Pan-tropical Runoff for the World Water Development Report II
Entry ID: UNH_WWRDII_PANTROPIC

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Summary
Abstract: Gridded fields of changes in runoff and river flow (discharge) due to
historical and hypothetical deforestation from Douglas et
al. (2005). Scenario 1 (Sc1, historical) compared distributed runoff
(RO) and river flow (discharge, Q) generated from pre-industrial land
cover (based on WWF Terrestrial Ecoregions of the World (Olson et al.,
2001) with runoff and river flow derived from contemporary
landcover. Scenario 2 (Sc2, hypothetical future) compared distributed
runoff and river flow (discharge, Q) generated from the contemporary
landcover with runoff and river flow generated from a hypothetical
future forest conversion scenario.

The contemporary landcover was developed by combining the Global Land
Cover Characteristics Database (GLCCD 2000; Loveland et al. 2000)
interpreted using the International Geosphere-Biosphere Programme
(IGBP) land cover classification scheme (IGBP 1998) with cropland and
cropland mosaic classes from the IFPRI Agricultural Extent database,
which is a reinterpretation of the GLCCD v2.0 dataset. This exercise
identified areas, at a 1km resolution, that contain 30 percent or more
agricultural activity. For details on the creation of the IFPRI
Agricultural Extent, see Wood et al. (2000) and IFPRI (2002). The
Center for Sustainability and the Global Environment at the University
of Wisconsin has developed a global pasture surface based also on a
reinterpretation of the GLCCD v2.0 data. The pasture surface
represents non-forest areas that are used for grazing (Ramankutty
2003). The agricultural extent and pasture surfaces were superimposed
on the IGBP classified GLCCD to create the contemporary land cover
surface.

The objective Scenario 2 (hypothetical future forest conversion), was
to design a hypothetical, "worst case" land cover change experiment
that explored deforestation in the most vulnerable tracts of remaining
forest, and to measure what effect this conversion could potentially
have on biodiversity, hydrological function and ultimately, on
downstream human populations. The baseline for this scenario was the
contemporary land cover surface because the contemporary land cover
surface was our best available representation of existing land
cover. In Scenario 2, only existing forest area (circa 1992/3) within
the tropical forest biomes was targeted for conversion; land cover in
all remaining portions of the domain was held constant. The global
conservation status from the WWF terrestrial ecoregions database
(Olson et al., 2001) was used to identify the areas most vulnerable to
change within the tropical forest biomes; forest conversion was
limited to areas. The conservation status is an indicator of the
degree and threat of change for each individual ecosystem. The key
factors defining the conservation status are the degree of habitat
loss, the level of fragmentation, remaining block size and level of
conversion. The areas classified as critical or endangered were
designated as those most threatened in terms of potential
deforestation. Areas currently under protection, as identified by The
World Conservation Monitoring Centre's (UNEP-WCMC, 2003) protected
areas database, were therefore not subject to conversion.

The sceanrios are defined as:

Scenario 1: Change in runoff (del RO, in mm/yr) due to historical
forest conversion to agriculture: Douglas et al. (2005)

Scenario 1: Change in discharge (del Q, in km3/yr) due to historical
forest conversion to agriculture: Douglas et al. (2005)

Scenario 1: Relative change in discharge (ratio of del Q to Q) due to
historical forest conversion to agriculture: Douglas et al. (2005)

Scenario 2: Change in runoff (del RO, in mm/yr) due to hypothetical
future forest conversion to agriculture: Douglas et al. (2005)

Scenario 2: Change in discharge (del Q, in km3/yr) due to hypothetical
future forest conversion to agriculture: Douglas et al. (2005)

Scenario 2: Relative change in discharge (ratio of del Q to Q)
due to hypothetical future forest conversion to agriculture: Douglas
et al. (2005)

Related URL
Link: GET DATA
Description: Access to water pollution indicators data


Link: VIEW RELATED INFORMATION
Description: Access to documentation


Geographic Coverage
 N: 20.0 S: -30.0  E: 180.0  W: -180.0

Data Set Citation
Dataset Originator/Creator: Water Systems Analysis Group
Dataset Title: Water Pan-tropical Runoff and Human Vulnerability
Dataset Series Name: World Water Development Report II
Dataset Release Place: Durham, NH
Dataset Publisher: University of New Hampshire
Online Resource: http://wwdrii.sr.unh.edu/download.html


Location Keywords
CONTINENT > ASIA > SOUTHCENTRAL ASIA > INDIA
OCEAN > INDIAN OCEAN > INDONESIA
OCEAN > INDIAN OCEAN > MADAGASCAR
CONTINENT > SOUTH AMERICA > BOLIVIA
CONTINENT > SOUTH AMERICA > BRAZIL
CONTINENT > SOUTH AMERICA > COLOMBIA
CONTINENT > SOUTH AMERICA > ECUADOR
CONTINENT > SOUTH AMERICA > PARAGUAY
CONTINENT > SOUTH AMERICA > PERU
CONTINENT > SOUTH AMERICA > VENEZUELA
CONTINENT > AFRICA > CENTRAL AFRICA
CONTINENT > AFRICA > EASTERN AFRICA
CONTINENT > AFRICA > WESTERN AFRICA
CONTINENT > ASIA > SOUTHEASTERN ASIA
CONTINENT > NORTH AMERICA > CENTRAL AMERICA
GEOGRAPHIC REGION > TROPICS


