Synsedimentary folding process and transtensive tectonic during Late Miocene to Quaternary in northeastern Tunisia: case of Mateur–Menzel Bourguiba region     

Sofien Alyahyaoui  Hedi Zouari 《Arabian Journal of Geosciences》2014,7(11):4957-4973

The following paper presents an integrated approach of field observations and surface and subsurface data to precisely determine the geodynamic evolution during the Late Miocene of Mateur and Menzel Bourguiba region (northeastern Tunisia). Alternation between compressive and transtensive regime has been generated as a consequence of relative bringing of Africa and Eurasia plates. The first compressive regime controlled the Late Miocene M1 which edified folds and reverse faults. The second one during Late Miocene M2 was transtensive and remobilized E–W right lateral strike slip deep faults which generated the eastern Mateur distensional zone as a NW–SE releasing bend. The last compressive phase during Messinian and Pliocene–Early Quaternary has reactivated the E–W deep faults as right lateral strike slip movement with reverse component, the NE–SW faults were acted with reverse movement and the folding was accentuated. In this study, no deformation is observed affecting Middle Quaternary–actual series, but the compressive regime continues until the present according to the evidence existing in other regions of Tunisia.  相似文献   

Probabilistic model to forecast earthquakes in the Zemmouri (Algeria) seismoactive area on the basis of moment magnitude scale distribution functions     

Kamel Baddari  Said Makdeche  Fouzi Bellalem 《Acta Geophysica》2013,61(1):60-83

Based on the moment magnitude scale, a probabilistic model was developed to predict the occurrences of strong earthquakes in the seismoactive area of Zemmouri, Algeria. Firstly, the distributions of earthquake magnitudes M _i were described using the distribution function F ₀(m), which adjusts the magnitudes considered as independent random variables. Secondly, the obtained result, i.e., the distribution function F ₀(m) of the variables M _i was used to deduce the distribution functions G(x) and H(y) of the variables Y _i = Log M _0,i and Z _i = M _0,i , where (Y _i ) _i and (Z _i ) _i are independent. Thirdly, some forecast for moments of the future earthquakes in the studied area is given.  相似文献   

Determination of the interstitial velocity field in the swash zone by Ultrasonic Doppler Velocimetry (UDV)     

Mustapha Kamel Mihoubi  Michel Bélorgey  Ahmed Kettab 《Comptes Rendus Geoscience》2012,344(5):312-318

The experimental study of the hydrodynamics of the sediments and the physical analysis of the process of exchange at the water-sediment interface in a zone of swash are essential for the understanding of the sedimentary transport processes in coastal environments, in particular to control and forecast the evolution of the coastline. The objective of this study was to exploit the technique of Ultrasonic Doppler Velocimetry (UDV) to examine the evolution of the velocity field at the water-sediment interface in a zone of swash in various conditions of incidental regular waves in a wave flume. The velocities were measured in different conditions of the swash within the sediment bed, and in the fluid vein at the swash edge. These measurements show: an exponential distribution of velocities inside the sediment bed; a difference in the velocity gradient at the water-sediment interface, between the velocity in the water vein at the swash edge and the interstitial flow in the swash. The measurements obtained in the wave flume made it possible to observe an evolution of the velocity profiles according to the phases of the swash, which are characterized by a phase shift between the free flow at the swash edge and the interstitial flow during the two phases of the swash: uprush and backwash.  相似文献   

Natural and artificial recharge investigation in the Zéroud Basin,Central Tunisia: impact of Sidi Saad Dam storage   总被引：1，自引：0，他引：1  

Sarra Bel Hadj Salem  Najiba Chkir  Kamel Zouari  Anne Laure Cognard-Plancq  Vincent Valles  Vincent Marc 《Environmental Earth Sciences》2012,66(4):1099-1110

