Watershed sediment yield modeling for data scarce areas [Elektronische Ressource] / von Habtamu Itefa Geleta
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Watershed sediment yield modeling for data scarce areas [Elektronische Ressource] / von Habtamu Itefa Geleta

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Watershed Sediment Yield Modeling for Data Scarce Areas V de Fak l Ba dUm eli ge ie i e chafe deU i e i S ga E la g gde W deei eD k I ge ie D I g ge ehmige Abha dl gV gelegHabtamu Itefa Geleta a Ai a W llega hi ieHa be iche P f D I g SilkeWie ech Mibe iche P f D AchimA Be lichPDD I g Wale MaTagde m dliche P f g De embeI i f Wa e ba de U i e i S gaHef Wae edSedime Yielddeli gf DaaSca ce aD I gHabam IefaGeleaEige e lagde I i f Wa e ba de U i e i S gaD93 Watershed Sediment Yield Modeling for Data Scarce Areas Bibliografische Information der Deutschen NationalbibliothekDieDe cheNa i albibli hek e eich e die e P blikai i de De cheNa i albibli g afie deaillie e bibli g afi cheDae i dimI e e beh d b deab fbaGelea Habam IefaWae hedSedime YieldM deli gf DaaSca ceA eaHab am IefaGelea I i fWa e ba U i e i S ga S ga I f Wa e baMi eil ge I i f Wa e ba U i e i S ga HZ gl S ga U i DiISBNNE I i f Wa e ba Mi eil geGege Ve ielf lig g d be e gbe ehe kei eEi de e i dlediglichmQ elle a gabegebeeHe a gegebe mEige e lagde I i f Wa e baD ck D c me Ce e S K l O fildeACKNOWLEDGMENT I am grateful to my supervisors Prof. Dr.-Ing. Silke Wieprecht and PD Dr.-Ing. Walter Marx for the devotion of their precious time to supervise my PhD work.

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Published 01 January 2011
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Watershed Sediment Yield Modeling for Data Scarce Areas









V de Fak l Ba dUm eli ge ie i e chafe de
U i e i S ga E la g gde W deei e
D k I ge ie D I g ge ehmige Abha dl g
V geleg
Habtamu Itefa Geleta
a Ai a W llega hi ie
Ha be iche P f D I g SilkeWie ech
Mibe iche P f D AchimA Be lich
PDD I g Wale Ma
Tagde m dliche P f g De embe
I i f Wa e ba de U i e i S gaHef Wae edSedime Yield
deli gf DaaSca ce a
D I g
Habam IefaGelea
Eige e lagde I i f Wa e ba de U i e i S gaD93 Watershed Sediment Yield Modeling for Data Scarce Areas
Bibliografische Information der Deutschen Nationalbibliothek
DieDe cheNa i albibli hek e eich e die e P blikai i de De che
Na i albibli g afie deaillie e bibli g afi cheDae i dimI e e be
h d b deab fba
Gelea Habam Iefa
Wae hedSedime YieldM deli gf DaaSca ceA ea
Hab am IefaGelea I i f
Wa e ba U i e i S ga S ga I f Wa e ba
Mi eil ge I i f Wa e ba U i e i S ga H
Z gl S ga U i Di
ISBN
NE I i f Wa e ba <S ga > Mi eil ge
Gege Ve ielf lig g d be e gbe ehe kei eEi de e i dlediglich
mQ elle a gabegebee
He a gegebe mEige e lagde I i f Wa e ba
D ck D c me Ce e S K l O fildeACKNOWLEDGMENT

I am grateful to my supervisors Prof. Dr.-Ing. Silke Wieprecht and PD Dr.-Ing. Walter Marx
for the devotion of their precious time to supervise my PhD work. My supervisors’ guidance
and comments on the research findings were invaluable. I would like to thank the ENWAT
doctoral program for their kind cooperation in providing the required information and
guidance, which enabled me to pass through the official steps during the admission and
qualifying examination periods. Specifically, my heartfelt appreciation goes to the ENWAT
program course director, Dr.-Ing. Gabriele Hartmann for her genuine help regarding the
settlement of financial matters by negotiating with the BMBF/IPSWAT scholarship program. I
am also grateful to Prof. Dr. Achim A. Beylich from Geological Survey of Norway for his
valuable suggestions and comments both during and after my qualifying examination.
I would like to thank the BMBF/IPSWAT scholarship program for providing me with financial
assistance during my stay in Germany and for covering transport costs and miscellaneous
expenses during my stay in Ethiopia for field data collection. I am grateful to the Ethiopian
authorities, specifically the Ministry of Water Resources and the National Meteorology Service
Agency for their willingness to provide me with the requested data elements and laboratory
facilities. I am thankful to all my friends whose encouragement has been invaluable during
my research work, especially Dr.-Ing. Kassa Tadale for his suggestions and comments on
setting up the SWAT2005 model. I would like to thank my families, my wife Kidist Teshome,
my beloved sons: Geleta and Robson and all relatives and friends for encouraging and
supporting me through every difficult stage of my research. I am grateful to Ms. Eva Fenrich
and Mr. Tobias Gebler for their assistance in translating the summary part of the thesis to
German version.
Above all and everything, I thank Almighty God the Father, God the Son and God the Holy
Spirit, whose love, grace and unity has been with me throughout my life and helped me to
achieve my dreams.



Habtamu Itefa Geleta
Contents Pages
LIST OF FIGURES .......................................................................................... iv
LIST OF TABLES ............................................................................................ vi
ABBREVIATIONS AND ACRONYMS............................................................... vii
ABSTRACT .................................................................................................... viii
ZUSAMMENFASSUNG ..................................................................................... x
1. INTRODUCTION ......................................................................................... 1
1.1 Background and justification ...................................................................1
1.2 Research goals and methodology ............................................................4
1.3 Hypothesis of the research work..............................................................5
2. SOIL ERODIBILITY ESTIMATION METHODS ............................................. 6
2.1 Introduction ..........................................................................................6
2.2 Review of existing methods for soil erodibility estimation...........................7
2.3 Applicability and comparative assessment of the erodibility estimation
methods ...........................................................................................10
2.4 Discussion ...........................................................................................13
3. DESCRIPTION OF THE STUDY AREA ........................................................ 16
3.1 Climatic zone classification....................................................................16
3.1.1 Upper Awash basin ..................................................................................... 18
3.1.2 Blue Nile basin............................................................................................ 18
3.1.2.1 Gudar subbasin..................................................................................19
3.1.2.2 Fincha subbasin.................................................................................19
3.2 Data availability ...................................................................................19
3.2.1 Primary data collection ................................................................................ 19
3.2.2 Secondary data collection ............................................................................ 22
4. ALTERNATIVE APPROACH FOR SOIL ERODIBILITY ESTIMATION........ 23
4.1 Background and data availability ...........................................................23
4.2 Application of FAO soil map to the study area.........................................25
4.3 An alternative soil erodibility estimation approach ...................................29
4.4 Evaluation of the alternative soil erodibility estimation method.................31
4.4.1 Evaluation of the ERFAC equation using Upper Awash basin soil data................ 31
4.4.2 Evaluation of the ERFAC equation using FAO world soil data............................ 34
4.5 Discussion ...........................................................................................37
5. APPLICATION OF SWAT2005 MODEL....................................................... 40
5.1 Review of watershed models.................................................................40
i