Tài liệu GIS TRONG QUẢN LÝ NƯỚC potx

KHAI NiEM CHUNG QUAN LY NUOC KHU VUC BO THI e Nudc Mat Surface water se Chất lượng nước Water quality e Nước Ngam Ground water... [ Storage on the street or verge and in the ground =

GIS TRONG QUAN LY NUOC

Tầng không thẫm nước

1 KHAI NiEM CHUNG

QUAN LY NUOC KHU VUC BO THI

e Nudc Mat (Surface water)

se Chất lượng nước (Water quality)

e Nước Ngam (Ground water)

e Storage and discharge are “exchangeable” !

© Slow discharge @ small box

e Needed Storage = function of

discharge capacity and

velocity water input

| STORAGE(t)

What do we consider as storage ? Example:

dH =0,4m

2 Storage on the river bank or in an inundation area ? SOA cutace water = 9 Yo

3 [ Storage on the street (or verge) and in the ground = ® A gurface water CaN also realized as inundation area

is deducted in the storage-discharge modell! | e Keep enough hydraulic capacity in the canal

And / or inundation area

more surface water

The water quality

Functions => standards

e Fishing water, swimming water,

Policy “vierde Nota Waterhuishouding”

e Make use of ecological processes

e Deal with pollution sources

e Make selective disconnections

Functions as: demand

© Ecologic diversity Good water quality

1rriga ton water 1 Control sources!

e Fishing water over flows, traffic, building material, air

Ecological purification swim water pollution, pesticides, dogs, etc

2 Stimulate ecological purification

zone Flow / turbulention

Improve water quality

e Has a influence on organization

Stimulate

e Settlement e Of the surface water

e Sun light

NUOC DUOI DAT

3 Ground water control

,a

Can be achieved by:

e Raising the ground level

e Larger freeboard / lowering water a Initial condition a<070ä 100m

e More intensive drainage (drainage,

IT-sewer, canals) b Drainage 6œ >.70 g1.00m

OR less strict standards because of V——t:

e Controlling consolidation +P

s Buildings without crawlspaces C, Lowering polderleval :@>.70 & 1.0mm

e Design of street

e Wet gardens and public green UE

d Raise h+a>0.70 a1.00m.

Xâm nhập nước biển

Tăng mực nước biển > 3mm/năm

SUC CHIU TAI CUA NEN DAT MAT KHU VỰC TP HO CHi MINH

Nén dat phan bé trén mat

Kha nang chiu tai

U11 Vùng có khả năng chiu tai R<0.5 kg/cm2

Vùng có khả năng chịu tải 0.5<=R<1.0 kg/cm2

Vùng có khả năng chịu tải 1.0<=R<1.5 kg/cm2

Vùng có khả năng chịu tải 1.5<=R<2.0 kg/cm2

|& | Vùng có khả năng chịu tải 2.0<=R<3.0 kg/cm2

Trình trạng khơi thác nước ngầm tợi TP HCM:

—e—Dan sé —=— Dién tich không gian đã thị

+ 30000 ễ a he jac tang Pleistocen ¢ giéngkhal thactangPliocentrén 8s + giếng khai thác tầng Fllocen dưới

NT CC El40.00000001 - 50

Võ 21 - 50.00000001 - 70

© ee) @ 70.00000001 - 80 )M@ 2 ø 50.00000001 - 100

QD 123/1998/QD-TT g:

phát triển Đô Thị & khu Công Nghiệp

> GIS TRONG QUAN LY KHAI THÁC NƯỚC NGÂM

¬ 2 ` = E : %6 vn ha ÝY-.£ ‘| ề a Vị trí khai thác nước ngầm

% » pes 5 \ &E eit — = iat eer Pleistocen

> Trinh trang ha thốp mực nước dưới đốt:

(từ năm 199ó đến noy, tốc độ sụt giảm 2-3m/năm)

Vùng tâm phễu hạ thấp mực nước ngầm

Quyết dinh 69/2007/QDB-UBND (3/5/2007) han ché, cam khai

thác nước dưới đất trên địa bàn 30 phường thuộc 13 quận

1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011

Năm

Giếng quan trắc “3C —==3D =—=Q011020 =—#—=Q011040 =—=—=Q011340 Bien bien lún

Tang quan trac Pliocen trên Pliocen dưới Pleistocen Pliocen dưới Pliocen trên

So lieu diéu tra co ban

Hệ thống thông tin hỗ trợ công tác quản lý tài nguyên nước từ thành

phố đến phường/xã; đáp ứng nhu câu triển khai các quy định của nhà

nước và nâng cao năng lực quản lý chuyên môn.

X

e Objectives

- Sustainability What is sustainable development?

¢ Vulnerability ‘Meeting the needs of the present without

¢ Risk managementcompromising the ability of future

¢ Standards generations to meet their own’

‘Maintaining the stock of natural capital’

e Two aspects of approach

¢ Perspective

¢ Judgement

Vulnerability: ‘sensitivity of a system for exposure to shocks,

stresses and disturbances, or the degree to which a system is

susceptible to adverse effects’

e Environmental variation:

¢ Variation of water levels

¢ Variation of water resources

¢ Variation of future climate

Numerous ‘hard’ and ‘soft’ remedies

Threshold Higher dikes Increase river Increase reservoir | More efficient

Capacity Capacity Capacity supply infrastructure

Coping Improve risk Emergency plan & | Backup supply Individual storage

Capacity perception warming facilities

Recovery Disaster fund Insurance Multi source Disaster funds

Adaptive Flood proof & Small scale pilot Flexible portfolio of | Small scale pilot

Capacity flexible urbanization | projects sources projects

Risk management : Basic approach in design is economical

optimization of construction and management based on statistical

standards

¢ Capital charges - Maintenance costs

e Energy costs - Management costs

¢ Costs because of damage - Social-communal cost

- Revenue (negative costs)

e Three points approach (Geldof and Kluck, 2008)

e Input of the system

* Rainfall duration curves

* Runoff coefficients for sewer inflow

e System performance

- Maximum flow velocity of surface water Conflicts

- Groundwater level range

e Output of the system

- Maximum discharge to the surrounding

Standard design storms

e What is a standard storm?

- What is important for design purposes

e How much mm water will fall?

e For how long will it rain?

e How intense is the rain?

e Where will the rain fall?

e How many times can we expect a heavy storm?

¢ Conversion, delay and flatting of inflow

e Discharge via groundwater

e Discharge via main drainage system

Water quality processes

Administrative information Geo-hydrological information

sie Planning zones (es) Terrain elevation

Land register

Utility lines RAC A Rivers

[eee Geodetic survey points [+t at\ Groundwater levels

Subsoil surveys Boreholes

Raster based models

¢ Hierarchy of components in DSS RAISON

GIS

> GIS TRONG QUẢN LÝ KHAI THÁC NƯỚC NGÂM

Temperature,

Land use Terrain Recharge Confining layer

Conductivity, S

Bottom of aquifer

Quận/ Huyện: Quận Bình Thạnh 4 @

PhuGng/ Xa: Phường 21

- Large scale with high resolution (object oriented)

4_- | : III ""

Phân tích biến động Xuất báo cá

* *** Chương trình được thực hiện bởi Trung tâm Địa Tin Học **

T = T