Abstract
Increasing pressure on water resources worldwide has resulted in groundwater contamination, and thus the deterioration of the groundwater resources and a threat to the public health. Risk mapping of groundwater contamination is an important tool for groundwater protection, land use management, and public health. This study presents a new approach for groundwater contamination risk mapping, based on hydrogeological setting, land use, contamination load, and groundwater modelling. The risk map is a product of probability of contamination and impact. This approach was applied on the Gaza Strip area in Palestine as a case study. A spatial analyst tool within Geographical Information System (GIS) was used to interpolate and manipulate data to develop GIS maps of vulnerability, land use, and contamination impact. A groundwater flow model for the area of study was also used to track the flow and to delineate the capture zones of public wells. The results show that areas of highest contamination risk occur in the southern cities of Khan Yunis and Rafah. The majority of public wells are located in an intermediate risk zone and four wells are in a high risk zone.
ملخص
إن زيادة الضغط على مصادر المياه في جميع أنحاء العالم قد أدى إلى تلوث المياه الجوفية ، وبالتالي إلى تدهور نوعية موارد المياه الجوفية مما يشكل تهديداً للصحة العامة. إن رسم خرائط لمخاطر تلوث المياه الجوفية يعتبر أداة هامة لحماية المياه الجوفية ، ولإدارة استخدام الأراضي ومن أجل الصحة العامة.
هذه الدراسة تقدم طريقة جديدة لرسم خرائط مخاطر تلوث المياه الجوفية ، اعتماداً على الخصائص الهيدروجيولوجية، استخدامات الأراضي، مصادر تلوث المياه ونمذجة المياه الجوفية.
تم تطبيق هذه الطريقة على منطقة قطاع غزة في فلسطين ، كدراسة حالة، و تمت معالجة البيانات ورسم الخرائط اللازمة مثل خريطة قابلية التلوث وخريطة أثر التلوث باستخدام أداة التحليل المكاني في نظام المعلومات الجغرافي، وقد تم استخدام نموذج لحركة المياه الجوفية، وذلك لتحديد المناطق الواقعة تحت تأثير ضخ آبار المياه الجوفية العامة.
لقد أظهرت نتائج هذه الدراسة أن المناطق ذات المخاطر العالية هي تلك الواقعة في مدن خان يونس ورفح في جنوب قطاع غزة، كما أظهرت أن معظم آبار المياه الجوفية العامة تقع في مناطق متوسطة المخاطر، وأن أربعة آبار تقع في منطقة عالية المخاطر.
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Baalousha, H.M. Mapping groundwater contamination risk using GIS and groundwater modelling. A case study from the Gaza Strip, Palestine. Arab J Geosci 4, 483–494 (2011). https://doi.org/10.1007/s12517-010-0135-0
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DOI: https://doi.org/10.1007/s12517-010-0135-0