112015.11.252015.11.25

Tun-Chi Yang Assistant Engineer

Tun-Chi Yang Assistant Engineer

2015 APEC Typhoon Symposium

River Dredging and Sediment Management after Typhoon

Morakot

MOEA

Ministry of Economic Affairs

22

outlineoutline

1 、 Problem description

2 、 Solutions

3 、 Achievements

MOEA

MOEA WRA

Sediment disasterSediment disaster Management problems Management problems

4 solutions 4 solutions

4 achievements 4 achievements

MOEA WRA 3

Landslides and collapses in the watershed has caused sediment disasters.

MOEA

3

Sediment disasterSediment disaster921 earthquakeClimate changeTyphoon Morakot

Unsteady soil layer

Unsteady soil layerConcentrated

RainfallConcentrated RainfallLandslide &

collapseLandslide & collapse

Problem descriptionProblem description

Sand pumper ships caused holes everywhere in the river.

4

There is excess sediment that must be dredged .There is excess sediment that must be dredged .

The pollution and traffic problems caused by the trucks from the dredging site.The pollution and traffic problems caused by the trucks from the dredging site.

Problems must be solved ：

Problems must be solved ：

No one is willing to deal with dredging engineering.No one is willing to deal with dredging engineering.

Management problemManagement problem

Incomplete policies

Lack of technology management systems

Pollution and traffic problems

Judicial authorities doubt WRA

Judicial authorities doubt WRA

Protests by local residents

Protests by local residents

Illegal excavating crimes

Illegal excavating crimes

MOEA

MOEA WRA

5

SolutionsSolutions

(2)Improve the dredging (2)Improve the dredging policypolicy

(1)Increase cooperation among government (1)Increase cooperation among government units units

(3)Develop new technology systems(3)Develop new technology systems(3)Develop new technology systems(3)Develop new technology systems

(4)Prevent pollution(4)Prevent pollution(4)Prevent pollution(4)Prevent pollution

(i)Digital Dredging Management System(DDMS) –(point)

(ii)The central remote monitoring system-(line)

(iii)Satellite remote sensing images-(surface)

MOEA WRA

MOEA

6

(1)Increase cooperation among government units (1)Increase cooperation among government units (1)Increase cooperation among government units (1)Increase cooperation among government units

Simplifed the administrative process

basinsrivers

bridges

slop lands

creeks

reservoirs watersheds

Implement the project of dredging for the entire basin

Offer sediment for public engineering

BeforeBefore AfterAfter

Speed up

Speed up

MOEA

(2)Improve the dredging policy(2)Improve the dredging policy(2)Improve the dredging policy(2)Improve the dredging policy

by one contractorby one contractor (early)(early)by one contractorby one contractor (early)(early)

7

1.excavation 2.sale

3.monitoring

MOEA

MOEA WRA

2006

More than three firmsMore than three firms (now)(now)More than three firmsMore than three firms (now)(now)

The quantity of sediment for sale is measurable now.

Active manageme

ntActive

management

weighbridge

8

(3)Develop new technology systems(3)Develop new technology systems(3)Develop new technology systems(3)Develop new technology systems

8

Mobile monitoring station

monitoring station

point-dredging site

managementline-monitoring along the entrance of the

river

surface-monitoring in the river

region

dredging site

Prevent illegal activities

MOEA

satellite remote

closed circuit television,

CCTV

weighbridge

MOEA WRA 9

Dredging site

(i)Digital Dredging Management System(DDMS) –(point)

internet

APP

mobile office

picture 、image、amount

picture 、image、amount

MOEA

Information integration

weighbridge

site

MOEA WRA 10

ExitExit

The excavation amount and

images are recorded

individually.

10

MOEA

EntryEntry

Entry timeEntry time

Exit timeExit time Entry weight Entry weight

Delivery weight(ton)Delivery weight(ton)

Exit weightExit weight

2nd

3rd

4th

5th

6th 7th

8th

9th

1st

10th

River Management Office(1st to 10th)

Dredging statistic display

module

11

The new efficient monitoring system helps reduce the necessary manpower.

