Assessing the impact of land use and land cover change on streamflow response: case study of Dinder and Rahad, Ethiopia/Sudan Khalid E. A. Hassaballah,

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  Assessing the impact of land use and land cover change on streamflow response: case study of Dinder and Rahad, Ethiopia/Sudan Khalid E. A. Hassaballah, MSc. (HRC-Sudan, IHE-Delft) Prof. Dr.Stefan Uhlenbrook, Ph.D.(UNESCO-IHE, TU Delft), Associate Prof. Yasir.A. Mohamed, MSc, PhD (HRC-Sudan, IHE-Delft), Dr. Khalid Biro, MSc, PhD (HRC-Sudan) 10/24/2017 NBDF, Kigali, Rwanda 23 to 25th October 2017

Study area The Dinder and the Rahad (approximately 77,504 km2) are the lower sub-basins of the Blue Nile River basin. The Dinder Natural Park (DNP) is the most unique feature of the basin. The water system of the park includes river Dinder and Rahad and their tributaries and Mayas wetlands 10/24/2017 NBDF, Kigali, Rwanda 23 to 25th October 2017

Areas of some Mayas wetlands inside the DNP are decreased. Problem statement Areas of some Mayas wetlands inside the DNP are decreased. Some Mayas are completely dry. Lost of wetlands ecosystem services for instance; the water and food supply available for wildlife ,tourism etc. Lost of biodiversity Some Mayas are artificially watered from boreholes, and some from the river by artificial feeders during the wet season. 10/24/2017 NBDF, Kigali, Rwanda 23 to 25th October 2017

Objectives, Approach, Tools and data The objective of this study is to understand the LULCC in the Dinder and Rahad and its implications on streamflow response using satellite data and hydrological modelling. Approach: Use of (freely available) global datasets Modelling catchment hydrology Modelling effect of LULC changes Analyzing the streamflow characteristics Tools: Arc GIS QGIS ERDAS Imagine PCRaster Wflow hydrological model Data: Very limited ground measurements data (in Sudan and Ethiopia) Dem (SRTM 90m) , soil (FAO, HWSD), LULC (landstat), SBRE The central objective of the SOSADC project is to develop an adequate sediment management strategy for the ADC and an optimal set of reservoir operation rules 10/24/2017 NBDF, Kigali, Rwanda 23 to 25th October 2017

Land Cover Acquisition date Satellite Number of scenes Spectral bands Spatial resolution 04 Nov. & 11 Dec. 1972 Landsat MSS 9 1 – 4 bands 60 m 12 Nov. & 26 Nov. 1986 Landsat TM 1 – 6 bands 30 m 27 Nov. & 13 Dec. 1998 8 07 Nov. & 10 Dec. 2011 Accuracy assessment (%) of LULC maps. LULC Classes 1972 1986 1998 2011 Producer’s User’s Woodland 88 89 90 91 93 Cropland 78 70 80 74 83 82 Shrubland 71 73 75 77 Grassland 85 86 Bare Land 76 Water 94 Overall 84 87 Kappa 79 81 10/24/2017 NBDF, Kigali, Rwanda 23 to 25th October 2017

SBRE NBDF, Kigali, Rwanda 23 to 25th October 2017 10/24/2017 Product Developer Spatial resolution Covering area Temporal resolution Time span Ground measurement TRMM 3B42v7 NASA, JAXA 0.25° 0°E-360°E/50°N-50°S 3 Hourly Jan 1998 - present Yes RFE 2.0 NOAA (CPC) 0.1° 20°E-55°E/40°N-40°S 6 Hourly Jan 2001 - present CHIRPS v2.0 CHG 0.05° Daily Jan 1981 - present PET 1.0° 10/24/2017 NBDF, Kigali, Rwanda 23 to 25th October 2017

Distributed Hydrological Modelling WFlow distributed hydrological modeling platform (PCRaster-based with python extension) (Schellekens, 2011) WFLOW_SBM (based on Gash, 1979 and TOPOG) 10/24/2017 NBDF, Kigali, Rwanda 23 to 25th October 2017

WFlow Calibration Results Dinder Rahad 10/24/2017 NBDF, Kigali, Rwanda 23 to 25th October 2017

LULC Changes Results Land cover changes (%) in Dinder and Rahad basins that occurred in the period 1972 to 1986, 1986 to 1998, and 1998 to 2011. Land cover type (%) Dinder 1972   1986 1998 2011 Rahad Bare area 5 1 2 6 3 Woodland 42 23 27 14 35 21 Shrubland 43 36 30 32 13 15 Grassland 16 18 11 22 9 Cropland 45 47 26 55 68 10/24/2017 NBDF, Kigali, Rwanda 23 to 25th October 2017

Streamflow Results Magnitude of river extreme floods-IHA Annual-Wflow Rate of change in flow-IHA 10/24/2017 NBDF, Kigali, Rwanda 23 to 25th October 2017

Conclusion The LULCC results showed that the dominant process is the relatively large decrease of woodland and the large increase of cropland. LULCC detection between 1972 and 2011 indicate a significant decrease of woodland and an increase of cropland. Woodland decreased from 42% to 14% and from 35% to 14% for Dinder and Rahad respectively. Cropland increased from 14% to 47% and from 18% to 68% in Dinder and Rahad respectively. The rate of deforestation is high during the period 1972-1986 and probably is due to the severe drought during 1984/1985, expansion in agricultural activities and increased demand for wood for fuel, construction and other human needs due to the increase in population. 10/24/2017 NBDF, Kigali, Rwanda 23 to 25th October 2017

Conclusion….cont The hydrological model results indicate that streamflow is affected by LULCC in both the Dinder and the Rahad Rivers. The effect of LULCC on streamflow is significant during 1986 and 2011 particularly in the Rahad River. This could be attributed to the severe drought during 1984/1985 and the large expansion in cropland in the Rahad catchment to 68% of the total area in 2011. The IHA analysis indicated that the flow of the Dinder and the Rahad Rivers was associated with significant upward and downward alterations in magnitude and rate of change of river flows. The alterations in the streamflow characteristics are likely to have significant effects on a range of species that depend on the seasonal patterns of flow. Therefore, alterations in the magnitude of the annual floods may reduce the production of native river-floodplain fauna and flora, and result in migration of animals that connected to Mayas wetlands inundation. 10/24/2017 NBDF, Kigali, Rwanda 23 to 25th October 2017

THANK YOU FOR YOUR ATTENTION 10/24/2017 NBDF, Kigali, Rwanda 23 to 25th October 2017