Open AccessWater quality at Cai river mouth and Tac river mouth, Nha Trang bay (2015–2019)
Author(s) -
Ngoc Pham Hong,
Phu Le Hung,
Van Do Anh,
Thu Nguyen Hong,
Dung Le Trong,
Ha Dao Viet
Publication year - 2022
Publication title -
vietnam journal of marine science and technology/vietnam journal of marine science and technology (vietnam academy of science and technology)
Language(s) - English
Resource type - Journals
ISSN - 1859-3097
DOI - 10.15625/1859-3097/17037
Subject(s) - river mouth , environmental science , biochemical oxygen demand , water quality , bay , hydrology (agriculture) , nutrient , total suspended solids , pollution , suspended solids , chemical oxygen demand , water pollution , sediment , environmental chemistry , wastewater , environmental engineering , oceanography , ecology , geology , biology , chemistry , paleontology , geotechnical engineering
Deltas of large rivers, especially in arid areas, have been used from the ancient times for agriculture and are densely populated. In recent decades, many river deltas are experiencing an increasing anthropogenic impact, contamination of watersheds, and marine pollution caused by the offshore extraction of hydrocarbons. A combination of these factors determines a considerable research interest in river mouth areas. This paper presents the annual monitoring data on water environment of the two mouths of Cai river and Tac river, Nha Trang Bay during the period 2015 - 2019. Statistical data showed that there was an increase of dissolved oxygen demand (DO), biological oxygen demand BOD5, the concentrations of ammonia and Zn, Cu whereas the values of total suspended solid (TSS) and hydrocarbon (Cai river) and petroleum (Tac river) demonstrated a decrease. Generally, the average value of BOD5, concentrations Cu and Pb at Cai river mouth were lower than those at Tac river mouth, whereas the concentration of Zn was higher. Seasonal variation revealed that the concentrations of most of studied parameters, especially nutrients, were higher in rainy season. Overall, water environment of both mouths was qualified for aquaculture and aquatic organism preservation purposes except for the case of coliform.