عملية الإذابة بين الطبقات الجبسية والمياه الجوفية شمال مدينة الموصل وتأثيرها على نوعية المياه الجوفية والمباني المشيدة ...

عملية الإذابة بين الطبقات الجبسية والمياه الجوفية

شمال مدينة الموصل

وتأثيرها على نوعية المياه الجوفية والمباني المشيدة

المهندس طه حسين السالم

ﺠﺎﻤﻌﺔ اﻟﻤوﺼل - ﻤرﮐز اﻟﺘﺤﺴس اﻟﻨﺎﺌﻲ - اﻟﻤوﺼل - اﻟﻌراق

ندوة إدارة الكوارث وسلامة المباني في الدول العربية

2008

Dissolution Between Gypsum Beds and Ground Water North of Mosul City and Its Effect On Quality of Ground Water and Constructions

Taha Hussein Al-Salim

Remote Sensing Center, University of Mosul , Mosul , Iraq

Abstract : 

  Dissolution process of gypsum lithological units in Al-Fatha Formation due to the ground water flow and infiltrated rainfall, has important role in the pollution of ground water and enlargement of fissures and channels within gypsum units and consequently collapse of overburden formation could be happened and constructions such as buildings, dams could be affected.

  Confirmation of dissolution process between ground water and gypsum was done by analyzing ground water samples to determine the concentration of SO4 for two periods along the year, and other cations and anions for its suitability for different uses were also determined. The chemical characteristics of ground water samples North of Mosul city have been studied through the chemical analysis of (13) water samples to evaluate the quality of ground water for determining its suitability for domestic and agricultural uses. Physical and chemical parameters of ground water samples such as Ec, pH, TDS, Na. K, Ca, Mg, HCO3, SO4, NO3,Cl and TH were determined.

  Lithological unit of Al-Fatha, Injana and Quaternary aquifers were identified and examined from wells that have been distributed over the area of study and showing the reputation of gypsum strata along the bore hole depth. Gypsum and anhydrite represent the dominants constituents of the rock belonging to Al-Fatha formation.

  Ground water of the study area is replenished from rainfall and valleys draining water to the catchment.

  Hydrochemical parameters are analyzed graphically by using Piper diagram to show the suitability, type and the geochemical evolution of the ground water. Richard and Wilcox classifications are also used to show the suitability of ground water for irrigation

  The concentration of SO4 show high difference between the two periods, and this will confirm that natural dissolution process take place between ground water flow and gypsum with time.

  Ground water chemistry of the study area indicates that most ground water samples are of CaSO4 and CaHCO3 water type, and have high total hardness and TDS, and generally low alkaline in nature.

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