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  • 1. Aich, Valentin
    et al.
    Liersch, Stefan
    Vetter, Tobias
    Andersson, Jafet
    SMHI, Forskningsavdelningen, Hydrologi.
    Mueller, Eva N.
    Hattermann, Fred F.
    Climate or Land Use?-Attribution of Changes in River Flooding in the Sahel Zone2015Ingår i: Water, ISSN 2073-4441, E-ISSN 2073-4441, Vol. 7, nr 6, s. 2796-2820Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    This study intends to contribute to the ongoing discussion on whether land use and land cover changes (LULC) or climate trends have the major influence on the observed increase of flood magnitudes in the Sahel. A simulation-based approach is used for attributing the observed trends to the postulated drivers. For this purpose, the ecohydrological model SWIM (Soil and Water Integrated Model) with a new, dynamic LULC module was set up for the Sahelian part of the Niger River until Niamey, including the main tributaries Sirba and Goroul. The model was driven with observed, reanalyzed climate and LULC data for the years 1950-2009. In order to quantify the shares of influence, one simulation was carried out with constant land cover as of 1950, and one including LULC. As quantitative measure, the gradients of the simulated trends were compared to the observed trend. The modeling studies showed that for the Sirba River only the simulation which included LULC was able to reproduce the observed trend. The simulation without LULC showed a positive trend for flood magnitudes, but underestimated the trend significantly. For the Goroul River and the local flood of the Niger River at Niamey, the simulations were only partly able to reproduce the observed trend. In conclusion, the new LULC module enabled some first quantitative insights into the relative influence of LULC and climatic changes. For the Sirba catchment, the results imply that LULC and climatic changes contribute in roughly equal shares to the observed increase in flooding. For the other parts of the subcatchment, the results are less clear but show, that climatic changes and LULC are drivers for the flood increase; however their shares cannot be quantified. Based on these modeling results, we argue for a two-pillar adaptation strategy to reduce current and future flood risk: Flood mitigation for reducing LULC-induced flood increase, and flood adaptation for a general reduction of flood vulnerability.

  • 2. Aich, Valentin
    et al.
    Liersch, Stefan
    Vetter, Tobias
    Fournet, Samuel
    Andersson, Jafet
    SMHI, Forskningsavdelningen, Hydrologi.
    Calmanti, Sandro
    van Weert, Frank H. A.
    Hattermann, Fred F.
    Paton, Eva N.
    Flood projections within the Niger River Basin under future land use and climate change2016Ingår i: Science of the Total Environment, ISSN 0048-9697, E-ISSN 1879-1026, Vol. 562, s. 666-677Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    This study assesses future flood risk in the Niger River Basin (NRB), for the first time considering the simultaneous effects of both projected climate change and land use changes. For this purpose, an ecohydrological process-based model (SWIM) was set up and validated for past climate and land use dynamics of the entire NRB. Model runs for future flood risks were conducted with an ensemble of 18 climate models, 13 of them dynamically downscaled from the CORDEX Africa project and five statistically downscaled Earth System Models. Two climate and two land use change scenarios were used to cover a broad range of potential developments in the region. Two flood indicators (annual 90th percentile and the 20-year return flood) were used to assess the future flood risk for the Upper, Middle and Lower Niger as well as the Benue. The modeling results generally show increases of flood magnitudes when comparing a scenario period in the near future (2021-2050) with a base period (1976-2005). Land use effects are more uncertain, but trends and relative changes for the different catchments of the NRB seem robust. The dry areas of the Sahelian and Sudanian regions of the basin show a particularly high sensitivity to climatic and land use changes, with an alarming increase of flood magnitudes in parts. A scenario with continuing transformation of natural vegetation into agricultural land and urbanization intensifies the flood risk in all parts of the NRB, while a "regreening" scenario can reduce flood magnitudes to some extent. Yet, land use change effects were smaller when compared to the effects of climate change. In the face of an already existing adaptation deficit to catastrophic flooding in the region, the authors argue for a mix of adaptation and mitigation efforts in order to reduce the flood risk in the NRB. (C) 2016 Elsevier B.V. All rights reserved.

