Abstract:
In this paper, some results of analyzing the hydrographic characteristics of the
seawater temperature and salinity are presented. The received results showed that: in
dry season, the influence of the Cai river water has is limited in Cai river estuary with
the approximate transferable distance from the river mouth to the open sea of about 1
km. The isohaline 32%o could be defined as the separate boundary of the Cai river
water; In rainy season, due to the river water discharges are high, the influence of Cai
river water could be transferred to the open sea and island areas. The immerge of the
Cai river water in the open sea areas in rainy season has changed the vertical structure
of salinity and temperature in the northern part of Nhatrang bay. In both seasons, the
Cai river water have influenced in the surface water layers 0 - 2m and the water layers
deeper than 2m are influenced by the sea waters with the salinity of higher than 32%o.