Browsing by Author "Wolski, P."
Now showing items 1-20 of 20
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Aquatic ecosystem responses to fire and flood size in the Okavango Delta: observations from the seasonal floodplains
Ramberg, L.; Lindholm, M.; Hessen, D.O.; Murray-Hudson, M.; Bonyongo, C.; Heinl, M.; Masamba, W.; Vanderpost, C.; Wolski, P. (Springer, http://www.springer.com, 2010-07-19)The frequency of fires in the Okavango Delta seasonal floodplains peaked at an intermediate frequency of flooding. Floodplains are commonly burnt every 3–5 years. This study showed fundamental changes in ecosystem properties ... -
Aspects of seasonal dynamics of flooding in the Okavango delta
Wolski, P.; Masaka, T.; Raditsebe, L.; Murry-Hudson, M. (Botswana Society, 2005)Seasonal changes in inundation area and peak flood occurrence in the Okavango Delta are analysed using a multiple regression technique. The multiple regression models developed constitute useful and simple tools for ... -
Characterization of arsenic occurrence in the water and sediments of the Okavango Delta, NW Botswana
Huntsman-Mapila, P.; Mapila, T.; Letshwenyo, M.; Wolski, P.; Hemond, C. (Elsevier Science B.V. Amsterdam; http://www.elsevier.com/wps/find/journaldescription.cws_home/768/description#description, 2006)Detailed chemical analyses were performed on surface water, groundwater and sediment samples collected from the Okavango Delta between February and November 2003 in order to examine the distribution and geochemistry ... -
Effects of annual flooding on dissolved organic carbon dynamics within a pristine wetland, the Okavango Delta, Botswana
Mladenov, N.; McKnight, D.M.; Wolski, P.; Ramberg, L. (The Society of Wetland Scientists, 2005)In the Okavango Delta in Botswana, dissolved organic matter (DOM) transport is controlled by the slow movement of an annual flood ‘pulse’ across permanently and seasonally flooded wetlands, known respectively as the ... -
Flooding dynamics in a large low-gradient alluvial fan, the Okavango delta, Botswana, from analysis and interpretation of 30-year hydrometric record
Wolski, P.; Murray-Hudson, M. (Hydrology and Earth Systems Sciences, www.hydrology-and-earth-system-sciences.net, 2006)The Okavango Delta is a flood-pulsed wetland, which supports a large tourism industry and the subsistence of the local population through the provision of ecosystem services. In order to obtain insight into the influence ... -
Forecasting the spatial extent of the annual flood in the Okavango delta, Botswana
Gumbricht, T.; Wolski, P.; Frost, P.; McCarthy, T.S. (Elsevier http://www.doi:10.1016/j.jhydrol.2003.11.010, 2004)The pristine Okavango Delta wetland of northern Botswana is potentially under threat due to water abstraction from its tributaries. We have developed a statistical model which makes it possible to predict the extent of ... -
Forecasting the spatial extent of the annual flood in the Okavango delta, Botswana
Gumbricht, T.; Wolski, P.; Frost, P.; McCarthy, T.S. (Elservier, www.elsevier.com, 2004)The pristine Okavango Delta wetland of northern Botswana is potentially under threat due to water abstraction from its tributaries. We have developed a statistical model which makes it possible to predict the extent of ... -
Global monitoring of wetlands - the value of ENVISAT ASAR Global mode
Bartsch, A.; Wagner, W.; Scipal, K.; Sabel, D.; Wolski, P. (Elsevier, 2008-03-17)This paper elaborates on recent advances in the use of ScanSAR technologies for wetland-related research. Applications of active satellite radar systems include the monitoring of inundation dynamics as well as time series ... -
Incorporating uncertainty into adaptive, transboundary water challenges: a conceptual design for the Okavango River Basin
Kiker, G.; Munoz-Carpena, R.; Wolski, P.; Cathey, A.; Gaughan, A.; Kim, J. (Inderscience, http://www.inderscience.com, 2008)In this paper, we present a review and conceptual design to integrate hydrological/ecological models, global uncertainty and sensitivity analysis, integrative modelling and decision analysis for complex and adaptive ... -
Indicators of desiccation-driven change in the distal Okavango Delta, Botswana
Ringrose, S.; Vanderpost, C.; Matheson, W.; Wolski, P.; Huntsman-Mapila, P.; Murray-Hudson, M.; Jellema, A. (Elsevier Ltd; www.elsevier.com/locate/jaridenv, 2007-01)This work seeks to determine whether riparian woody plant variables respond to drying and salinity regimes in the semi-arid distal Okavango Delta, northern Botswana. Structural and compositional variables were obtained ... -