  • 3.
    Andersson, Jafet
    et al.
    SMHI, Forskningsavdelningen, Hydrologi.
    Ali, Abdou
    Arheimer, Berit
    SMHI, Forskningsavdelningen, Hydrologi.
    Gustafsson, David
    SMHI, Forskningsavdelningen, Hydrologi.
    Minoungou, Bernard
    Providing peak river flow statistics and forecasting in the Niger River basin2017Ingår i: Physics and Chemistry of the Earth, ISSN 1474-7065, E-ISSN 1873-5193, Vol. 100, s. 3-12Artikel i tidskrift (Refereegranskat)
  • 4.
    Andersson, Jafet
    et al.
    SMHI, Forskningsavdelningen, Hydrologi.
    Arheimer, Berit
    SMHI, Forskningsavdelningen, Hydrologi.
    Hjerdt, Niclas
    SMHI, Samhälle och säkerhet.
    Combine and Share Essential Knowledge for Sustainable2016Ingår i: The Solutions Journal, ISSN 2154-0926, Vol. 7, nr 3, s. 30-32Artikel i tidskrift (Övrig (populärvetenskap, debatt, mm))
  • 5.
    Andersson, Jafet
    et al.
    SMHI, Forskningsavdelningen, Hydrologi.
    Arheimer, Berit
    SMHI, Forskningsavdelningen, Hydrologi.
    Hjerdt, Niclas
    SMHI, Samhälle och säkerhet.
    Combine and Share Essential Knowledge for Sustainable Water Management2016Ingår i: Solutions Journal, ISSN 2154-0896, E-ISSN 2154-0926, Vol. 7, nr 3Artikel i tidskrift (Övrig (populärvetenskap, debatt, mm))
  • 6.
    Andersson, Jafet
    et al.
    SMHI, Forskningsavdelningen, Hydrologi.
    Arheimer, Berit
    SMHI, Forskningsavdelningen, Hydrologi.
    Traore, Farid
    Gustafsson, David
    SMHI, Forskningsavdelningen, Hydrologi.
    Ali, Abdou
    Process refinements improve a hydrological model concept applied to the Niger River basin2017Ingår i: Hydrological Processes, ISSN 0885-6087, E-ISSN 1099-1085, Vol. 31, nr 25, s. 4540-4554Artikel i tidskrift (Refereegranskat)
  • 7.
    Andersson, Jafet
    et al.
    SMHI, Forskningsavdelningen, Hydrologi.
    Pechlivanidis, Ilias
    SMHI, Forskningsavdelningen, Hydrologi.
    Gustafsson, David
    SMHI, Forskningsavdelningen, Hydrologi.
    Donnelly, Chantal
    SMHI, Forskningsavdelningen, Hydrologi.
    Arheimer, Berit
    SMHI, Forskningsavdelningen, Hydrologi.
    Key factors for improving large-scale hydrological model performance2015Ingår i: European Water, ISSN 1792-085X, Vol. 49, s. 77-88Artikel i tidskrift (Refereegranskat)
  • 8.
    Andersson, Jafet
    et al.
    SMHI, Forskningsavdelningen, Hydrologi.
    Zehnder, Alexander J. B.
    Wehrli, Bernhard
    Jewitt, Graham P. W.
    Abbaspour, Karim C.
    Yang, Hong
    Improving Crop Yield and Water Productivity by Ecological Sanitation and Water Harvesting in South Africa2013Ingår i: Environmental Science and Technology, ISSN 0013-936X, E-ISSN 1520-5851, Vol. 47, nr 9, s. 4341-4348Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    This study quantifies the potential effects of a set of technologies to address wafer and fertility constraints in rain. fed smallholder agriculture in South Africa, namely in situ water harvesting (WH), external WH, and ecological sanitation (Ecosan, fertilization with human urine); We Used the Soil and Water Assessment Tool to model spatiotemporally differentiated effects on maize yield, river flow, evaporation, and transpiration. Ecosan Met some of the plant nitrogen demands, which significantly increased maize yields by 12% and transpiration by 2% on average across South Africa. In situ and external WH did not significantly affect the yield, transpiration or river flow on the South Africa scale. However, external WH. more than doubled the yields for specific seasons and locations. WH particularly increased the lowest yields. Significant, water and nutrient demands remained even with WH and Ecosan management. Additional fertility enhancements raised the yield levels but also the yield variability, whereas soil moisture enhancements improved the yield stability. Hence, coupled policies' addressing both constraints will likely be Most effective for improving food security.

