Water quality of submarine caves and marine karst lakes in Cat Ba Archipelago (Hai Phong, Vietnam)

Thi Thu Trang Cao; Dang Ngai Nguyen; Van Nam Le; Thi Kha Pham; Hai Ngoc Dinh; Manh Ha Tran; Van Minh Nguyen; Van Thao Dau

doi:10.15625/1859-3097/18632

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Authors

Cao Thi Thu Trang Institute of Marine Environment and Resources, VAST, Vietnam
Nguyen Dang Ngai Institute of Marine Environment and Resources, VAST, Vietnam
Le Van Nam Institute of Marine Environment and Resources, VAST, Vietnam
Pham Thi Kha Institute of Marine Environment and Resources, VAST, Vietnam
Dinh Hai Ngoc Institute of Marine Environment and Resources, VAST, Vietnam
Tran Manh Ha Institute of Marine Environment and Resources, VAST, Vietnam
Nguyen Van Minh Institute of Marine Environment and Resources, VAST, Vietnam
Dau Van Thao Institute of Marine Environment and Resources, VAST, Vietnam

DOI:

https://doi.org/10.15625/1859-3097/18632

Keywords:

Submarine caves, marine karst lakes, water quality, Cat Ba Archipelago

Abstract

Submarine caves and marine karst lakes in the Cat Ba archipelago (Hai Phong) were surveyed in June and November, 2019. The results showed that the water was weakly alkaline, the dissolved oxygen concentration was very low, most of the oxygen saturation in the water was in the range of 50–70%. Water in submarine caves had higher and more stable salinity than that in marine karst lakes, however, the dissolved oxygen concentration was lower than that in lakes. The self-purification of water was better in the rainy season. The water was polluted by ammonium in the rainy season in Ang Vem, Ba Man, Ba Mat and Ang Gay lakes. There is no evidence of organic contamination but the high nitrate and phosphate concentration had been recorded. The presence of H₂S gas in the water had begun to affect organisms.

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