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  Improved representation of agricultural land use and crop management for large-scale hydrological impact simulation in Africa using SWAT+

Nkwasa, A., Chawanda, C. J., Jägermeyr, J., van Griensven, A. (2022): Improved representation of agricultural land use and crop management for large-scale hydrological impact simulation in Africa using SWAT+. - Hydrology and Earth System Sciences, 26, 1, 71-89.
https://doi.org/10.5194/hess-26-71-2022

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 Urheber:
Nkwasa, Albert1, Autor
Chawanda, Celray James1, Autor
Jägermeyr, Jonas2, Autor              
van Griensven, Ann1, Autor
Affiliations:
1External Organizations, ou_persistent22              
2Potsdam Institute for Climate Impact Research, ou_persistent13              

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 Zusammenfassung: To date, most regional and global hydrological models either ignore the representation of cropland or consider crop cultivation in a simplistic way or in abstract terms without any management practices. Yet, the water balance of cultivated areas is strongly influenced by applied management practices (e.g. planting, irrigation, fertilization, harvesting). The SWAT+ model represents agricultural land by default in a generic way where the start of the cropping season is driven by accumulated heat units. However, this approach does not work for tropical and sub-tropical regions such as the sub-Saharan Africa where crop growth dynamics are mainly controlled by rainfall rather than temperature. In this study, we present an approach on how to incorporate crop phenology using decision tables and global datasets of rainfed and irrigated croplands with the associated cropping calendar and fertilizer applications in a regional SWAT+ model for Northeast Africa. We evaluate the influence of the crop phenology representation on simulations of Leaf Area Index (LAI) and Evapotranspiration (ET) using LAI remote sensing data from Copernicus Global Land Service (CGLS) and WaPOR ET data respectively. Results show that a representation of crop phenology using global datasets leads to improved temporal patterns of LAI and ET simulations especially for regions with a single cropping cycle. However, for regions with multiple cropping seasons, global phenology datasets need to be complemented with local data or remote sensing data to capture additional cropping seasons. In addition, the improvement of the cropping season also helps to improve soil erosion estimates, as the timing of crop cover controls erosion rates in the model. With more realistic growing seasons, soil erosion is largely reduced for most agricultural Hydrologic Response Units (HRUs) which can be considered as a move towards substantial improvements over previous estimates. We conclude that regional and global hydrological models can benefit from improved representations of crop phenology and the associated management practices. Future work regarding the incorporation of multiple cropping seasons in global phenology data is needed to better represent cropping cycles in regional to global hydrological models.

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Sprache(n): eng - Englisch
 Datum: 2021-11-252021-11-252022
 Publikationsstatus: Final veröffentlicht
 Seiten: 19
 Ort, Verlag, Ausgabe: -
 Inhaltsverzeichnis: -
 Art der Begutachtung: Expertenbegutachtung
 Identifikatoren: DOI: 10.5194/hess-26-71-2022
MDB-ID: No data to archive
PIKDOMAIN: RD2 - Climate Resilience
Organisational keyword: RD2 - Climate Resilience
Working Group: Land Use and Resilience
Research topic keyword: Climate impacts
Research topic keyword: Food & Agriculture
Regional keyword: Global
Model / method: Quantitative Methods
OATYPE: Gold Open Access
 Art des Abschluß: -

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Titel: Hydrology and Earth System Sciences
Genre der Quelle: Zeitschrift, other, oa
 Urheber:
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Ort, Verlag, Ausgabe: -
Seiten: - Band / Heft: 26 (1) Artikelnummer: - Start- / Endseite: 71 - 89 Identifikator: CoNE: https://publications.pik-potsdam.de/cone/journals/resource/journals2_228
Publisher: Copernicus