  • 9.
    Donnelly, Chantal
    et al.
    SMHI, Forskningsavdelningen, Hydrologi.
    Andersson, Jafet
    SMHI, Forskningsavdelningen, Hydrologi.
    Arheimer, Berit
    SMHI, Forskningsavdelningen, Hydrologi.
    Using flow signatures and catchment similarities to evaluate the E-HYPE multi-basin model across Europe2016Ingår i: Hydrological Sciences Journal, ISSN 0262-6667, E-ISSN 2150-3435, Vol. 61, nr 2, s. 255-273Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Open data make it possible to set up multi-basin models for large domains across environmental, climate and administrative boundaries. This study presents new methods for evaluating a number of aspects of multi-basin model performance, while exploring the performance of the E-HYPE_v2.1 model for several evaluation criteria in 181 independent river gauges across the European continent. Embedded model assumptions on dominant flow generating mechanisms are analysed by correlating physiographical characteristics to the flow regime. The results indicate that the model captures the spatial variability of flow and is therefore suitable for predictions in ungauged basins. The model shows good performance of long-term means and seasonality, while short-term daily variability is less well represented, especially for Mediterranean and mountainous areas. Major identified shortcomings refer to the resolution of precipitation patterns, aquifer exchanges, water extractions and regulation. This will guide the work with the next model version for which improvements in input data, processes and calibration have been identified to potentially contribute most to improved model performance. [GRAPHICS]

  • 10.
    Donnelly, Chantal
    et al.
    SMHI, Forskningsavdelningen, Hydrologi.
    Greuell, Wouter
    Andersson, Jafet
    SMHI, Forskningsavdelningen, Hydrologi.
    Gerten, Dieter
    Pisacane, Giovanna
    Roudier, Philippe
    Ludwig, Fulco
    Impacts of climate change on European hydrology at 1.5, 2 and 3 degrees mean global warming above preindustrial level2017Ingår i: Climatic Change, ISSN 0165-0009, E-ISSN 1573-1480, Vol. 143, nr 1-2, s. 13-26Artikel i tidskrift (Refereegranskat)
  • 11.
    Donnelly, Chantal
    et al.
    SMHI, Forskningsavdelningen, Hydrologi.
    Greuell, Wouter
    Andersson, Jafet
    SMHI, Forskningsavdelningen, Hydrologi.
    Gerten, Dieter
    Pisacane, Giovanna
    Roudier, Philippe
    Ludwig, Fulco
    Impacts of climate change on European hydrology at 1.5, 2 and 3 degrees mean global warming above preindustrial level (vol 143, pg 13, 2017)2017Ingår i: Climatic Change, ISSN 0165-0009, E-ISSN 1573-1480, Vol. 143, nr 3-4, s. 535-535Artikel i tidskrift (Refereegranskat)
  • 12. Roudier, Philippe
    et al.
    Andersson, Jafet
    SMHI, Forskningsavdelningen, Hydrologi.
    Donnelly, Chantal
    SMHI, Forskningsavdelningen, Hydrologi.
    Feyen, Luc
    Greuell, Wouter
    Ludwig, Fulco
    Projections of future floods and hydrological droughts in Europe under a+2 degrees C global warming2016Ingår i: Climatic Change, ISSN 0165-0009, E-ISSN 1573-1480, Vol. 135, nr 2, s. 341-355Artikel i tidskrift (Refereegranskat)
1 - 12 av 12
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