Spatial and temporal variabilities of surface water and sediment pollution at the main tidal-influenced river in Ca Mau Peninsular, Vietnamese Mekong Delta
15/06/22 09:10AM
Le Van Muoi, Chotpantarat Srilert, Van Pham Dang Tri, et al. Journal of Hydrology: Regional Studies, 41: 101082, 2022. More information http://doi.org/https://doi.org/10.1016/j.ejrh.2022.101082.
Abstract:
Study region Ganh Hao River, Ca Mau Peninsular, Vietnamese Mekong
Delta. Study focus The study was conducted to determine the extent of
pollution by physicochemical parameters and heavy metals through
seasonally sampling of the river. The water quality was compared with
international and Vietnamese standards, while sediment quality was
compared with the Vietnamese standard and pollution indices
(Geo-Accumulation Index, Contamination Factor, and Pollution Load
Index). The principal component analysis (PCA) was employed for
explaining the main factors responsible for observed levels of water
pollution. The oscillations due to tidal cycles and seasonality were
also evaluated by statistical comparison. Based on the logistic
regression models, the temporal variability of selected water quality
parameters was visualized using QGIS. New hydrological insights The
results showed that the concentrations of nutrients and organic
compounds exceeded the allowable standards for surface water quality.
The concentrations of heavy metals were below the allowable standard for
sediment quality and consistent with the background levels. The
influences of the tidal regime and seasonality caused significant
changes in water quality. Aquaculture practices and tidal regimes
accounted for 79.84% of the total variance in water quality
characteristics. The extensive and improved-extensive shrimp culture
activities were identified in relation to the variation in water
quality, and water quality maps highlighted pollution hotspots. The
research results could be useful not only to policymakers in developing
water resources management strategies but also likely widespread
implications for other rivers beyond the geographical regions.
