Hydrogeochemical modeling of the water seepages through Tannur Dam,southern Jordan     

Ali?El NaqaEmail author  Mustafa?Al Kuisi 《Environmental Geology》2004,45(8):1087-1100

This paper reveals the geochemical processes of dissolution, precipitation and cation exchange that took place during water–rock interaction between water seepages through the Tannur Dam. The Schoeller diagram indicates that there are three major water types originating during water–rock interaction. The first water type is characterized by low salinity that ranges from 1,300 to 2,800 µs/cm, which represents the reservoir water and the water in the right side of the central gallery. The second water type is in the left side of the central gallery, which exhibits medium salinity that reaches about 4,400 µs/cm. The third water type is characterized by very high salinity that reaches a value of around 8,500 µs/cm and represents the water in the right existing adit. The increase of salinity can be explained due to the dissolution of carbonate and sulfate minerals that form the matrix of the foundation and the abutment rocks, and the dissolution of the grout curtain, which is composed of cement and bentonite. Hydrogeochemical modeling, using a computer code PHREEQC, was used to obtain the saturation indices of specific mineral phases, which might be related to interaction with water seepages, and to identify the chemical species of the dissolved ions. The thermodynamic calculations indicate that most of the water samples were undersaturated with respect to gypsum, anhydrite and halite, and were saturated and/or supersaturated with respect to calcite and dolomite. Ca(HCO₃)₂ is the primary water type, as a result of dissolution of carbonate minerals such as calcite and dolomite prevailing at the dam site. However, cation-exchange processes are responsible for the formation of the Na₂SO₄ water type from the CaSO₄ type that formed due to the dissolution of gypsum.  相似文献   

A shallow fault-zone structure illuminated by trapped waves in the Karadere–Duzce branch of the North Anatolian Fault, western Turkey     

Yehuda Ben-Zion  Zhigang Peng  David Okaya  Leonardo Seeber  John G. Armbruster  Naside Ozer  rew J. Michael  Serif Baris  Mustafa Aktar 《Geophysical Journal International》2003,152(3):699-717

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Police, politics, and the right to the city   总被引：1，自引：0，他引：1  

Mustafa Dikeç 《GeoJournal》2002,58(2-3):91-98

Space and spatiality have recently been at the core of debates concerning the political possibilities of the city. The arguments advanced in this paper might be seen as an attempt to contribute to these debates through a reflection on the spatiality of (in) justice, politics, and the right to the city. The case of French urban policy, with its focus on distressed urban areas, and the `suburban problem' in France are used as examples to make arguments more concrete.  相似文献   

γ-Rays from Her X-1     

Jeffrey M. Cohen  Errol Mustafa 《Astrophysics and Space Science》1986,128(2):355-361

Recent observations have detected bursts of extremely high energy pulsed (1.24 s)-rays (10¹² eV to 5×10¹⁴ eV) from Her X-1. We propose a model for producing these-rays.  相似文献   

Seismic stratigraphy of Late Quaternary sediments of western Mersin Bay shelf, (NE Mediterranean Sea)     

Mahmut Okyar  Mustafa Ergin  Graham Evans   《Marine Geology》2005,220(1-4):113-130

High-resolution shallow seismic-reflection profiles obtained from the western Mersin Bay have revealed the existence of the two distinct depositional sequences (C and B) lying on a narrow and relatively steeply-sloping continental shelf which mainly receives its sediments from the ephemeral rivers. The upper Holocene sedimentary sequence (C) is characterized by stratified (simple to complex) to chaotic reflection configurations produced by the development of a prograding wedge of terrigenous sediment. Particular occurrences of slope- and front-fill facies and the lack of a sharp boundary, which has, however, been observed on the western shelf of this bay, between the Early Holocene and latest Pleistocene deposits are related to possible movement of underlying deposits due to local gravity mass movements or synsedimentary tectonics due to adjustment of the underlying evaporites in adjacent basin. The maximum thickness of the topmost sequence C is associated with the Tarsus–Seyhan delta, which lies to the northeast of the area and is prograding along the shelf. Other variations in thickness (5–40 m) of this topmost sequence are related to the variable sediment discharge along the coast, and the distance from the coast. It is at a maximum (40 m) in the nearshore area just west of the Lamas river mouth and at a minimum (5–15 m) in the offshore area.

