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对苏丹中部的北杰济拉(Gezira)省地下水的水化学特征进行了评价，评价方法包括地下水主要离子浓度的监测分析及矿化度、钠离子、重碳酸根离子和氯离子浓度等值线图的绘制．对每个含水层的的水化学特征及其地下水的管理问题进行了深入讨论，并对地下水的适用性进行了详细分析．在含水层上部存在的化学成分含量较高及碳酸钙的存在，是蒸发作用和渗入量增加的结果． 相似文献
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This paper describes an interactive Web-based survey tool that was developed by researchers at the University of Illinois at Chicago to advance a community planning process. The team used a process taken from the work of Jack Nasar (1998) that involves surveying residents to create an “evaluative image” of the community that could guide future design and development. While Nasar’s original method used a phone survey, UIC researchers developed a Web site through which participants interacted with a map that was linked through a server to a GIS program. This project builds upon an earlier version of the survey by increasing the complexity and the coverage area of the interactive map (Al-Kodmany, 2000). 相似文献
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