What is it?
The Flood Forecasting Simulation Cascade is a pilot application of the
K-Wf Grid project. It is a set of
several simulation models, which together try to predict possible floods
using meteorlogical simulation, hydrological simulation, and hydraulic
simulation models. The simulations are configured and accessed through
WSRF service interfaces. While the simulation models itslef are proprietary
and have to be obtained from their authors, here you can download all files
necessary to build, configure, deploy, and test the service interfaces
themselves. Even without the simulation model codes, these service interfaces
are valuable source of information, help, and examples regarding development
of WSRF interfaces based on the
Globus Toolkit (GT). The services
use many advanced features of GT, like security (and usage of provided
proxy certificates), data transfers, replica location service, configuration
of services, lifecycle management, and others.
Application Architecture
The PA1-FFSC application is a SOA-based system of WSRF services. The services are organized in 6 layers:
- meteorology
- watershed integration
- hydrology
- hydraulics
- visualization
- presentation
The architecture and these layers are depicted in the figure below.
FFSC Architecture
Meteorology
This layer contains services, which take as input boundary conditions from a third party (the principal data source, Slovak Hydrometeorological Institute SHMI, top of figure), and produce a meteorological simulation for the target area and time of the flood prediction.
Watershed integration
Services in this layer take as input meteorological predictions from the previous layer, and compute predicted watershed for the target river.
Hydrology
Services in the hydrology layer transform the watershed prediction from previous layer into river level prediction, and produce a series of hydrographs for various points of the river in the target area.
Hydraulics
The services in the hydraulics layer perform the final simulation step – they take the predicted river levels and transform them into water flow in the river bed and (in the case of a flood) in the surrounding target area.
Visualization
The simulations computed by above layers are transformed into a user-readable data, mainly images and animations, using a set of visualization services. These services are capable of creating visualizations for predictions of MM5 models, the ALADIN model, and DaveF model. The hydrological models (HSPF and NLC) create visualizations as their standard outputs, so no additional service is needed.
Presentation
The services in this final layer deliver and present the visualized simulation results to the user. This layer consists of several so-called “job packagers” (UJP) which create a browseable HTML structure for the visualization, and the User Proxy Service, which lets the user to discover and browse the structure using a common web-browser.
Components
MM5 preprocessor
This service extracts the target area domain boundary conditions from the initial, much broader boundary conditions for MM5.
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Inputs
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ALADIN boundary conditions (Logical File Name - LFN)
Configuration of target area and time
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Outputs
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MM5 boundary conditions for area (LFN)
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MM5 simple
This service computes the actual weather prediction, using the MM5 model.
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Inputs
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MM5 boundary conditions for target area (LFN)
Configuration of simulation
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Outputs
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MM5 weather prediction (LFN)
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MM5 nested 1-way
This service computes the actual weather prediction, using the MM5 model in a nested configuration, where the inner target area is computed in a loop from the already computed complete area.
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Inputs
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MM5 boundary conditions for target area (LFN)
Configuration of simulation
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Outputs
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MM5 weather prediction (LFN)
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MM5 nested 2-way
This service computes the actual weather prediction, using the MM5 model in a looped configuration.
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Inputs
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MM5 boundary conditions for target area (LFN)
Configuration of simulation
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Outputs
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MM5 weather prediction (LFN)
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ALADIN
This service computes weather prediction for target area using the ALADIN prediction model.
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Inputs
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ALADIN boundary conditions (LFN)
Simulation configuration
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Outputs
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ALADIN weather prediction (LFN)
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MM5 watershed integration
This service computes the amount of water in each watershed subarea of the target area.
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Inputs
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MM5 weather prediction, postprocessed (LFN)
Watershed areas configuration
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Outputs
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Watershed (LFN)
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81-way MM5 watershed integration
This service computes the amount of water in each watershed subarea of the target area, using a statistical approach and generating 81 scenarios for the rest of the simulation cascade.
