Application of geochemical tracers for the investigations of groundwater resources in semi-arid region (Central-East Tunisia)     

Amal Gammoudi  Rim Trabelsi  Kamel Zouari 《水文研究》2024,38(2):e15076

Groundwater resources in Mahdia-Ksour Essef region, located in the central-eastern part of Tunisia, suffer from intensive exploitation and degradation of water quality. The assessment of groundwater vulnerability, the well-understanding of geochemical processes and the investigation of groundwater quality variations are of particular importance for water resources management in this semi-arid region. The results of this multi-disciplinary investigation show that groundwaters of Mahdia-Ksour Essef region are flowing from El Jem and Boumerdes regions in the South, towards the Mediterranean Sea and the sebkha of Moknine in the North. The groundwaters are classified as either Na-Cl or Ca-SO₄. Stable oxygen and hydrogen isotope compositions (δ¹⁸O and δ²H) confirm a recharge by rapid water infiltration, evaporate surface water and water-rock interaction processes in the salinity increase. The rock-water interaction processes of the mineralization of groundwaters include the cation-exchange reactions and the dissolution of carbonates and evaporate. The high values of the water quality index (WQI) and of the total dissolved solids (TDS) (3.7–11 g/L) of these groundwaters indicate their unsuitability for drinking purpose. Moreover, the combination of the WQI, TDS and nitrate results prove the vulnerability of the studied groundwater to the anthropogenic pollution linked to agriculture and domestic activities and to the salt water contamination.  相似文献   

East-west stationkeeping requirements of 24-h satellites due to Earth's triaxiality and luni-solar effects     

Ahmed Aly Kamel 《Celestial Mechanics and Dynamical Astronomy》1975,12(4):425-438

Ignoring luni-solar perturbations, analytical solution for longitude deviation of the ‘stroboscopic’ mean center of 24-h satellites ground trace in the neighborhood of a prespecified station is obtained. The initial semimajor axis for two-maneuver east-west stationkeeping is then deduced. Finally, the luni-solar long and short period effects on this initial semimajor axis are discussed.  相似文献   

The construction of a seventh-order Jupiter-Saturn analytical theory     

Osman M. Kamel  Adel S. Soliman 《Earth, Moon, and Planets》1993,60(2):141-175

We extend the construction of the Jupiter-Saturn theory to include all the terms up to the seventh order in the masses. The Hori-Lie transformation technique is employed. The Jacobian coordinates are adopted and the theory is expressed in terms of the canonical non-singular variables of H. Poincaré.  相似文献   

The construction of a third order secular     

Osman M. Kamel  Abdel Aziz Bakry  Salwa M. Waziry 《Earth, Moon, and Planets》1994,65(2):97-117

In this part we find out the 24 equations of secular perturbation equations for the subsystem J-S-U-N. The solution of these equations by the Lagrange-Laplace procedure and the Eigen value Eigen vector is analysed. Also we refer to Hurwitz theorem to test stability.  相似文献   

The construction of a general third-order planetary theory     

Osman M. Kamel 《Earth, Moon, and Planets》1982,26(1):47-60

We review in this part the outline of a third-order general planetary theory established through Von Zeipel's method and in terms of Poincaré's canonical variables We consider our system to consist of the Sun as the primary body, one disturbed planet, and one disturbing planet.  相似文献   

Determination of secular terms in general planetary theory     

Osman M. Kamel 《Earth, Moon, and Planets》1988,43(3):271-273

A method to calculate secular terms of the two parts of the planetary disturbing function— when it is expressed in terms of the true anomalies or the eccentric anomalies instead of the mean anomalies - is described. Also an alternative method is outlined.  相似文献   

Expansion of the planetary mutual distance raised to any negative power by the method of symbolic differential operators     

Osman M. Kamel 《Earth, Moon, and Planets》1996,74(1):1-6

We present a literal approach to evaluate ^–s necessary for the construction of high order planetary theories. This approach is valid to be applied on very large scale digital computers with standard Poisson series programs, for high order and high degree planetary theories. We apply the method of symbolic differential operators for single variable functions, and the binomial theorem expansions, for the evaluation of ^–s . We utilize Laplace coefficients and its derivatives to carry out the development, without dealing with Newcomb operators or Hansen's coefficients.  相似文献   

On the elimination of the critical term in a general first-order Uranus-Neptune theory     

Osman M. Kamel  Abdel A. Bakry 《Earth, Moon, and Planets》1981,24(3):261-279

A solution of the Uranus-Neptune planetary canonical equations of motion through the Von Zeipel technique is presented. A unique determinging function which depends upon mixed canonical variables, reduces the 12 critical terms of the Hamiltonian to the set of its secular terms. The Poincaré canonical variables are used. We refer to a common fixed plane, and apply the Jacobi-Radau set of origins. In our expansion we neglected terms of power higher than the fourth with respect to the eccentricities and sines of the inclinations.  相似文献   

The expansion of negative powers of mutual distance between two planets     

Osman M. Kamel  Adel S. Soliman 《Earth, Moon, and Planets》1990,49(1):25-56

In this part we obtain the expression for ^–s by the application of Smart's method, which involves Taylor's theorem for functions of several variables. We neglected terms of power higher than the fourth with respect to eccentricities and tangents of inclinations.  相似文献   

The elimination of the critical terms of a first order Uranus-Neptune theory through Hori's method     

Osman M. Kamel 《Earth, Moon, and Planets》1982,27(4):407-415

An outline for the elimination of the critical terms of a first order Uranus-Neptune theory is presented with a stress on the application of Hori's procedure to the problem.  相似文献