Islands in the Okavango delta as sinks of water-borne nutrients
Wolski, P.; Murry-Hudson, M.; Fernkvist, P.; Liden, A.; Huntsman-Mapila, P.; Ramberg, L. (Botswana Society, 2005)Groundwater under islands in the Okavango Delta is a known sink of inorganic dissolved minerals, preventing salinisation of this virtually enclosed evaporation-dominated hydrological system. The Okavango Delta is an ... -
Remote sensing-derived hydroperiod as a predictor of floodplain vegetation composition
Murray-Hudson, M.; Wolski, P.; Cassidy, L.; Brown, M.T.; Thito, K.; Kashe, K.; Mosimanyana, E. (Springer Link; https://link.springer.com, 2014-02-13)Characterising hydroperiod and vegetation for flood-pulsed wetlands is a critical first step towards understanding their ecology. In large, data-poor wetlands such as Botswana’s Okavango Delta, quantifying hydrology and ... -
Scenarios of the impact of local and upstream changes in climate and water use on hydro-ecology in the Okavango Delta, Botswana
Murray-Hudson, M.; Wolski, P.; Ringrose, S. (Elservier, www.elsevier.com, 2006)Changes in hydrological inputs to the flood-pulsed Okavango Delta result in changes in such flooding characteristics as floodplain water depth, inundation duration and frequency. A mathematical model is used to assess ... -
Simulation of DOM fluxes in a seasonal floodplain of the Okavango Delta, Botswana
Mladenov, N.; McKnight, D.M.; Wolski, P.; Murray-Hudson, M. (Elsevier, www.elsevier.com/locate/ecolmodel, 2007)In order to examine dissolved organic matter (DOM) fluxes in seasonal wetland systems that expand and contract seasonally, a time-variable model of dissolved organic carbon (DOC) was developed for a seasonal floodplain ... -
Temperature-Emissivity separation with ASTER and LANDSAT 7 validation on the fringe of the Okavango Delta, Botswana
Gieske, A.S.; Wubett, M.T.; Timmermans, W.J.; Parodi, G.N.; Wolski, P.; Arneth, A. (SPIE, http://link.aip.org, 2004)Land surface temperatures are important in global change studies, in estimating radiation budget, heat balance studies and as control for climate models. Several algorithms for estimating land surface temperature and ... -
Tropical wetlands: seasonal hydrologic pulsing, carbon sequestration and methane emissions
Mitsch, W.J.; Nahlik, A.; Wolski, P.; Bernal, B.; Zhang, L.; Ramberg, L. (Springer, http://www.springer.com, 2010)This paper summarizes the importance of climate on tropical wetlands. Regional hydrology and carbon dynamics in many of these wetlands could shift with dramatic changes in these major carbon storages if the inter-tropical ... -
Vegetation cover trends along the Botswana Kalahari transect
Ringrose, S.; Matheson, W.; Wolski, P.; Huntsman-Mapila, P. (Elsevier; www.elsevier.com/locate/jaridenv, 2003)Vegetative response aspects of climate change studies include the determination of vegetation cover changes across climatic gradients. Vegetation characteristics and soil moisture measurements were obtained from four ... -
A vegetation-based hierarchical classification for seasonally pulsed floodplains in the Okavango Delta, Botswana
Murray-Hudson, M.; Combs, F.; Wolski, P.; Brown, M.T. (Taylor & Francis, http://taylorandfrancis.com, 2011-12-11)A classification scheme is presented for seasonal floodplains of the Boro-Xudum distributary of the Okavango Delta, Botswana. This distributary is subject to an annual flood-pulse, the inundated area varying from a mean ... -
Water balance and infiltration in a seasonal floodplain in the Okavango Delta, Botswana
Ramberg, L.; Wolski, P.; Krah, M. (Springer link, http://link.springer.com, 2006)Water balance in a seasonal floodplain in the Okavango Delta, Botswana was determined for three years (1997–1999). There was no surface outflow, and infiltration to ground water was very large (4.7–9.7 m during 90–175 days ... -
Water flow dynamics in the Okavango River Basin and Delta - a prerequisite for the ecosystems of the Delta
Andersson, L.; Gumbricht, T.; Hughes, D.; Kniveton, D.; Ringrose, S.; Savenije, H.; Todd, M.; Wilk, J.; Wolski, P. (Elsvier, www.elsevier.com, 2003-09-08)As part of the EU-funded project ‘Water and Ecosystem Resources in Regional Development––Balancing Societal Needs and Wants and Natural Resources Systems Sustainability in International River Basin Systems’ (WERRD) ...