Short introduction tothe use of PEARL

General propertiesFirst tier assessments

Higher tier assessments

Before looking at first and higher tier assessments, we will show you some general properties of PEARL.

Use the mouse to proceed to the next slideUse the Back button of your browser to stop

PearlUser

Interface

PearlUser

Interface

Pearlmodel

Pearlmodel

XYWinXYWin

Pearldatabase

Pearldatabase

ReportReportGraphGraph

The PEARL system consists of various components as shown in the figure. As a user, you will communicate with the PEARL User Interface only.

When you start the user interface, you will always enter the main screen. From here, you can access the data, run the model and view the results.

Pearl uses a relational database for data storage. Runs are composed of building blocks at various levels.

Scenario

Location Cropcalendar

Irrigationschedule

Soilprofile

Meteostation

Localground-water

system

Regionalground-water

system

Crop Irrigationevent

Soilhorizon

Cropstage

Weatherrecord

Drainagelevel

Substance

Transformationschedule

Depositionscheme

Annualapplicationschedule

General Freundlichsorption

Trans-for-

mation

Depositionrecord

Applicationevent

Diffu-sion

Cropinter-action

Run

Project

Simulationcontrol

Long-termapplicationschedule

The highest level in the database hierarchy is the project level, which allows you to organize the data.

The on-line help function is an important feature of the system. The manual contains guidelines on model-use, derivation of model parameters and background information.

PEARL has a build in viewer. All PEARL graphs can be saved as Enhanced Windows Metafiles, which can be imported in (for example) Word 97

Tier I assessments

FOCUS

Let’s now have a look at the FOCUS scenario’s. In the following section, we will show you the most important steps.

Step 1Add and edit a substance

Before you can start using the FOCUS scenario’s, you have to add or edit a substance.

Push to add substance

Put in data

Additional input sheets

Close when finished

Add a substance

Step 2Add and edit an application

schedule

As a second step, you will have to edit or add an application schedule.

Push to add / edit application

Specify applications and details within scheme

Choose or add a scheme

Step 3Generate runs with the

Focus wizard

Now the database contains all the required information. You can now generate Focus runs by combining crops, locations, a substance and an application scheme.

Push to generate runs

Select one or more crops

Select one or more locations

Select substance, application schedule and repeat interval

PEARL will now create a new project, containing all possible combinations (= runs).

These runs are automatically selected for execution.

Step 4Refinement

You may want to edit the individual runs before actually running the model.

You are free to assign different application schedules to individual runs.

Step 5Run the model

You can execute several model runs with one push on a button.

Push to execute selected runs

The User Interface will createthe input files and run the model.

You can follow the course of the simulations

Step 6View model results

PEARL has predefined graphs and reports, specially dedicated to the first tier of the registration procedure.

View reports and graphs

Look at the FOCUS summary graph.

* ------------------------------------------------------------------------------* ###### ###* ## ## ##* ## ## ##### ##### ## ### ##* ##### ## # # ### ## ##* ## ####### ###### ## ## PearlModelv1.1-sr3* ## ## # ## ## ## 15-Aug-2000* #### ##### #### ## #### #### (c) RIVM/Alterra* Pesticide Emission Assessment for Regional and Local scales* ------------------------------------------------------------------------------** Pearl run at 01-09-2000 on 15:00** Output generated for FOCUS* Location: CHATEAUDUN* Meteo station CHAT-M* Soil type CHAT-S_Soil* Crop calendar CHAT-APPLES* Substance A* Application scheme FOCUS_AUTUMN* Irrigation scheme CHAT-IRR-D* ------------------------------------------------------------------------------* Intermediate Focus output for compound A* Molar mass (g.mol-1) : 300.0* Saturated vapour pressure (Pa) : 0.1E-09; measured at (C) 20.0* Solubility in water (mg.L-1) : 0.9E+02; measured at (C) 20.0* Half-life (d) : 60.0; measured at (C) 20.0* Kom (coef. for sorption on organic matter) (L.kg-1) : 60.0* Freundlich exponent (-) : 0.90 ----------------------------------------------------------------------------------------------------------------------------------* yr Identifier AmaLea FlvLea ConLea* (kg/ha) (m) (ug/L)1907 Focus_A 0.22412E-01 0.54834 4.08731908 Focus_A 0.18553E-01 0.42809 4.33401909 Focus_A 0.20426E-01 0.47251 4.32291910 Focus_A 0.27916E-01 0.45838 6.09021911 Focus_A 0.44740E-01 0.60899 7.34651912 Focus_A 0.42548E-01 0.49126 8.66101913 Focus_A 0.40576E-01 0.53318 7.61021914 Focus_A 0.37285E-01 0.57541 6.47971915 Focus_A 0.24883E-01 0.42412 5.86701916 Focus_A 0.36525E-01 0.63208 5.77851917 Focus_A 0.29609E-01 0.44949 6.58731918 Focus_A 0.33672E-01 0.46148 7.29651919 Focus_A 0.26952E-01 0.45935 5.86741920 Focus_A 0.32178E-01 0.51934 6.19601921 Focus_A 0.25109E-01 0.38972 6.44271922 Focus_A 0.12728E-01 0.34364 3.70391923 Focus_A 0.10624E-01 0.38825 2.73641924 Focus_A 0.13643E-01 0.42882 3.18151925 Focus_A 0.14069E-01 0.39062 3.60161926 Focus_A 0.20659E-01 0.44992 4.5917

* The average concentration of A closest to the 80th percentile is 7.297 ug/L* This value occurs in period from 01-Jan-1918 to 31-Dec-1918

* End of PEARL report

Part of summary output

FOCUS target output

Higher tier assessments

In higher tier assessments, you will have to add site-specific data. You can make adaptations to existing data, or start from scratch.

Change scenario properties

Import weather data

Add or change soil profile

Add or change soil building blocks, put in characteristic values

Select lower boundary condition and, if necessary, put in data

In the case of higher tier assessments, you may want to have a look at more specific model outputs

You have seen some features and applications of the PEARL model

Download the model, register and try it.

Don’t forget to use theon-line manual!

Use the Back button of your web browser to stop the show