Publication:
"Long-term water level dynamics in the Red River basin in response to anthropogenic activities and climate change "
"Long-term water level dynamics in the Red River basin in response to anthropogenic activities and climate change "
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Date
2023
Authors
Nguyen Hao Quang, Tran Quoc Viet, Ha Nam Thang , Nguyen Trinh Duc Hieu.
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Abstract
"Understanding the regular variations in water levels and identifying the potential drivers under the combined
pressures of anthropogenic activities and climate change can offer valuable insights into riverine management. In
this study, we analyzed long-term daily observational data, including water levels and water discharge, spanning
from the ~1950s to 2021 at seven gauging stations within the Red River basin. We investigated the spatio temporal variation in mean water levels using standard analytical tools, including the Mann-Kendall (MK) test,
rating curves, and Empirical Orthogonal Function (EOF). Specifically, we observed a notable and substantial
decline in water levels downstream of the major tributaries, including Da, Red, and Lo Rivers, as well as at their
confluence, starting at the end of 2008. Notably, a strong correlation between water levels and discharge is
found, highlighting the pivotal role of discharge in influencing water levels. Surprisingly, relationships between
water levels and climatic factors such as rainfall and air temperature proved less influential. This suggests that
water levels are predominantly shaped by discharge and anthropogenic activities, rather than climate change.
The study emphasized the substantial impact of human-induced activities, particularly dam operation and sand
mining, on downstream water levels in the Red River basin. An intriguing finding revealed that upstream dy namics, particularly at the Hoa Binh dam, led to significant water level increases with the same discharge, "
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Keywords
Red River system,
Water,
level,
EOF,
Dam,
Climate change