Water Resources Management-A serious issue

Water Quality Modeling-A useful tool

Pick the right model-Complicated models or simple

Model Calculation

Model Description

Introduction

Hydraulic Model – HEC-RAS model

Case I--S-P & Qual2K Simulation with HEC-RAS Dilution Correction

題目： River Water Quality Modeling講者： Ming Chi University of Technology 范致豪 Ph. D.時間：民國 101 年 5 月 2 日

Key - pollution loadings BOD is the major pollution loading. A simple model may be as helpful as complicated one. Combined utilization of the water quality and hydraulic models may be an alternative to assess water quality accurately for a tidal river.

指導教授：陳彥璋學生：林威再、曾明義 製

Graduate Institute of Civil and Disaster Prevention Engineering

Conclusion

Case II--Modified SP Simulation

Simple and popular

Limited water quality data

Pollution loadings analysis - BOD

River hydraulic characteristic constants--Atmospheric re-areation constants

Tidal Effect Dilution--Water surface profile variation among different tidal situations--Water quality correction

DO BOD

Reaeration

BODDO

CO2

RXNsConsumption

O2

Other RXNsConsumption

Sedimentation

Loadings input

Boundary Condition

calculation

Cross Section

Segment 4 Segment 3 Segment 2 Segment 1Completely mixing

0 10 20 30 40 50 60

DO

mg/

L

0

2

4

6

8

10BOD+NH3-N+SOD+TPBOD+NH3-N+SODBOD+NH3-NBODSP eqObserved 00~04 5yr ave.

2003/09/05

Distance from River Mouth(km)0 10 20 30 40 50 60

BO

D m

g/L

0

2

4

6

8

10

12

2003/0903

DO

(mg/

L)

0

2

4

6

8

10

SP SP 2nd SP OI 2003/09/03 observed00~04 DO ave.

Distance from River Mouth (km)

0 10 20 30 40 50 60

BO

D (m

g/L)

0

2

4

6

8

10

12

SP SP 2nd SP OI 2003/09/03 observed00~04 DO ave.

2003/0903

DO

(mg/

L)

0

2

4

6

8

10

SP SP 2nd SP OI 2003/09/03 observed00~04 DO ave.

Distance from River Mouth (km)

0 10 20 30 40 50 60

BO

D (m

g/L)

0

2

4

6

8

10

12

SP SP 2nd SP OI 2003/09/03 observed00~04 DO ave.

The availability of water quality data and hydraulic characteristics are critical as well.