes in a coastal plain aquifer,northern China:hydrochemical and isotopic evidence[J]. Hydrol. Earth Syst. Sci.,2018,22(6):3473-3491. doi: 10.5194/hess-22-3473-2018 |
[4] | 黄 磊,郭占荣. 中国沿海地区海水入侵机理及防治措施研究[J]. 中国地质灾害与防治学报,2008,19(2):118-123. doi: 10.3969/j.issn.1003-8035.2008.02.025 |
[5] | Aslam R A,Shresth A S,Pandey V P. Groundwater vulnerability to climate change:A review of the assessment methodology[J]. Science of The Total Environment,2018,612:853-875. doi: 10.1016/j.scitotenv.2017.08.237 |
[6] | Swartz J H. Resistivity studies of some salt-water boundaries in the Hawaiian Islands[J]. Eos Transactions American Geophysical Union,1937,18(2):387-393. doi: 10.1029/TR018i002p00387 |
[7] | Dahlin T. The development of DC resistivity imaging techniques[J]. Computers and Geosciences,2001,27(9):1019-1029. |
[8] | Zarroca M,Bach J,Linares R,et al. Electrical methods (VES and ERT) for identifying,mapping and monitoring different saline domains in a coastal plain region (Alt Empordà,Northern Spain)[J]. Journal of Hydrology,2011,409(1):407-422. |
[9] | Alabjah B,Amraoui F,Chibout M,et al. Assessment of saltwater contamination extent in the coastal aquifers of Chaouia (Morocco) using the electric recognition[J]. Journal of Hydrology,2018,566:363-376. doi: 10.1016/j.jhydrol.2018.09.003 |
[10] | 何玉海. 高密度电法在莱州湾海水入侵调查中的研究与应用[J]. 海洋环境科学,2016,35(2):301-305. |
[11] | 刘宏伟,黄忠锋,郭 旭,等. 地球物理技术在识别海(咸)水入侵界线中的应用——以莱州湾冲洪积扇区为例[J]. 海洋地质前沿,2016,32(9):58-63. |
[12] | 韩再生,高恩厚. 洋河、戴河冲洪积平原水文地球化学特征及其成因分析[J]. 勘察科学技术,1988(4):16-20. |
[13] | 韩再生. 秦皇岛市洋河、戴河滨海平原海水入侵的控制与治理[J]. 现代地质,1990,4(2):105-115. |
[14] | 鲍 俊. 秦皇岛地区海水入侵的二维数值模拟[D]. 上海: 同济大学, 2005. |
[15] | 杨吉龙,韩冬梅,肖国强,等. 秦皇岛洋河-戴河冲洪积平原第四系含水层海水入侵机理分析[J]. 地质调查与研究,2009,32(2):144-149. doi: 10.3969/j.issn.1672-4135.2009.02.009 |
[16] | 左文喆,杨燕雄,董军义,等. 秦皇岛洋河-戴河沿海平原海水入侵数值模拟分析[J]. 自然资源学报,2009,24(12):2087-2095. doi: 10.3321/j.issn:1000-3037.2009.12.006 |
[17] | 章 斌,宋献方,郭占荣,等. 用氯和氢氧同位素揭示洋戴河平原地下水的形成演化规律[J]. 环境科学学报,2013,33(11):2965-2972. |
[18] | Sun Z,Song X,Bu H,et al. Origin of groundwater salinity and hydrochemical processes in an unconfined aquifer:case of Yang-Dai River basin in Qinhuangdao (China)[J]. Environmental Earth Sciences,2016,75(1):1-12. doi: 10.1007/s12665-015-4873-x |
[19] | 臧文学,刘文军,郭 巨,等. 河北省秦皇岛市海水入侵地质灾害及其防治措施[J]. 中国地质灾害与防治学报,2010,21(4):120-125. doi: 10.3969/j.issn.1003-8035.2010.04.023 |
[20] | 韩再生. 滨海孔隙含水层海水入侵的研究——以秦皇岛市洋河戴河冲洪积平原为例[D]. 北京: 中国地质大学, 1988. |
[21] | 左文喆. 秦皇岛洋戴河平原海水入侵调查与研究[D]. 北京: 中国地质大学, 2006. |
[22] | Archie G E. The Electrical Resistivity Log as an Aid in Determining Some Reservoir Characteristics[M].Transactions of American Institute of Mining Metallurgical Engineers, 1942. |
[23] | 张福振,刁世铭. 电测深方法在滨海平原区水文地质环境调查中的应用[J]. 低碳世界,2014(7):197-198. |
[24] | 罗文艺,靳孟贵,刘延锋,等. 深圳南山区海水入侵综合研究[J]. 海洋地质动态,2007,23(9):8-12,19. doi: 10.3969/j.issn.1009-2722.2007.09.002 |
[25] | 韩冬梅. 基于环境同位素及水化学的莱州湾海水入侵机理研究[R]. 北京: 中国科学院地理科学与资源研究所, 2009. |
[26] | De Franco R,Biella G,Tosi L,et al. Monitoring the saltwater intrusion by time lapse electrical resistivity tomography:The Chioggia test site (Venice Lagoon,Italy)[J]. Journal of Applied Geophysics,2009,69(3):117-130. |
[27] | Goebel M,Pidliseck Y A,Knight R. Resistivity imaging reveals complex pattern of saltwater intrusion along Monterey coast[J]. Journal of Hydrology,2017,551:746-755. doi: 10.1016/j.jhydrol.2017.02.037 |
Geological map
The relation of aquifer’s resistivity and TDS
Resistivity cross sections S1(2002.3),hydrogeological cross section 2 km away from the south of the line(Ⅰ-Ⅰ′)
Resistivity cross sections S2(2002.3),hydrogeological cross section 20° west of the line of survey(Ⅱ-Ⅱ′)
T1-T6 ERT profiles(2018.8)
Conceptual model of seawater intrusion in the Yang-Dai river plain