The lower depositional pre-Holocene sequence (B) is characterized by continuous to wavy reflection configurations and how some cyclicity, suggesting coarse, heterogeneous sediments deposited under high energy conditions (fan-deltas) of Plio-Pleistocene age.

The combined interpretation of seismic reflection profiles with the available bore-hole data reveals the existence of a widespread Miocene acoustic basement (A) off the Susanoğlu–Tırtar coasts and Karapınar–Gilindirez rivers mouths. Unusual features in some profiles suggest the escape of coastal freshwater into the accumulating sediment.  相似文献   

Deep and shallow structures of large pockmarks in the Turkish shelf, Eastern Black Sea   总被引：2，自引：1，他引：2  

Günay Çifçi  Derman Dondurur  Mustafa Ergün 《Geo-Marine Letters》2003,23(3-4):311-322

Circular and elongated pockmarks are present between 180- and 300-m water depths in the Eastern Black Sea shelf. The circular pockmarks have diameters of 50–120 m and the elongated pockmarks are 150–200 m wide with crater depths of 10–25 m. In deeper sediments, buried pockmarks were vertically stacked, indicating that the pockmarks developed under periodically varying overpressure conditions driven by the seismologically active North Anatolian Fault. Linear elongated pockmarks were formed by downslope tensional stretching, which caused linear weak zones together with strong seafloor currents acting as a connector of circular pockmarks.  相似文献   

Short Note: Strain invariants     

Petr Vaníček  Erik W. Grafarend  Mustafa Berber 《Journal of Geodesy》2008,82(4-5):263-268

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Optimal Design of Ground-Water Capture Systems Using Segmental Velocity-Direction Constraints     

Steven A. Ratzlaff  Mustafa M. Aral  Faiz Al-Khayyal 《Ground water》1992,30(4):607-612

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Modelling the root zone soil moisture using artificial neural networks,a case study     

Mustafa Al-Mukhtar 《Environmental Earth Sciences》2016,75(15):1124

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Management options for a multipurpose coastal aquifer in Oman     

Ali Al-Maktoumi  Mustafa El-Rawy  Slim Zekri 《Arabian Journal of Geosciences》2016,9(14):636

Using MODFLOW 2005, this study numerically evaluated the effects of managed aquifer recharge (MAR) using treated wastewater (TWW) in managing the Al-Khawd coastal aquifer northeast of Oman. Our primary objective is to increase the urban water supply and to sustain the aquifer service with the lowest possible damage to the aquifer. A number of managerial scenarios were simulated and progressively developed to reduce seawater intrusion and outflow of the groundwater to the sea. An economic analysis was conducted to characterize the trade-off between the benefits of MAR and seawater inflow to the aquifer under increased abstraction for domestic supply. The results show that by managing irrigation wells and relocating public wells in conjunction with MAR practices, the abstracted volume for drinking purposes could be doubled. Even though injection of TWW is more expensive (due to the injection cost), it was observed to result in greater benefits. The results indicate that managing the aquifer would produce a net benefit ranging from $8.22 million (scenario 7) to $15.21 million (scenario 4) compared to $1.57 million with the current practice. In conclusion, MAR using TWW is a feasible solution to develop water resources in arid regions, and the best scenario depends on the decision maker’s preference when weighing the benefits of MAR and the level of damage to the aquifer. MAR could help manage stressed aquifer systems in arid zones to maximize the benefit of using the water for domestic purposes while minimizing the damage to the aquifer.  相似文献