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Inputs
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MM5 weather prediction, postprocessed (LFN)
Watershed areas configuration
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Outputs
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81 x Watershed (LFNs)
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ALADIN watershed integration
This service computes the amount of water in each watershed subarea of the target area, using ALADIN results.
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Inputs
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ALADIN weather prediction (LFN)
Watershed areas configuration
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Outputs
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Watershed (LFN)
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HSPF
This service computes the hydrograph for the target river (its relevant part) using the HSPF hydrograph construction program.
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Inputs
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Watershed (LFN)
Hydrograph configuration
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Outputs
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Hydrograph (LFN)
Hydrograph visualization (LFN)
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HSPF-complex
This service computes the hydrograph for the target river (its relevant part) using the HSPF hydrograph construction program from 81 watershed predictions.
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Inputs
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81-way watershed (LFN)
Hydrograph configuration
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Outputs
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Hydrograph (LFN)
Hydrograph visualization (LFN)
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NLC
This service computes the hydrograph for the target river (its relevant part) using the NLC model. The results are virtually the same as in the HSPF service’s case, but the model gives different quality of results and delivery times, which may prove useful in the K-WfGrid testing process.
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Inputs
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Watershed (LFN)
Hydrograph configuration
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Outputs
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Hydrograph (LFN)
Hydrograph visualization (LFN)
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DaveF
This service generates a detailed hydraulic simulation of a water flow in a target area.
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Inputs
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Hydrograph (LFN)
Mesh for model configuration (LFN)
Simulation configuration
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Outputs
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Flow vector file (LFN)
Water depth file (LFN)
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ALADIN visualization
This service accepts ALADIN result dataset and creates a set of pictures, showing the weather development described in the input dataset.
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Inputs
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ALADIN weather prediction (LFN)
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Outputs
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Weather prediction maps (LFNs)
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MM5 visualization
This service accepts MM5 result dataset and creates a set of pictures, showing the weather development described in the input dataset.
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Inputs
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MM5 weather prediction (LFN)
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Outputs
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Weather prediction maps (LFNs)
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DaveF 2D visualization (GRASS)
This service converts DaveF output of water depth into a series of images depicting top view of the target area, with visible flooding.
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Inputs
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Water depth file (LFN)
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Outputs
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Target area flooding visualization – series of images (LFNs)
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DaveF 3D visualization (VRML)
This service converts DaveF output of water depth into 3D VRML animation for visual inspection by expert user.
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Inputs
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Water depth file (LFN)
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Outputs
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Target area flooding visualization – VRML 3D animation.
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Waterflow 2D visualization UJP
This service prepares a browseable HTML structure for comfortable viewing of 2D visualization of DaveF simulated water flow.
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Inputs
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2D visualization of DaveF results
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Outputs
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HTML structure archive
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Waterflow 3D visualization UJP
This service prepares a browseable HTML structure for comfortable viewing of 3D visualization of DaveF simulated water flow.
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Inputs
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3D visualization of DaveF results
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Outputs
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HTML structure archive
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Hydrograph UJP
This service service adds a HTML structure to the hydrograph produced by NLC and HSPF services.
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Inputs
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Hydrograph image
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Outputs
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HTML structure archive
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MM5 visualization UJP
This service creates a HTML tree for the visualized results of MM5 meteorological prediction.
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Inputs
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Weather prediction maps
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Outputs
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HTML structure archive
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ALADIN visualization UJP
This service creates a HTML tree for the visualized results of ALADIN meteorological prediction.
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Inputs
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Weather prediction maps
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Outputs
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HTML structure archive
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User Proxy Service
This service notifies user of a new result, and allows him to browse the result; it also allows to submit data using a HTML form (in the result) and to process this data further in the workflow.
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Inputs
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HTML structure archive
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Outputs
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Text/data entered by the user (if any)
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Green (executable) FFSC workflow
