Three sampling stations were chosen along the lower reach section of AlSanawbarriver (Lattakia-Syria). In these stations, the freshwater molluscs were studied, environmentally and taxonomically, during the period 4/3/2012 – 4/8/2013.
In this resea
rch, I present the results of the environmental study on the Gastropod Valvatasaulcyiwhich was more abundant in the 3rd station; 5km of the estuary.
Ten mollusc species were identified; 8 belonging to Gastropoda (4 of Prosobranchia & 4 of Pulmonata) and 2 belonging to Bivalvia.
The chemical and physical properties of the water in the 3rd station were studied and the work was concentrated on Valvatasaulcyipopulation and structure, where samples were collected bimonthly during Spring, summer & autumn and monthly during winter. It was shown that reproduction of such species is continuous along the year, with 2 reproduction beaks: the more important one is spring beak and the less important one is autumn beak.
The population structure of the species was studied: shell dimensions were measured and the relationships were studied between height growth and breadth growth of the shell, and between the breadth growth and dry weight of the individual ….
This is a study of free groundwater level changes through time, and the level of its being affected by natural and artificial factors, which allows evaluating general water situation of the aquifer. This study shows that groundwater system in the stu
dy area from the type of water division line (climatic system) connects in direct connection with infiltration from rainfalls in which the natural factors (recharge) play the main role in forming the system of groundwater, in addition to the artificial factors (irrigation), and these factors yield three periods of the obvious terminal changes of the levels in hydrologic year (descending, stability, ascending). However, groundwater is renewable because of stability in the situations of this water, and its discharge to hydrodynamic net of groundwater in Al-kabir al-shimali and Al-snobar rivers and in the Mediterranean Sea as well.
This research discusses the way of defining hydogeological parameters by using
monitored data of the ground water system, for defining the values of these coefficients on
large areas, which has a practical significance especially in modeling the hy
drogeological
problems which allows explaining and checking the hydrodynamic and the
hydrogeological structures of the area and the reasons of changing the filteration properties
of the aquifer.
It appears that transmissivity varied from 36 to 570 m2/day, the permeability
from 1 to 53 m/day, and the water yield from low to medium between 0.00004 and 0.2
because of the rising of the coefficient of diffusion.
The filtration recharge approximately from 1 - 40% from the rain falls.
The obtained results are in good conformity with the geological characteristics -
structural and litologic - facies characteristics for the study area.
