Application of Vertical Electrical Sounding for Delineation of Sea Water Intrusion into the Freshwater Aquifer of Southern Governorates of Gaza Strip, Palestine

Zeyad Hassan Abu Heen, Shehda Muhsen

Abstract


Abstract

Vertical Electrical Sounding (VES) proved to be an important tool for mapping the freshwater-saltwater interface. Seawater intrusion is serious problem especially in coastal areas. 14 Vertical electrical soundings with Schlumberger array were carried out (perpendicular to the coast) in southern part of the coastal aquifer in Gaza Strip (Khan Younis and Rafah Governorates) to study the subsurface geologic formation and delineation of seawater intrusion into freshwater aquifer. Lithology and hydrochemistry data from 12 bore holes were used to integrate the results. The results reveals that 50% of the total sounding are interpreted of 3 layer modes, while the other 50% are of 4 layers model. Interpreted 2D geoelectrical models (in two cross sections parallel to the coast line) showed that seawater intrusion with electrical resistivity less than 2Ωm is dominant along the section parallel to coast line at 400m east of it and for shallow depths (3-10m depth), while in the other section (1000m) east of the coast line seawater intrusion is detected in some places while the other parts still have brackish/fresh groundwater with resistivity more than 10Ωm at different depths (26-50m).

ملخص:

اثبتت طريقة المقاومة الكهربائية العمودية (VES)  فعاليتها فى تحديد الحدود الفاصلة بين المياه العذبة و المالحة . تعتبر مشكلة تداخل المياه المالحة فى مياه الخزان الجوفى العذب مشكلة ذات اهمية و خاصة فى المناطق الشاطئية. لقد تم تنفيذ 14 مجسة كهربائية عمودية بأستخدام تشكيل شلمبرجير بشكل قطاعات عمودية على على الساحل الجنوبى لقطاع غزة (محافظات خانيونس و رفح) و ذلك بهدف دراسة التركيب الجيولوجى للخزان الجوفى و تحديد مدى تداخل مياه البحر فيه . كما تم الاستعانة بالمعلومات الليثولوجية و الهيدروكيميائية من 12 بئرمياه فى مناطق الدراسة. اظهرت النتائج ان 50% من منحنيات المقاومة الكهربائية المقاسة تمثل نموذج لثلاث طبقات جيولوجية بينما 50% تمثل اربع طبقات. تم اختيار قطاعين متوازيين و موازين لشاطىْ البحر, يبعد الاول 400 م عن الشاطىْ بينما الاخر يبعد 1000م عنه لدراسة تغيرات المقاومة فى بعدين. أظهرت النتائج ان مياه الحر ذات المقاومة الكهربائية أقل من 2 أوم.متر تسود على طول القطاع القريب من الشاطىْ و لاعماق ضحلة (3-10 م), بينما فى القطاع الثانى و الذى يبعد 1000م شرقا تم تحديد أمكن تداخل مياه البحر المالحة فى بعض الاماكن و لم يتم تحديدها فى أماكن أخرى مما يفسر على انه لا زال تلك المناطق تحتوى على مياه عذبة/ مالحة ذات مقاومة كهربائية اكبر من 10 أوم.متر و على أعماق تتراوح بين 26-50 متر.


Keywords


Vertical electrical sounding; VES; sea water intrusion; geoelectrical; Gaza Strip; Palestine

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References


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