摘要
在全面收集前人调研资料的基础上,在研究区系统采集了236件潜水样品,对测试数据进行了统计处理和指标法评价,分析了大荔县潜水水质现状及主要影响因素,并初步探讨了潜水水质的变化趋势。结果表明,大荔县潜水水质普遍较差,影响水质的主要因素是TDS偏高,硝酸盐污染,硫酸盐、氯化物、氟离子严重超标等。全县约1230.24km2(占总面积的4/5)的潜水不能直接饮用和灌溉。适宜饮用的潜水主要分布在洛河沿岸及洛河以南的风积沙地区,面积约110.06km2,仅占总面积的1/15。洛河以北的潜水均达不到生活饮用水的水质质标准。洛河南部风积沙地水质尚好,适于灌溉,但长期不合理的施肥等造成NO3-大量富集,又影响了潜水水质。通过水质对比分析发现,近30多年前后大荔县潜水水质总体呈好转趋势,但因水文地质条件的控制,其转变趋势非常缓慢。
A total of 236 samples of phreatic water were collected from Dali County and analyzed, and on the basis of previous data, the authors used the statistical processing and single index evaluation methods to analyze the present situation of phreatic water quality in the study area and its main influence factors and preliminarily discussed the change trend of the phreatic water quality. The results show that： the phreatic water quality in Daft County is generally poor, and the main factors that affect water quality are as follows： the TDS content is too high, there occurs nitrate pollution and sulfate, chloride and fluorine ions exceed the standard limits greatly. Phreatic water covering an area of about 1230.24 km^2 （which accounts for 4/5 of the total area） cannot be directly drunk and used for irrigation. The drinkable phreatic water is mainly distributed along both banks of the Luohe River and in the wind-borne sandy area south of the river, it covers an area of 110.06 km^2, taking up only 1/15 of the total area. The phreatic water quality south of the Luo RiVer nearly all cannot meet the standards of potable water. Although the phreatic water in the wind-borne sandy area is of good quality and suitable for irrigation, because of the long-term irrational fertilization, large amount of NO3^- is concentrated affecting the phreatic water quality. Comparative analysis of water quality has revealed that in the last thirty-odd years the phreatic water quality in Daft County has showed a trend of turning better; however, because of the hydrogeological conditions, the transformation has been very slow.
出处
《地质通报》
CAS
CSCD
北大核心
2008年第8期1196-1204,共9页
Geological Bulletin of China
基金
中国地质调查局项目《陕西省大荔县高氟水调查评价》(编号:12120100634713)资助。
关键词
潜水
水质现状
变化趋势
陕西大荔
phreatic water
present state of water quality
change tendency
Daft County, Shaanxi