Hydrochemical and isotopic data of waters from the Zéroud aquifer have been used to potentially provide a means for locating occurrences and to trace movements of a variety of natural and anthropogenic recharge waters in the Zéroud Basin, Central Tunisia. Geochemical data have been measured during the dam water release, from May to September 2005, with a sampling time step of 15 days. An implication of dam water has been demonstrated that is noticeable up along the main flow path to a distance of 10 km far from the injection site. Environmental isotopes ²H, ¹⁸O and ³H of water molecule were studied to investigate the effect of dam water on the hydrological system, and an isotope balance was established to compute the contribution of water storage component in groundwater. Based on isotopic mass balance, we assess that an average of 13% of total groundwater in the upper aquifer came from dam water storage. Three distinctive recharge waters in the aquifer can be determined. Water from local rainfall (pre-dam Zéroud River) that infiltrated into the boundaries of the Draa Affane Mountain was easily distinguished from the water influenced by anthropogenic recharge located in the Zéroud right rivulet. Distinguishable isotopic signatures of native wadi Zéroud recharge due to “recent lineal recharge” through the riverbed were also identified.  相似文献   

Experimental Investigation on Spray Cooling Using Saline Water     

Nel  Christo  Guan  Zhiqiang  Lu  Yuanshen  Hooman  Kamel 《Mathematical Geosciences》2019,51(3):337-351

Mathematical Geosciences - Natural draft dry cooling towers (NDDCTs) are a type of cooling technology used in thermal power plants, including geothermal power plants. Interest from industry in this...  相似文献   

Mapping geology in Djelfa District (Saharan Atlas,Algeria), using Landsat 7 ETM+ data: an alternative method to discern lithology and structural elements     

Kamel Amri  Ghilles Rabai  Imene Meriem Benbakhti  Mohamed Nadir Khennouche 《Arabian Journal of Geosciences》2017,10(4):87

Djelfa area in the central Saharan Atlas is characterized by its high lithological diversity with different facies from the Triassic to the Tertiary. The lack of published geological maps of the region (Djelfa) prompted us to test specific processing of satellite images (ratio bands, principal component analysis) in order to establish a lithological discrimination of the region. Several treatments allowed us to map the lineaments highlighting the various tectonic structures of the region. The combination of field and remote sensing data pointed out the double influence of the E-W Eocene and N-S Miocene phases in the structuration of these regions. As a large part of the Djelfa area is inaccessible, the obtained results undeniably contribute to a better understanding of the local geology.  相似文献   

Insights and participatory actions driven by a socio-hydrogeological approach for groundwater management: the Grombalia Basin case study (Tunisia)     

C. Tringali  V. Re  G. Siciliano  N. Chkir  C. Tuci  K. Zouari 《Hydrogeology Journal》2017,25(5):1241-1255

Sustainable groundwater management strategies in water-scarce countries need to guide future decision-making processes pragmatically, by simultaneously considering local needs, environmental problems and economic development. The socio-hydrogeological approach named ‘Bir Al-Nas’ has been tested in the Grombalia region (Cap Bon Peninsula, Tunisia), to evaluate the effectiveness of complementing hydrogeochemical and hydrogeological investigations with the social dimension of the issue at stake (which, in this case, is the identification of groundwater pollution sources). Within this approach, the social appraisal, performed through social network analysis and public engagement of water end-users, allowed hydrogeologists to get acquainted with the institutional dimension of local groundwater management, identifying issues, potential gaps (such as weak knowledge transfer among concerned stakeholders), and the key actors likely to support the implementation of the new science-based management practices resulting from the ongoing hydrogeological investigation. Results, hence, go beyond the specific relevance for the Grombaila basin, showing the effectiveness of the proposed approach and the importance of including social assessment in any given hydrogeological research aimed at supporting local development through groundwater protection measures.  相似文献   

Quantifying regional groundwater flow between Continental Intercalaire and Djeffara aquifers in southern Tunisia using isotope methods   总被引：4，自引：0，他引：4  

Rim Trabelsi  Abir Kacem  Kamel Zouari  Kazimierz Rozanski 《Environmental Geology》2009,58(1):171-183

