Impacts of climate change on streamflow and reservoir inflows in the Upper Manyame sub-catchment of Zimbabwe
نویسندگان
چکیده
This study focused on the Upper Manyame sub-catchment which covers an area of approximately 3 786 km2 and forms part catchment, one seven catchments Zimbabwe. catchment has its source in Marondera town drains into Zambezi River downstream Kariba Dam upstream Cahora Bassa Dam, northern country. assessed potential climate change impacts streamflow reservoir inflows sub-catchment. Hydrologic simulations for future (2030s 2060s) were carried out using statistically downscaled bias-corrected variables from HadCM3 (HadCM3A2a HadCM3B2a scenarios) CanESM2 (RCP2.6 RCP8.5) global circulation models. The HEC–HMS hydrological model was set up two gauged micro-catchments eight ungauged tributary micro-catchments. Model calibration over period 2000–2010 revealed satisfactory performance 4.3% (RVE) 0.1 (bias) Mukuvisi micro-catchment 9.5% 0.15 Marimba micro-catchment. resulted a projected decrease by 7.4–26.4% HadCM3. For CanESM2, 2.5–34.7%. Reservoir Lake Chivero Manyame, main water supply sources Harare, will 10.5–18% 8–33.6% CanESM2.
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ژورنال
عنوان ژورنال: Water SA
سال: 2022
ISSN: ['0378-4738', '1816-7950']
DOI: https://doi.org/10.17159/wsa/2022.v48.i4.3920