A Deterministic Model for Predicting Hourly Dissolved Oxygen Change: Development and Application to a Shallow Eutrophic Lake

Abstract

Predicting dissolved oxygen (DO) change at a high frequency in water bodies is useful for water quality management. In this study, we developed a deterministic model that can predict hourly DO change in a water body with high frequency weather parameters. The study was conducted during August 2008-July 2009 in a eutrophic shallow lake in Louisiana, USA. An environment monitoring buoy was deployed to record DO, water temperature and chlorophyll-a concentration at 15-min intervals, and hourly weather data including air temperature, precipitation, wind speed, relative humidity, and solar radiation were gathered from a nearby weather station. These data formed a foundation for developing a DO model that predicts rapid change of source and sink components including photosynthesis, re-aeration, respiration, and oxygen consumption by sediments. We then applied the model to a studied shallow lake that is widely representative of lake water conditions in the subtropical southern United States. Overall, the model successfully simulated high-time fluctuation of DO in the studied lake, showing good predictability for extreme algal bloom events. However, a knowledge gap still exists in accurately quantifying oxygen source produced by photosynthesis in high frequency DO modeling.

Dissolved Oxygen and Aeration in Ictalurid Catfish Aquaculture

“…Some version of the Steele equation (Eq. ) has been used in mechanistic models to estimate the contribution of phytoplankton photosynthesis to pond or lake oxygen budgets (Meyer and Brune ; Baumert and Uhlmann ; Losordo ; Giovannini and Piedrahita ; Stefan and Fang ; Culbertson and Piedrahita ; Xu and Xu ). Values for Ph max vary significantly with phytoplankton species, cellular nutrient status, photoadaptation (biological adjustment of algal cells to changing light intensities, such as elaboration of nonchlorophyll accessory pigments to increase light absorption efficiency), and other factors (Senft ; Reynolds ).…”

“…where WCR is the water column respiration rate (mg O 2 /L/h); α wcr is a coefficient relating water‐column respiration rate to chlorophyll concentration (mg O 2 /μg chlorophyll a /h); and chl a is the water‐column chlorophyll a concentration (μg/L). The coefficient, α wcr , ranges from about 0.0015 to 0.0035 mg O 2 /μg chlorophyll a /h at a water temperature of 25 C (Smith and Piedrahita ; Xu and Xu ).…”

“…As summarized in the previous section, methods are available for estimating or measuring each variable in Equation . These methods – including underlying assumptions and sources of error – are detailed in various studies of aquaculture pond oxygen budgets (Boyd et al ; Romaire and Boyd ; Meyer and Brune ; Madenjian et al ; Losordo ; Smith and Piedrahita ; Madenjian ; Boyd ; Piedrahita ; Smith ; Teichert‐Coddington and Green ; Giovannini and Piedrahita ; Culbertson and Piedrahita ; Xu and Xu ).…”

Verification of Pisces Dissolved Oxygen Model Using in Situ Measurement in Biak, Rote, and Tanimbar Seas, Indonesia

“…The measured parameters were temperature, salinity, pH, DO, conductivity, total suspended solids, density, plankton, and nutrient data (Xu & Xu 2016). …”

Prediction model of pH value in mitten crab culture

“…Too low or too high pH values can lead to large scale mortality of cultured mitten crabs (Page et al, 2014). Therefore, it was found quite necessary to build a prediction model of pH of pond water (Xu and Xu, 2016), which could provide a basis to the farmers' for decision-making and thus optimise their operations as well as reduce economic losses. Many factors could lead to the change of pH value of rearing water in crab culture and hence prediction model of pH value is an open, dynamic and nonlinear system.…”