Modeling Spatial Patterns of Dissolved Oxygen and the Impact Mechanisms in a Cascade River

• DOI: 10.3389/fenvs.2021.781646
• Publication Date: 2021-12-15T11:38:57Z
• Authors: Ming Zhong; Shanxia Liu; Kun Li; Huabo Jiang; Tao Jiang; Guoping Tang
• Keywords: Biochemical oxygen demand; River ecosystem; Limiting oxygen concentration

Dissolved oxygen (DO) concentration is an essential indicator for assessment of river ecosystems. A hydrodynamic and water quality mathematical model coupling one-dimensional two-dimensional models developed in this study. The characteristics study area, flow velocity, temperature, organic contamination are taken as consideration the scenario setting. changing processes DO simulated different scenarios, effects on discussed. Results indicate that: 1) negative relation was present between Yongjiang River releasing discharge Laokou hydro-project, since reoxygenation greater than consumption along river, increases from upstream to downstream. 2) with water, which also varies biochemical demand (BOD) concentration. exhibits greatest increase BOD, ranges 0.1 mg/L 0.75 3) increasing temperature results increased a decrease consumption. Our shows that 19°C 29 °C, correspondingly saturated decreased 9.25 7.54 mg/L. provides scientific support ecology operation cascade expected improve environment by reservoir regulation.