Sea Water Intrusion in Estuaries Article Example | Topics and Well Written Essays - 750 words

Sea Water Intrusion in Estuaries - Article ExampleThe results obtained using the impersonate includes the measure of water level, discharge and salinity level. These kick in shown good agreement with the observed results. Also, a direct relationship between longitudinal salt dispersion with flood-ebb loop length and tidal efficiency is withal confirmed in this study (Nguyen et al, 2008b). The prediction of the salinity distribution in the complex situations like multi-channel estuaries like Mekong delta have alike been reported in the belles-lettres (Nguyen and Savenije, 2006).Mekong delta is unique in its character. It has large number of branches and transports huge quantity of water (2000 cu.m per second) even during summer. The prediction model is framed on the principle that the multi-channel estuarine dodge would function as single entity and the paired branches could be appropriately combined to one. The results obtained from the analysis show that steady state models co uld predict the salinity levels very well. They could also explain the equilibrium conditions established in the estuaries during variable flow period especially during the dry seasons. Also, authors have computed the system response time for Mekong also. The data apply in the paper was collected during the period 1991 to 1998. As Mekong delta is a very active morphologically, its topography too is undergoing continuous change due to the transport of sediments through the river. Hence, the model would require continuous improvement by incorporating the recent topographical details. Further, the model also has parameters like mean estuary depth and river discharge that have high score of uncertainty (Nguyen and Savenije, 2006).Determination of fresh water discharge is essential for quantification of salinity distribution. In the model of very low flows the salinity distribution is observed to be maximum. But the low fresh water flows coupled with high tidal flows make the accurate estimate of fresh water discharges very difficult. And in the case of Mekong delta, the multi channel characteristics make the accurate direct determination of discharge computation very cumbersome. A reliable model has been proposed to estimate the river discharge under the preceding(prenominal) situations (Nguyen et al, 2008a). The principle applied in this process is the reverse calculation, from the known values of salinity distribution the authors have developed equations to determine the river discharge. In this connection, two transgress approaches have been attempted for different clusters of rivers in this basin. In the first approach, based on the information on the salinity distribution and estuarine shape of for each one branch the discharge in the individual branches is computed. And in the other approach, from the combined shape of estuarine branches and the salinity distribution, the combined discharge is estimated. These analytical models could be apply to compu te the river discharges in multi channel estuarine regions by collecting the salinity distributions (Nguyen et al, 2008a). ReferencesNguyen, A.D. and Savenije, H.H.G Salt intrusion in multi channel estuaries a case study in Mekong delta, Vietnam, Hydrology and Earth System Sciences, 10, 2006, 743 -754.Nguyen, A.D., Savenije, H.H.G, Pham, D N and Tang, D T, Using salt intrusion measurements to determine the freshwater discharge distribution over