Hydrochemical implications of gravel mining on a coastal aquifer in a semi-arid environment of Northern Mexico
The La Mision coastal aquifer represents the outlet of the Guadalupe River Basin in Baja California, Mexico, to the Pacific Ocean. This aquifer has been a water supply for the state for over 40 years. Water overexploitation may cause an advance of salt-water intrusion, and the excessive mining of alluvial sands has exposed the aquifer to evaporation. The aquifer was monitored bimonthly from October 2003 to July 2004 and showed a general brackish quality with TDS ＞ 1000 mg/L, but lagoons nearest to the coast presented saline water compositions (TDS ＞ 10000mg/L). Wells farthest from the ocean showed potable water quality with TDS＜1000mg/L. Water sampled from private wells has a Cl/mixed-cation composition, whereas water from lagoons and government wells shows a Cl/Na composition. Anionic and cationic data from water samples imply a hydrogeochemical deterioration with time, caused by evaporation from exposed parts of the aquifer and seawater intrusion resulting from water pumping at nearby wells.
Thomas Kretzschmar Isaac Antuna-Ibarra
Departamento de Geologia, CICESE, Ensenada, Mexico
国际会议
第十二届水-岩相互作用国际研讨会(P0roceedings of the 12th International Symposium on Water-Rock Interaction)
昆明
英文
1059-1063
2007-07-31（万方平台首次上网日期，不代表论文的发表时间）