Presentation by Qingtao Liao, Ewaters Shanghai Ltd, China, at the Delft3D - User Days (Day 4: Water quality and ecology), during Delft Software Days - Edition 2019. Thursday, 14 November 2019, Delft.

1. Ewaters
Lake Eutrophication Modelling with Delft3D
Suite, Wuhan City, China
Aaron Liao, Ewaters Environment Science&Technology（Shanghai）Ltd.
With Help from Arjen Markus, Erik de Goede, Deltares
14,Nov,2019
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Presentation Overview
03 Model Evaluation
04
01
Future Plan
Model Building
Introduction
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02

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01
Introduction
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1- Introduction
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7 River Basins in China
Lakes in central urban area
4 Water Systems in Wuhan 40 Lakes in Central Urban Area

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Ⅰ，II or Ⅲ
25,0%
Ⅳ or Ⅴ
58,9%
water quality survey in 2018比
1- Introduction
Parameters (mg/L) Ⅰ Ⅱ Ⅲ Ⅳ Ⅴ
COD 15 15 20 30 40
TP 0.01 0.025 0.05 0.1 0.2
TN 0.20 0.50 1.00 1.50 2.00
NH3-N 0.15 0.50 1.00 1.50 2.00
Better Worse
Worse than Ⅴ
16.1%
5
70%30%
By 2020
I,II or III
Worse than Ⅲ 75%25%
By 2030
I,II or III
Worse than Ⅲ
Environment Quality Standards
of Surface water

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1- Introduction
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• Subcatchments Area:184.6km2
• Lake Area: 47.62 km2
• Water depth: about 2.2m
Characteristic of Tangxun Lake

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1- Introduction
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From 2018， the Water Quality of the Tangxun Lake is Worse than V
By 2025， the Target of Water Quality is ≥ III
Water Quality of Tangxun Lake

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02
Model Building
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2-Model Building——Structure of the Model
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1D Model
1D Hydraulic Model
1D WQ Model
Evaluation
Data collection
Aerial Map
Monitoring Data
Pipe Network Data
Meteorological Data
Data processing
Delft3D FM
Hydrodynamic model
Model Calibration
Hydrodynamic simulation
analysis
Delft3D FM
Water Quality model
Model calibration
Water Quality Simulation
analysis
Quick Plot
Matlab
DEM…
Delft3D FM Suite
2019.04 HMWQ
(1.5.4.45038)
InfoWorks ICM V9.0

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2-Model Building -1D Model Setting
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Type Area
km2
Percentage
%
Roof 53.4 28.9%
Green 68.8 37.3%
Impervious 28.8 15.6%
Bare land 15.8 8.6%
Road 17.7 9.6%
Total 184.6 100%
Underlying Analysis

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2-Model Building—— 1D Model Setting
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12 channels
More than 600 drainage outfalls 151 outfalls in 1D Model
2 pump stations
sewage treatment plant
Model Simplification

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2-Model Building——1D Model Setting
Hydraulic Result
Water Quality Result
Delft3D FM
2D Model1D Model

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3-Model Building——Delft3D FM Model Setting
Mesh generation Model building Boundary conditions
Wind speed
and direction
Rainfall and Evaporation
Discharges
• Meteorological boundaries
• Water flow from 151 outfalls and 2 Plants
• Pollution loads from 151 outfalls and 2 Plants
• Bed level,30m×30m
• Hydraulic structures
• Outlet
• Resolution 80m
• About 17,000 cells
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• Water Quality Monitoring
8 sites at the exit of port canals
6 sites inside the lake
60+ sampling sites at the exit of the outfalls
• Water level Monitoring
6 sites inside the lake
• Rainfall Monitoring
7 sites inside the catchment
• Others
68 Sediment monitoring point
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Water Quality monitoring sites in chanel
Water Quality monitoring sites in Lake
Water level monitoring sites
Rainfall monitoring sites
3-Model Building——Delft3D FM Model Setting