Science Keywords
BIOSPHERE >TERRESTRIAL ECOSYSTEMS >AGRICULTURAL LANDS    [Definition]
HUMAN DIMENSIONS >HABITAT CONVERSION/FRAGMENTATION >RECLAMATION/REVEGETATION/RESTORATION    [Definition]
HUMAN DIMENSIONS >ENVIRONMENTAL GOVERNANCE/MANAGEMENT >WATER MANAGEMENT    [Definition]
HUMAN DIMENSIONS >ENVIRONMENTAL GOVERNANCE/MANAGEMENT >LAND MANAGEMENT    [Definition]
TERRESTRIAL HYDROSPHERE >SURFACE WATER >RUNOFF    [Definition]
LAND SURFACE >LAND USE/LAND COVER >LAND COVER    [Definition]
HUMAN DIMENSIONS >SOCIAL BEHAVIOR >VULNERABILITY LEVELS/INDEX    [Definition]


ISO Topic Category
FARMING
IMAGERY/BASE MAPS/EARTH COVER


Project
WWAP >World Water Assessment Programme    [Information]


Keywords
forest conversion to agriculture
change in runoff
World Water Asessment Programme
World Water Development Report II


Data Set Progress
COMPLETE


Originating Center
UNH


Data Center
Water Systems Analysis Group, Complex Systems Research Center, Institute for the Study of Earth, Oceans, and Space, University of New Hampshire    [Information]
Data Center URL: http://www.wsag.unh.edu/

Data Center Personnel
Name: CHARLES J. VOROSMARTY
Phone: (603) 862-1792
Fax: (603) 862-0188
Email: charles.vorosmarty at unh.edu
Contact Address:
Water Systems Analysis Group
Complex Systems Research Center
Institute for the Study of Earth, Oceans, and Space
University of New Hampshire
Morse Hall, 39 College Road
City: DURHAM
Province or State: NH
Postal Code: 03824
Country: USA



Distribution
Distribution_Media: online
Distribution_Format: JPEG, ascii, ARC
Fees: none


Personnel
CHARLES J. VOROSMARTY
Role: INVESTIGATOR
Phone: (603) 862-1792
Fax: (603) 862-0188
Email: charles.vorosmarty at unh.edu
Contact Address:
Water Systems Analysis Group
Complex Systems Research Center
Institute for the Study of Earth, Oceans, and Space
University of New Hampshire
Morse Hall, 39 College Road
City: DURHAM
Province or State: NH
Postal Code: 03824
Country: USA


Publications/References
Douglas, E. M., K. Sebastian, C. J. Vorosmarty and S. Wood, 2005. The
role of tropical forests in supporting biodiversity and hydrologic
integrity, Ecological Applications, in review.

Global Land Cover Characteristics Database (GLCCD). Version
2.0. 2001. Available online at:
http://edcdaac.usgs.gov/glcc/glcc.html.

International Food Policy Research Institute (IFPRI). 2002. Global
Agricultural Extent v2.0. Available online at:
http://www.asb.cgiar.org/

International Geosphere Biosphere Programme (IGBP). 1998. Data and
Information Systems, IGBP-DIS Global Land Cover Set DISCover.

Olson, D.M., E. Dinerstein, E.D. Wikramanayake, N.D. Burgess,
G.V.N. Powell, E.C. Underwood, J.A., D'Amico, I.Itoua, H.E. Strand,
J.C. Morrison, C.J. Loucks, T.F. Allnutt, T.H. Ricketts, Y.Kura,
J.F. Lamoreux, W.W. Wettengel, P.Hedao, and
K.R. Kassem. 2001. "Terrestrial Ecoregions of the World: A New Map of
Life on Earth", in BioScience. 51(11): 935-938.

Ramankutty, N. 2003. Global Grazing Lands Dataset. Center for
Sustainability and the Global Environment (SAGE). University of
Wisconsin, Madison. Data made available through personal
communication.

UNEP-WCMC. 2003. Prototypes of National and International Designated
Protected Areas. Description available at
http://www.unep-wcmc.org/protected_areas/. Data made available through
the Millennium Ecosystem Assessment Intranet (2003).

Wood, S, K. Sebastian and S.J. Scherr. 2000. "Pilot Analysis of Global
Ecosystems: Agroecosystems". World Resources Institute/International
Food Policy Research Institute. Washington D.C.

Creation and Review Dates
DIF Creation Date: 2005-12-12
Last DIF Revision Date: 2012-11-02

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