摘要
关中盆地浅层地下水面状硝酸盐污染严重,以'三氮'为主要污染物。分析了地下水特殊脆弱性内涵,以及地下水本质因素、人为因素及污染物特殊因素等对脆弱性的影响,并从中选取13个评价因子。将包气带'三氮'迁移转化过程数值模拟结果耦合到脆弱性评价模型中,使过程模型与评价模型结合起来,再结合GIS技术,对地下水特殊脆弱性进行了评价。结果表明,易引起地下水'三氮'的地区主要分布在渭河中下游冲积平原、黄土台塬洼地、以及渭河南岸西安一带小于20 m厚的黄土台塬等地区。从2001年关中盆地地下水'三氮'污染分布来看,这些地区地下水硝酸盐已出现大面积超标,评价结果与地下水实际'三氮'污染情况基本吻合。
The large area nitrate pollution in unconfined water is very serious in Guanzhong basin, and ＂three nitrogen＂ is main contaminant, the concept of groundwater special vulnerability and its influence factors such as groundwater intrinsic factor, artificial factor, and specific factor about contaminant were analyzed. From these factors, 13 parameters were chosen to assess groundwater special vulnerability. The simulating results of ＂three nitrogen＂ transport and transformation were coupled to the special vulnerability evaluation model so that the process models were cupled with evaluation model, together with GIS technology, the special vulnerability of groundwater was evaluated. It is shown that the areas in which groundwater is polluted by ＂three nitrogen＂ easily are the alluvial plain which located at middle and lower Weihe River, low loess tableland, and the loess tableland that the thickness is less than 20 m near Xi＇an at the south bank of Weihe River. The assessment results are accorded with the actual groundwater nitrogen pollution distribution in the year 2001, the concentration of nitrate in groundwater in these areas have exceed criterion in a large region.
出处
《吉林大学学报（地球科学版）》
EI
CAS
CSCD
北大核心
2009年第6期1106-1110,1116,共6页
Journal of Jilin University：Earth Science Edition
基金
国家自然科学基金项目(40872163)
关键词
地下水特殊脆弱性
过程模型与评价模型耦合
三氮污染
关中盆地
地下水
groundwater special vulnerability
process model coupled with evaluating model
＂three nitrogen＂pollution
Guanzhong basin
groundwater
