WMOD00541

• Title: Adaptation of the Rhea Winter Orographic Precipitation Model to Morocco
• Date: 4/1/1989
• Weather Modification - Doc Type: Report

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TABLE OF CONTENTS

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ABSTRACT ...................................................... i i

LIST OF FIGURES ............................................... v

LIST OF TABLES ................................................ vi

1. INTROOUCTION ANO BACKGROUND .............................. 1

1.1 Introduction ........................................ 1

1.2 Backg round .......................................... 2

2 . MOOEL DESCRIPTION ........................................ 8

2.1 Orographic precipitation Computation ................. 9
2.2 Precipitation Efficiency............................. 11
2.3 Wate r Condensate ..................................... 13
2.4 Vert i ca 1 Motion ...................................... 15

2.5 Blocking............................................. 16
2.6 Model Limitations .................................... 19
2.7 Parameters Requiring Calibration for Optimum Use

of the Model ......................................... 19

3. MODEL ADAPTATION TO MOROCCO ............................... 21

3.1 Problem Description .................................. 21
3.2 Input to the Mode 1 ................................... 23

3.2.1 Upper air data ................................ 23
3.2.2 Topographic data and model domain ............. 32
3.2.3 Other input data .............................. 33

3.3 Mode 1 Output ......................................... 33

3.3.1 Station precipitation ......................... 34
3.3.2 Watershed water volume ........................ 34
3.3.3 Gridded precipitation patterns ................ 34

3.4 Some Parameter Calibrations and Sensitivity Tests .... 35

3.4.1 The streamline vertical displacement .......... 35
3.4.2 The relative humidity thresholds .............. 37

4 . RESULTS AND DISCUSSION .................................... 40

4.1 Comparing Precipitation Stations ..................... 40

4.1.1 Monthly comparisons ........................... 40
4.1.2 Daily comparison .............................. 45