三亚红塘湾应急地下水源地研究

Demonstration on Emergency Groundwater Field in Hongtang Bay,Sanya City of Hainan Province

为解决季节性干旱和突发事件引起的供水紧张与保障重大工程红塘湾海上机场建设的应急供水安全,在三亚地区环境地质综合调查的基础上,从水质评价、地下水资源量和应急水源地保障程度等方面开展红塘湾地区应急地下水源地论证评价工作。论证结果表明,本区水源地内松散-半固结岩类孔隙承压水水质质量等级为Ⅴ级,超标组分为铁、锰及微生物。在考虑越流补给的条件下,红塘湾应急地下水源地按可采控制降深10 m可得应急供水量为3900 m^(3)/d;3个月的应急期内可提供的总地下水资源开采量为3.51×10^(5)m^(3),在海岸线一带引起的水位降深小于0.039 m,不会引起地下水降落漏斗和海水入侵等环境地质问题。三亚红塘湾地下水源地能保证海上新建机场及周边近5.2万人3个月的应急供水需要,对于保障和服务红塘湾新建机场的正常运转意义重大。

It is key problem to solve the shortage of water supply due to seasonal droughts and emergencies,and to ensure the safety of emergency water supply for the major construction of Hongtang Bay Maritime Air-port in Sanya City of Hainan Province.Based on the comprehensive survey of regional environmental geology in the Sanya area,the authors carried out the demonstration and evaluation of emergency groundwater sourc-es,including water quality evaluation,groundwater resources and the degree of guarantee of emergency water sources.Our studies show that the water quality grade of the loose to semi-consolidated rock pore confined water in the water source is Grade V,with the excessive components of iron,manganese and microorganisms.Under the condition of overflowing recharge,the Hongtang Bay emergency groundwater field can provide/d according to the controlled drawdown depth of 10 m,and the total amount of groundwater resources of 3.51×10^(5)m^(3)within 3 months emergency period,but lead to water level drop to be only less than 0.039 m deep along the coastline which will not cause environmental geological problems such as groundwater drop funnel and salt water intrusion.The groundwater field can guarantee emergency water supply needs of nearly 52000 people in the new airport and the surrounding areas for three months,and have great significance for ensuring the normal operation of the newly built Hongtang Bay airport.