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# One-dimensional steady-state model of river: online calculation of cross-section pollutant concentration, EIA calculation

Category:

### App Description

One-dimensional steady-state model of river: calculation formula for cross-section pollutant concentration

$$c=c _0 \times exp[-(K _1+K _3) \times \frac{x}{86400u}]$$

• c---calculate the pollutant concentration of the section, mg/L;   * c0---initial point pollutant concentration, mg/L;   * K1---oxygen consumption coefficient, 1/d;   * K3---sedimentation coefficient, 1/d;   * u---river flow rate, m/s;   * x---the distance from the calculation of the initial point to the downstream calculation section, m.

### Usage example

Input data:

C0—calculate initial point contaminant concentration: 4

K1 - oxygen consumption coefficient: 5

K3—sedimentation coefficient: 6

U—rival flow rate: 9

X—distance from the calculation of the initial point to the downstream calculation section: 20

Click "Calculate" to output data

Contaminant concentration of section: 3.9988684728316075

### Note

K1, K3 unit 1/d is the reciprocal of the day, because the coefficient K is finite, it must be multiplied by 1/d to meet the requirement.

Applicable object: For general rivers, the migration of pollutants due to push flow is much larger than the dispersion effect, and the dispersion effect can be neglected. Water quality prediction of small and medium-sized rivers with uniform concentration of pollutants in each section