CE4505 – Surface Water Quality Engineering CE4505 Surface Water Quality Engineering Modeling Lecture 2. Model Development.

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Presentation transcript:

CE4505 – Surface Water Quality Engineering CE4505 Surface Water Quality Engineering Modeling Lecture 2. Model Development

Empirical Models Secchi disk and chlorophyll (Chapra 1997, Figure 29.6) CE4505 – Surface Water Quality Engineering

Empirical Models Vollenwieder plot (Chapra 1997, Figure 29.1) CE4505 – Surface Water Quality Engineering

(Chapra 1997, Figure 29.4) Linked Empirical-Mechanistic Models CE4505 – Surface Water Quality Engineering

Mechanistic Mass Balance Models (Chapra 1997, Figure 1.5) CE4505 – Surface Water Quality Engineering

(Chapra 1997, Figure 18.8) Temporal Resolution CE4505 – Surface Water Quality Engineering

Spatial Resolution (Chapra 1997, Figure 16.1) CE4505 – Surface Water Quality Engineering

Time and Space Scale of Water Quality Problems (Chapra 1997, Figure 18.9) CE4505 – Surface Water Quality Engineering

Kinetic Resolution Total Phosphorus Available Particulate Phosphorus Refractory Particulate Phosphorus Dissolved Organic Phosphorus Soluble Reactive Phosphorus CE4505 – Surface Water Quality Engineering

Things should be made as simple as possible -- but no simpler. Albert Einstein image source: The Guiding Principle CE4505 – Surface Water Quality Engineering

unlimited cost cost cost +  $ desired reliability Model Complexity Model Reliability Defensible, Credible, Cost-Effective CE4505 – Surface Water Quality Engineering

Model Complexity Screening  Management  Research Striking a Balance CE4505 – Surface Water Quality Engineering

(Streeter-Phelps) Problems: untreated and primary effluent Pollutants: BOD Systems: streams and estuaries (1D) Kinetics: linear, feed forward Solutions: analytical Modeling: Historical Development (Chapra 1997) CE4505 – Surface Water Quality Engineering

(Computerization) Problems: primary and secondary effluent Pollutants: BOD Systems: streams and estuaries (1D/2D) Kinetics: linear, feed forward Solutions: analytical and numerical Modeling: Historical Development (Chapra 1997) CE4505 – Surface Water Quality Engineering

(Biology) Problems: eutrophication Pollutants: nutrients Systems: streams, lakes and estuaries (1D/2D/3D) Kinetics: nonlinear, feedback Solutions: numerical Modeling: Historical Development (Chapra 1997) CE4505 – Surface Water Quality Engineering

(Toxics) Problems: toxics Pollutants: organics, metals Systems: sediment-water interactions food chain interations, streams, lakes and estuaries Kinetics: linear, feed forward Solutions: analytical Modeling: Historical Development (Chapra 1997) CE4505 – Surface Water Quality Engineering

present (Ecosytems) Problems: ecosystem change, climate, invasives Pollutants: natural components – carbon, nutrients, organisms Systems: primary production, food web interactions Kinetics: nonlinear, feedback Solutions: numerical Modeling: Historical Development (Chapra 1997) Benthic Invertebrates Phytoplankton Whitefish CE4505 – Surface Water Quality Engineering