University of Science, 227 Nguyen Van Cu Str., Dist. 5, Ho Chi Minh City, Vietnam.
Vietnam National University Ho Chi Minh City, Linh Trung Ward, Thu Duc Dist, Ho Chi Minh City, Vietnam.
Environ Sci Pollut Res Int. 2022 Jan;29(5):7117-7126. doi: 10.1007/s11356-021-16235-w. Epub 2021 Aug 31.
This paper aimed at examining the climate variability and land-use change effects on streamflow and pollutant loadings, namely total suspended sediment (TSS), total nitrogen (T-N), and total phosphorus (T-P), in the Sesan, Sekong, and Srepok (3S) River Basin in the period 1981-2010. The well-calibrated and validated Soil and Water Assessment Tool (SWAT) was used for this purpose. Compared to the reference period, climate variability was found to be responsible to a 1.00% increase in streamflow, 2.91% increase in TSS loading, 11.35% increase in T-N loading, and 19.12% reduction in T-P loading for the whole basin. With regard to the effect of land-use change (LUC), streamflow, TSS, T-N, and T-P loadings increased by 0.01%, 3.70%, 10.12%, and 10.94%, respectively. Therefore, the combination of climate variability and LUC showed amplified increases in streamflow (1.03%), TSS loading (7.09%), and T-N loading (25.05%), and a net effect of decreased T-P loading (10.35%). Regarding the Sekong and Srepok River Basins, the streamflow, TSS, T-N and T-P showed stronger responses to climate variability compared to LUC. In case of the Sesan River Basin, LUC had an effect on water quantity and quality more strongly than the climate variability. In general, the findings of this work play an essential role in providing scientific information to effectively support decision makers in developing sustainable water resources management strategies in the study area.
本文旨在探讨 1981-2010 年间塞桑、塞公和斯雷博克（3S）流域气候变率和土地利用变化对径流量及污染物负荷（即总悬浮固体（TSS）、总氮（T-N）和总磷（T-P））的影响。为此目的，使用了经过良好校准和验证的土壤和水评估工具（SWAT）。与参考期相比，气候变率导致整个流域径流量增加 1.00%，TSS 负荷增加 2.91%，T-N 负荷增加 11.35%，T-P 负荷减少 19.12%。至于土地利用变化（LUC）的影响，径流量、TSS、T-N 和 T-P 负荷分别增加了 0.01%、3.70%、10.12%和 10.94%。因此，气候变率和 LUC 的结合导致径流量（1.03%）、TSS 负荷（7.09%）和 T-N 负荷（25.05%）显著增加，T-P 负荷净减少（10.35%）。就塞公河和斯雷博克河流域而言，与 LUC 相比，气候变率对径流量、TSS、T-N 和 T-P 的影响更大。就塞桑河流域而言，LUC 对水量和水质的影响比气候变率更为显著。总的来说，本研究的结果在为决策者提供科学信息方面发挥了重要作用，有助于在研究区域有效支持制定可持续水资源管理战略。
