NDLI: Influence of Agricultural Activity and Aquifer Intrinsic Vulnerability on Groundwater Quality in the Dagu River Watershed (Qingdao, China)

Content Provider	IEEE Xplore Digital Library
Author	Youyuan Chen Shiying Yang Shaojie Dong Yanmei Li Baoquan Sun Zuojiu Shao
Copyright Year	2010
Abstract	Contamination of the shallow aquifer by elevated nitrate concentrations is a common problem in many rural regions of the world. An aquifer that has both aquifer intrinsic vulnerability and irrigated land uses is especially susceptible to this type of contamination. A study was carried out to evaluate an aquifer's intrinsic vulnerability and agricultural activity's impact on groundwater quality in the Dagu River in Qingdao, which is located in the eastern part of China. The Dagu River aquifer supplies 50 % - 60 % of total water usage for Qingdao. Groundwater hydrochemistry was investigated. Regarding sampling, 436 samples in groundwater and river water were collected from April of 2000 to September of 2006. Results indicate the main forms of contamination are NO3--N, CaCO3, TDS, F-, and Cl- which exceed Chinese Groundwater Quality Standard Ⅲ (GB/T14848-93) by 82%, 57%, 23%, 20%, and 11% respectively. Nitrate concentration is calculated as nitrogen concentration, i.e. NO3--N. In particular, nitrate contamination in the shallow aquifer was evaluated by comparing NO3--N concentration versus parameters affecting aquifer intrinsic vulnerability (i.e., depth to water table, impact of the vadose zone, etc.). Also, the effect of land use and fertilizer usage on NO3--N concentration in groundwater was analyzed. The results suggest intensive agricultural activities, especially an overabundance of fertilizer used in vegetable planting, is an important key factor for nitrate contamination. When much of the fertilizer nitrogen is not converted into harvested crops, it leaves a significant fraction available for leaching into the thin sandy vadose zone which is called the "infiltration window".
Starting Page	1
Ending Page	6
File Size	390447
Page Count	6
File Format	PDF
ISBN	9781424447121
ISSN	21517622
DOI	10.1109/ICBBE.2010.5517811
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2010-06-18
Publisher Place	China
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Hydrology Oceans Water pollution Environmental factors Rivers Nitrogen Sun Water resources Contamination Fertilizers
Content Type	Text
Resource Type	Article

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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