A GIS-based DRASTIC model for assessing aquifer vulnerability in Kakamigahara Heights, Gifu Prefecture, central Japan
A GIS-based DRASTIC model for assessing aquifer vulnerability in Kakamigahara Heights, Gifu Prefecture, central Japan
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DOI：
10.1016/j.scitotenv.2004.11.005
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发表时间：
2005-06-01
影响因子：
9.8
通讯作者：
Kato, K
中科院分区：
文献类型：
--
作者：
Babiker, IS;Mohamed, MAA;Kato, K
通过脆弱性评价来划定更容易受到人为污染的地区，已成为合理资源管理和土地利用规划的重要内容。本文旨在应用DRASTIC模型估算含水层脆弱性，并利用敏感性分析来评估模型参数对日本中部岐阜县Kakamigahara高地含水层脆弱性的相对重要性。另一个目标是证明综合使用DRASTIC方法和地理信息系统作为地下水污染风险评估的有效方法。DRASTIC模型使用7个环境参数（至水深度、净补给、含水层介质、土壤介质、地形、渗透带影响和水力导电性）来表征水文地质环境并评估含水层脆弱性。Kakamigahara含水层西部以“高”脆弱性等级为主，东部以“中等”脆弱性等级为主。研究区的东北部高架区域显示“低”含水层脆弱性。综合脆弱性图显示，由于集约化蔬菜种植的高污染潜力，Kakamigahara含水层东部面临高风险。然而，含水层较为脆弱的西部地区受到污染的风险较低。在卡卡米原高地，土地使用似乎是地下水硝酸盐污染的更好预测指标。净补给参数对含水层内在脆弱性的影响最大，其次是土壤介质、地形、渗透带介质和水力导电性。敏感性分析表明，净补给量、土壤介质和地形的变化导致脆弱性指数变化较大。此外，在评估含水层脆弱性方面，净补给和水力传导率比DRASTIC模型更有效。GIS技术提供了高效的分析环境和处理大型空间数据的能力。(c) 2004 Elsevier B.V.版权所有
Vulnerability assessment to delineate areas that are more susceptible to contamination from anthropogenic sources has become an important element for sensible resource management and land use planning. This contribution aims at estimating aquifer vulnerability by applying the DRASTIC model as well as utilizing sensitivity analyses to evaluate the relative importance of the model parameters for aquifer vulnerability in Kakamigahara Heights, Gifu Prefecture central Japan. An additional objective is to demonstrate the combined use of the DRASTIC and geographical information system (GIS) as an effective method for groundwater pollution risk assessment. The DRASTIC model uses seven environmental parameters (Depth to water, net Recharge, Aquifer media, Soil media, Topography, Impact of vadose zone, and hydraulic Conductivity) to characterize the hydrogeological setting and evaluate aquifer vulnerability. The western part of the Kakamigahara aquifer was dominated by "High" vulnerability classes while the eastern part was characterized by "Moderate" vulnerability classes. The elevated north-eastern part of the study area displayed "Low" aquifier vulnerability. The integrated vulnerability map shows the high risk imposed on the eastern part of the Kakamigahara aquifer due to the high pollution potential of intensive vegetable cultivation. The more vulnerable western part of the aquifer is, however, under a lower contamination risk. In Kakamigahara Heights, land use seems to be a better predictor of groundwater contamination by nitrate. Net recharge parameter inflicted the largest impact on the intrinsic vulnerability of the aquifer followed by soil media, topography, vadose zone media, and hydraulic conductivity. Sensitivity analyses indicated that the removal of net recharge, soil media and topography causes large variation in vulnerability index. Moreover, net recharge and hydraulic conductivity were found to be more effective in assessing aquifer vulnerability than assumed by the DRASTIC model. The GIS technique has provided efficient environment for analyses and high capabilities of handling large spatial data. (c) 2004 Elsevier B.V. All rights reserved.