Monitoring:Eutrophication

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Modeling Application: Eutrophication

Objective

The objective of this[1] study was to quantify the mass transport, thermal stratification, and water quality variations in the Te-Chi Reservoir (in the temperate climates) and the Tseng-Wen Reservoir (in the sub-tropical climates) in Taiwan using CE-QUAL-W2. More specifically, the model results were used to quantify the cause-and-effect relationship between nutrient loads and water quality in these two reservoirs.

Data Needs

Te-Chi and Tseng-Wen Reservoirs, Taiwan
  1. Initial Conditions
    • The initial conditions that were used in the model are not specified in the report.
  2. Boundary Conditions
    • Time variable main inflow
    • Inflow Temperatures
    • Water Quality: Dissolved oxygen, chlorophyll a, total phosphorous, ammonia, and nitrite/nitrate concentrations at the upstream ends of the main stem of the river. Additionally, concentrations of dissolved oxygen, chlorophyll a, and nutrients in the tributaries were incorporated.
    • Meteorological Data: Includes air temperature, dew point temperature, wind speed, wind direction, and cloud cover

Monitoring Needs

  1. In-Pool/In-Situ Data
    • Water temperature profiles
    • Dissolved oxygen profiles
  2. Water Budget
    • Time-variable water surface elevation data


Te-Chi Reservoir: The water quality of Te-Chi reservoir has been routinely monitored during the past three decades, at a frequency of once a season since 1998. There are 15 water-quality sampling stations in the reservoir and its tributaries. Monitoring includes:

  1. Water temperature
  2. Dissolved oxygen
  3. Chlorophyll a
  4. Nutrients
    • Total phosphorous
    • Ammonia-nitrogen
    • Nitrite/Nitrate nitrogen

Tseng-Wen Reservoir: There are 16 water quality sampling stations within the reservoir and its nine tributaries. The water quality sampling monitoring has been conducted once a month since 1999. Water quality monitoring consists of the same parameters as is indicated for Te-Chi Reservoir.

Reference

  1. Kuo, J.T., Lung, W.S., Yang, C.P., Liu, W. C., Yang, M.D., Tang, T.S., 2005. "Eutrophication modelling of reservoirs in Taiwan," Environmental Modelling and Software 21 (2006) 829-844. Go