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The differences at the LG site were primarily in one depression (LG_d2), which plotted closer to the LMWL than the other depressions and closer to the rainfall value for the preceding month.
The slope of the lines did, however, differ slightly between mounds and depressions, as did the calculated intercepts with the LMWL (Table 1).
After plotting the isotopic data of both spring and groundwater in a [delta][sup.18]O versus [delta][sup.2]H scattergram (Figure 5), it is observed that the samples are well situated along the LMWL, therefore suggesting a complete meteoric origin of fresh, brackish, and hypersaline groundwater.
LMWL is the Local Meteoric Water Line ([[DELTA].sup.2]H = 6.78[delta][sup.18]O + 3.65), and GMLW is the Global Meteoric Water Line .
Furthermore, all groundwater samples are scattered around the LMWL indicating that the recharge of the Ras Jbel shallow aquifer originates from infiltration of recent precipitation from Mediterranean vapor masses.
The most depleted samples in the Local Meteoric Water Line (LMWL) are from precipitation in the Andes (Hoke et al., 2013), as a consequence of the altitude effect, while the most enriched samples are from rain in the eastern lowlands (Aranibar et al., 2011) (Fig.
For example, greater isotopic fractionation of [sup.18]O than [sup.2]H with evaporation during rainfall or snow fall results in a disproportional enrichment of [sup.18]O relative to [sup.2]H in the precipitation and results in a lower slope for the LMWL (figure 1).
Caption: Figure 7: (a) Relationship of [delta][sup.18]O and [[delta].sup.2]H in groundwater with the GMWL and LMWL at Xinzhou and Shenzao; (b) [[delta].sup.2]H-Cl diagram; and (c) [delta][sup.18]O-Cl diagram.
Meanwhile, the [[delta].sup.18]O-[delta]D plots of the samples from the springs nos.1, 3, and 4 approached the LMWL (Local Meteoric Line) after sizeable shift in June 2008, and the similar variation happened for the spring no.
The points representing shallow groundwater were closer to the LMWL, and the phenomenon was more obvious in Figure 3(b) (wet season).
The [[delta].sup.18]O and [[delta].sup.2]H values of Group 1 samples were mostly scattered around the LMWL, suggesting that atmospheric precipitation was their predominant origin.
The samples collected in the mainland area (i.e., Zhanjiang city area) are mainly located along the GMWL and LMWL, indicating that the confined groundwater in the mainland area is of meteoric origin.
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