Continuous Water Quality Monitoring Continuous Water Quality Monitoring

Continuous Water. Quality Monitoring

Continuous Water Quality Monitoring Advantages n n n Needed in rapidly changing systems Provides better understanding of interaction between constituents Provides better understanding of transport processes Disadvantages n n n Equipment costs are greater Operation and maintenance costs are greater Vulnerable to damage and/or loss

Relations Between Parameters DO and p. H n n n DO and p. H track together Diurnal Pattern Why?

Relations Between Parameters DO and Temperature n n n Supersaturated DO DO crash in June Variation in DO changes seasonally

Relations Between Parameters Turbidity –vs- Discharge

Discrete vs Continuous Monitoring

Other Surrogate Possibilities n n n Continuous Parameter(s) Surrogate Constituent Specific Conductance TDS, Total Nitrogen Turbidity Suspended Sediment, Total Phosphorous Turbidity + Temperature Bacteria Relations are developed using discrete samples and linear regression Regression model used to synthesize continuous record of target parameters that are difficult to monitor. Parameter -vs- surrogate relations are not universal but site specific

Applications n Continuous monitoring the constituent or its surrogate to aid in identifying occurrence and duration of waterquality parameters that exceed regulatory limits.

Relation between SC and TN 1, 8 1, 6 1, 4 1, 2 Proposed Regulatory Limit = 1. 0 mg/L TN (mg/L) 1 0, 8 Difficult to monitor 0, 6 0, 4 ln(TN) Linear(ln(TN)) 0, 2 R 2 = 0, 902 0 0 -0, 2 -0, 4 100 200 300 Easy to monitor SC (u. S/cm) 400 500 600

Applications (cont) n n n Identify and optimize periods for sample collection Quantify constituent loads (volume/time) Familiarity with the site and data will lead to a better understanding of physical processes and interactions between constituents

QUESTIONS?