SOBEK in Jakarta FEWS

Sobek in this course

Today (with Daniel Tollenaar):

1. The role of SOBEK in “Jakarta FEWS”

2. What does SOBEK RR do (as in Jakarta)?

3. What does the SOBEK 1D-2D do (as in Jakarta)?

Next Monday (with Eelco Verschelling):

The development of the Jakarta Sobek model

- How is it build?

- Where is it build for?

- What can (and can’t) you do with it?

Objective: not to build a Sobek model yourself, but to understand what is happening when you turn on the “run Sobek workflow” in FEWS

“Modules” of Jakarta FEWS

P source (ACCESSA)

FEWS P transformation

SOBEK(RR - 1D - 2D)

SOBEK1D / 2D integrated modelling environment for integral solutions

About SOBEK

River

Urban

Rural

About SOBEK

• State-of-the-art modelling framework for:

• river and estuarine systems,

• drainage and irrigation systems and

• wastewater and storm water systems• Including hydrodynamics, hydrology, morphology, water quality• Established in the nineties• Over 80 members of staff• Software development, sales, support, training• Part of Deltares• Active in 70 countries worldwide• Agents in Australia, Brazil, China, Indonesia, Germany

About a Sobek RR-1D-2D model (as for Jakarta)

SOBEK-RR

SOBEK 1D SOBEK 2D

Start

End

SobekRR - 1D -2D

Hydrology (rainfall-runoff)

Hydro-dynamics

Sobek RR (in general)

SOBEK-RR

SOBEK 1D SOBEK 2D

Start

End

SobekRR - 1D -2D Many concepts available within Sobek:

- For river schematizations:

Sacramento, HBV, SCS

- For urban schematizations (sewers):

NWRW “inloop” model

- For rural schematizations (polders):

“Unpaved”, “Paved” and …. models

Note: also routing (Muskingum) can be applied within Sobek-RR!

Sobek RR (in Jakarta)

Figure: the Sacramento concept

Lumped conceptual hydrological

model.

Some parameters can be directly

linked to physics (Ogink). Others

have to be optained by

calibration

In some catchments, a runoff delay is applied using the Muskingum method

Sobek RR (in Jakarta)

Rainfall-Runoff in FEWS

P source (ACCESSA)

FEWS P transformation

SOBEK(RR - 1D - 2D)

P source (ACCESSA)

FEWSP transformation

SOBEK(1D-2D)

Rainfall-Runoff model

Rainfall-Runoff in Sobek Seperate rainfall-runoff concept

What if you want to apply your own rainfall-runoff model and still use the

hydro-dynamics of SOBEK (or of another model)?

Thats where FEWS can help you!

Sobek 1D

grid nodes

cross sections

reach segments

Basic components of a 1D model

Cross sections define the

geometry of your river/canal

Sobek calculates for each time

step:

- water levels at grid nodes

- discharges/velocities at reach segements

Sobek 1D-2D

1D-2D is a 1 dimensional network combined with a 2 demensional grid

1D network and 2D network

communicate via 1D grid nodes

and underlying 2D cells

Example 1:Katrina New Orleans, USA

New OrleansKatrina 2005

Example 2: Polder inundation from boezem

Polder inundation @ ……

Example 3: Serious gaming (1953 floods)

Example 4: Inundation plantation schemes Musi

Discussion: some questions

- When do we need a 1D and when a 2D model?

- What do we require for building a good 1D-2D model?

- What do we require for simulating with a RR-1D-2D model?

- How do you communicate model results?

- ……