Detect

Automatically

internet

Double-checked by a live person

Local security

deliver

respond

Mobile monitoring stationMobile monitoring station

(ii)The central remote monitoring system-(line)

MOEA

MOEA WRA

24 hour video surveillance 24 hour video surveillance

efficient

1212

Date

location

Truck driving in with garbage

The investigation results and photographs were uploaded and integrated into the web-based system.

entry

exitMOEA

MOEA WRA

trigger

Stop illegal quarrying and garbage dumping.

BeforeBefore

(iii)Satellite remote sensing images on monitoring the river –(surface)

River area :

Too vast to patrol

Too remote to locate

River area :

Too vast to patrol

Too remote to locate

Satellite remote sensing images

Satellite remote sensing images

Illegal excavation area is 100 m2, amount is 200 m3

.

13

Field investigation

Field investigation

MOEA

MOEA WRA

A wide range of detection. Regular detection in the change spots (every 2 weeks)

The change spots will be delivered to the security via digital system.

A wide range of detection. Regular detection in the change spots (every 2 weeks)

The change spots will be delivered to the security via digital system.

AfterAfter

Wide range

14

(4)Prevent pollution (4)Prevent pollution (4)Prevent pollution (4)Prevent pollution

Sprinkler

Truck washer

Anti-dust mesh 

MOEA WRA

environmentally-friendly

MOEA

Specially-designed road in the river area

MOEA WRA

(1)The average annual dredging amount is 3.14(1)The average annual dredging amount is 3.14 times greater after Typhoon Morakottimes greater after Typhoon Morakot(1)The average annual dredging amount is 3.14(1)The average annual dredging amount is 3.14 times greater after Typhoon Morakottimes greater after Typhoon Morakot

2009~now (2015) total dredging amount 3.99 hundred million m3

2009~now (2015) total dredging amount 3.99 hundred million m3

(2009)

運載13,000萬方砂石車排列可繞地球4圈

15

AchievementAchievementMOEA

206 times 12 times

16Information is from Bureau Of Mines.

(2)The ratio of the sediment used for construction (2)The ratio of the sediment used for construction to the total supply increased from 44%to the total supply increased from 44% to 60% after to 60% after

Typhoon Morakot.Typhoon Morakot.

(2)The ratio of the sediment used for construction (2)The ratio of the sediment used for construction to the total supply increased from 44%to the total supply increased from 44% to 60% after to 60% after

Typhoon Morakot.Typhoon Morakot.

average=5,887

MOEA

MOEA WRA

Import

Land

sediment

The ratio of sediment

total

(104 m3)

20020099

20120100

20120111

20120122

20120133

20120144

20020088

20020077

20020066

20020055

20020044

(2009)

17

(3)The price of the end product has (3)The price of the end product has stabilized and now fluctuates only 3.5% stabilized and now fluctuates only 3.5% after 2010.after 2010.

(3)The price of the end product has (3)The price of the end product has stabilized and now fluctuates only 3.5% stabilized and now fluctuates only 3.5% after 2010.after 2010.

( 元 )

Raw material is referred to the sediment excavated by WRA dredging engineering.

( 元 /m3)

MOEA

MOEA WRA

Raw material price

The End product price

2010 2011 2012 2013 2014 2015

2004 2005 2006 2007 2008 2009

(NT/m3)

2004~2015 raw material price vs. the end product price

Typhoon MorakotTyphoon Morakot

Stable price

Information of The End product price is from Bureau Of Mines.

18

(4)The profit from selling sediment which (4)The profit from selling sediment which improves rivers and financially helps local improves rivers and financially helps local communities.communities.

(4)The profit from selling sediment which (4)The profit from selling sediment which improves rivers and financially helps local improves rivers and financially helps local communities.communities.

Provide 1.43 billion NT dollars for over 30 small towns.

Emergency flood protection

Donate to students that need money for their lunch

River and drainage improvement

Childbirth Subsidy

River environment improvement

MOEA WRA

Improve rivers

MOEA

Public roads improvement

Public welfare

19

ConclusionMOEA

~Thank you for your attention~~Thank you for your attention~

We had problems of severe sediment disaster, excess sediment that must be dredged, no one is willing to deal with dredging engineering, and the protests by local residents. Nevertheless, we not only cleaned out a lot of sediment for flood protection but also achieved the benefit of economic and public welfare by cooperating with other government units, improving policies, developing new technology systems, and preventing pollution.

We look forward to building a better environment.