使用DRASTIC-LU/LC模型评估坦桑尼亚莫罗戈罗市地下水对硝酸盐污染的脆弱性

IF 1.6 4区 地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY Earth Interactions Pub Date : 2022-11-07 DOI:10.3390/earth3040067
Neema J. Mkumbo, K. Mussa, E. E. Mariki, I. C. Mjemah
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引用次数: 7

摘要

地下水是一种有用的水源,在不同的地方有不同的用途。使用这种资源的主要挑战是如何管理和保护它免受污染。目前的研究是在莫罗戈罗市进行的,利用DRASTIC-LU/LC模型来确定脆弱的地下水区域。该研究采用地下水位深度、净补给、含水层介质、土壤介质、地形、渗透带影响、水力导率和土地利用/土地覆盖模式等8个输入参数,在GIS中叠加生成地下水脆弱性图。该模型采用评级(R = 1-10)和加权(W = 1-5)技术来评价各参数对地下水污染的影响。DRASTIC-LU/LC脆弱性指数图分为低脆弱性区(面积为29.2 km2)、中脆弱性区(面积为120.4 km2)和高脆弱性区(面积为124.4 km2)。采用镉还原法(DR 890)进行硝酸盐分析,评估模型的有效性,发现硝酸盐浓度不合格(>50 mg/L)、高(29-50 mg/L)和中等(14-28 mg/L)的样品中,分别有55%、15%和50%属于高易损区。其中,不可接受、高、中硝酸盐浓度分别占45%、70%和50%的样品处于中等脆弱区。在低易损性区,只有15%的样品硝酸盐浓度较高。
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The Use of the DRASTIC-LU/LC Model for Assessing Groundwater Vulnerability to Nitrate Contamination in Morogoro Municipality, Tanzania
Groundwater is a useful source of water for various uses in different places. The major challenge in the use of this resource is how to manage and protect it from contamination. The current study was conducted in Morogoro Municipality to identify vulnerable groundwater areas by using DRASTIC-LU/LC model. The study applied eight input parameters, i.e., depth to water table, net recharge, aquifer media, soil media, topography, impact of vadose zone, hydraulic conductivity and land use/land cover patterns, which were overlaid in GIS to generate groundwater vulnerable map. The model used rating (R = 1–10) and weighting (W = 1–5) techniques to assess the effect of each parameter on groundwater contamination. The DRASTIC-LU/LC Vulnerability Index map was classified into low- (area = 29.2 km2), moderate- (area = 120.4 km2) and high-vulnerability zones (area = 124.4 km2). Nitrate analysis was conducted using the cadmium reduction method (DR 890) to assess the validity of the model and it was observed that 55%, 15% and 50% of the samples with unacceptable (>50 mg/L), high (29–50 mg/L) and moderate (14–28 mg/L) nitrate concentrations, respectively, fall into the high-vulnerability zone. Furthermore, 45%, 70% and 50% of the samples with unacceptable, high and moderate nitrate concentrations, respectively, fall into the moderate-vulnerability zone. In the low-vulnerability zone, only 15% of samples were found with a high nitrate concentration.
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来源期刊
Earth Interactions
Earth Interactions 地学-地球科学综合
CiteScore
2.70
自引率
5.00%
发文量
16
审稿时长
>12 weeks
期刊介绍: Publishes research on the interactions among the atmosphere, hydrosphere, biosphere, cryosphere, and lithosphere, including, but not limited to, research on human impacts, such as land cover change, irrigation, dams/reservoirs, urbanization, pollution, and landslides. Earth Interactions is a joint publication of the American Meteorological Society, American Geophysical Union, and American Association of Geographers.
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