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

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