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3-Model Building——Delft3D FM Model Setting
17.6
17.7
17.8
17.9
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18.1
18.2
18.3
18.4
18.5
18.6
18.7
18.8
18.9
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19.1
2018/5/1 2018/6/10 2018/7/20 2018/8/29 2018/10/8 2018/11/17 2018/12/27 2019/2/5 2019/3/17 2019/4/26
WaterLevel（m）
Yulingdao Park
Measured water level
Simulated water level
Yulongndao Park
Verification
17.4
17.6
17.8
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18.2
18.4
18.6
18.8
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19.2
19.4
2018/5/1 2018/6/10 2018/7/20 2018/8/29 2018/10/8 2018/11/17 2018/12/27 2019/2/5 2019/3/17 2019/4/26
WaterLevel（m）
Tangxun Lake village
Measured water level
Simulated water level
Tangxun Lake village

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03
Model Evaluation
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3 Model Evaluation——Case1 Current Situation Evaluation
Flood season 2018.06.29~2018.07.04 Non flood season 2019.03.06~2019.03.11
Hydraulic model
0.01m/s 510-3m/s
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3 Model Evaluation——Case1 Current Situation Evaluation
Non-flood
season
20180310 12:00
Flood season
20180701 12:00
COD TP NH3-N TN
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CSO control& Sponge city project
Water treatment system improvingRiver connecting project
3-Evaluation——Case2 Evaluation of the Water Environment Master Plan
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Water Environment
MasterPlan of Tangxun Lake
Basin
Water diversion project
Water with better quality

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3-Evaluation- Case2 Evaluation of the Water Environment Master Plan
Non-flood season Flood season
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Before improvement
After improvement

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3-Evaluation -Case2 Evaluation of the Water Environment Master Plan
AfterBefore
AfterBefore
Non-flood season
Flood season
COD
AfterBefore
AfterBefore
Non-flood season
Flood season
TP
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COD TP

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3-Evaluation -Case2 Evaluation of the Water Environment Master Plan
NH3-N
AfterBefore
AfterBefore
Non-flood season
Flood season
AfterBefore
AfterBefore
Non-flood season
Flood season
TN
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NH3-N TN

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3-Evaluation—— Case3 Water Quality Forecasting
◆ Simulated Time : 2019.09.01~2019.11.30
◆ Boundary conditions:
Section Boundary data
Existing
2019.09.01~2019.09.30
monitoring data
Forcasting
2019.10.01~2019.11.30
Based on two typical year
• 2012——more rainfall
• 2018——less rainfall
0
10
20
30
40
50
60
2019/9/1 2019/9/11 2019/9/21 2019/10/1 2019/10/11 2019/10/21 2019/10/31 2019/11/10 2019/11/20 2019/11/30
降雨（mm）
2012 rainfall
0
5
10
15
20
25
30
2019/9/1 2019/9/11 2019/9/21 2019/10/1 2019/10/11 2019/10/21 2019/10/31 2019/11/10 2019/11/20 2019/11/30
降雨（mm）
2018 rainfall
◆ Diversion works
Diversion works was stopped since 2019.09.13
◆ Pollutant reduction
One sewage treatment plant was stopped since 2019.09.13
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3-Evaluation——Case3 Water Quality Forecasting
Based on 2012 Based on 2018
TN simulation results
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3-Evaluation——Case3 Water Quality Forecasting
Based on 2012 Based on 2018
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TP simulation results

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04
Future Plan
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4 Future Plan
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1D Model Delft3D FM model
Delft-FEWS
• Data processing
resultsData
Medel Evaluation
Display：data and
simulation results
Data quality assessment
Ensemble Forecasting
Completed
To be completed
Data
collection
Aerial Map
Monitoring Data
Pipe Network Data
Meteorological Data
DEM…

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4- Future Plan
• Channels & Structures
22 (bridge and culverts, dikes, weirs)
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2
10-1
11
7
2
10-1
7
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THANK YOU!
Aaron Liao
Qingtao.liao@ewaters.biz
www.ewaters.bizKnow more about us at
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