Large-scale interaction between the Continental Intercalaire and the Djeffara aquifer systems in the southeast of Tunisia has been investigated with the aid of chemical and isotopic tracers. Two distinct groundwater types have been identified: (1) the Continental Intercalaire groundwater characterized by elevated temperatures (50–61.4°C), low δ¹⁸O (−8.4 to−7.87) and δ²H (−67.2 to−59) values and negligible radiocarbon content, both testifying its great age dating from the late Pleistocene period, and (2) the Djeffara groundwater with distinctly heavier isotopic composition (δ¹⁸O = −8.31 to −5.80, δ²H = −65.9 to −31.9). The Djeffara groundwaters reveal a distinct changes of physico-chemical and isotopic parameters near El Hamma Faults in the northwestern part of the Djeffara basin. These changes could possibly be explained by a vertical leakage from the Continental Intercalaire aquifer through El Hamma Faults. The mixing proportions inferred from stable isotope mass balance prove that the contribution of the Continental Intercalaire to the recharge of Djeffara aquifer is very significant and may reach 100% in the El Hamma region and in the northern part of Gabes. Isotope tracers strongly suggest that recent recharge to the Djeffara aquifer system is very limited. Its current yield, particularly in its central and northern parts can be maintained only thanks to large-scale underground inflow from the Continental Intercalaire aquifer system, which carries late Pleistocene palaeowater. Consequently, current exploitation of groundwater resources of the Djeffara aquifer has non-sustainable character.  相似文献   

Geochemical study of groundwater mineralization in the Grombalia shallow aquifer,north-eastern Tunisia: implication of irrigation and industrial waste water accounting   总被引：2，自引：0，他引：2  

Amor Ben Moussa  Kamel Zouari  Naceur Oueslati 《Environmental Geology》2009,58(3):555-566

Hydrochemistry of groundwater is largely determined by both natural processes, such as dissolution, cation exchange, mixing, evaporation; and anthropogenic activities, which can affect the aquifer systems by contaminating them or by modifying their hydrological cycle. Both natural and anthropogenic processes vary in time and space; which is reflected in groundwater hydrochemistry variation. The objective of this study is the determination of the main hydrogeochemical processes that affect the quality of shallow groundwaters in the Grombalia basin, located in the Cap Bon Peninsula, north-eastern Tunisia. In this area, the chemical composition of groundwater is mostly characterized by Na–Cl–NO₃–Ca water type which reveals the implication of natural and anthropogenic major factors. Natural factors are dissolution of evaporatic minerals, i.e. halite and gypsum and cation exchange with clays, while anthropogenic factors are pollution with industrial Sr-rich waste water and return flow of irrigation water, highly contaminated by MgSO₄ and methyl-bromide fertilizers.  相似文献   

Estimating suspended sediment yield, sedimentation controls and impacts in the Mellah Catchment of Northern Algeria   总被引：1，自引：0，他引：1  

Kamel Khanchoul  Robert Altschul  Fella Assassi 《Arabian Journal of Geosciences》2009,2(3):257-271

This paper is an assessment of the suspended sediment yield in the Mellah Catchment of northern Algeria. We use discharge–sediment load relationships to explore the variability of water discharge and sediment load, and to investigate the impact of geomorphic factors disturbance on erosion and sedimentation. Suspended sediment load was analyzed in the Mellah Catchment (550 km²) which was controlled by a gauging station to measure discharge and sediment transport. The relations between daily mean sediment concentration and daily mean water discharge were analyzed to develop sediment rating curves. For storms with no water samples, a sediment rating curve was developed. The technique involves stratification of data into discharge-based classes, the mean of which are used to fit a rating curve according to single flow data and season to provide various rating relationships. The mean annual sediment yield during the 24 years of the study period was 562 T km^?2 in the Mellah Catchment. This drainage basin had high rainfall and runoff, the erosion was high. The high sediment yield in the Mellah basin could be explained by a high percentage of sparse grassland and cultivation developed on shallow marly silty-clayey soils with steep slopes often exceeding 12%. Almost all suspended sediment loads are transported during storm events that mainly occur in the winter and spring heavy and medium downpours. The scarceness of these events leads to a very large interseasonal variability of the wadi sediment fluxes. The negative impacts of this enhanced sediment mobility are directly felt in the western part of the basin which shows many mass movements, bank and gully erosion because cultivated areas are often bared during autumnal brief flash floods and furrowed downslope during the winter season.  相似文献