scholarly journals Analysis of streamflow response to land use land cover changes using satellite data and hydrological modelling: case study of Dinder and Rahad tributaries of the Blue Nile (Ethiopia/Sudan)

2017 ◽  
Author(s):  
Khalid Hassaballah ◽  
Yasir Mohamed ◽  
Stefan Uhlenbrook ◽  
Khalid Biro
Keyword(s):  
Land Use ◽  
Land Cover ◽  
Satellite Data ◽  
Hydrological Modelling ◽  
Model Parameters ◽  
Land Cover Changes ◽  
Severe Drought ◽  
Blue Nile ◽  
Large Expansion ◽  
Streamflow Response

Abstract. Understanding the land use and land cover changes (LULCC) and its implication on surface hydrology of the Dinder and Rahad basins (D&R) approximately 77,504 km2 is vital for the management and utilization of water resources in the basins. Although there are many studies on LULCC in the Blue Nile basin, specific studies on LULCC in the D&R are still missing. Hence, its impact on streamflow is unknown. The objective of this paper is to understand the LULCC in the Dinder and Rahad and its implications on streamflow response using satellite data and hydrological modelling. The hydrological model has been derived by different sets of LULC maps from 1972, 1986, 1998 and 2011. Catchment topography, land cover and soil maps, are derived from satellite images and serve to estimate model parameters. Results of 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 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. This could be attributed to the severe drought during mid 1980s and the recent large expansion in cropland.

scholarly journals Analysis of streamflow response to land use and land cover changes using satellite data and hydrological modelling: case study of Dinder and Rahad tributaries of the Blue Nile (Ethiopia–Sudan)

2017 ◽  
Vol 21 (10) ◽  
pp. 5217-5242 ◽  
Author(s):  
Khalid Hassaballah ◽  
Yasir Mohamed ◽  
Stefan Uhlenbrook ◽  
Khalid Biro
Keyword(s):  
Land Use ◽  
Land Cover ◽  
Satellite Data ◽  
Hydrological Modelling ◽  
Model Parameters ◽  
Land Cover Changes ◽  
Severe Drought ◽  
Blue Nile ◽  
Large Expansion ◽  
Streamflow Response

Abstract. Understanding the land use and land cover changes (LULCCs) and their implication on surface hydrology of the Dinder and Rahad basins (D&R, approximately 77 504 km2) is vital for the management and utilization of water resources in the basins. Although there are many studies on LULCC in the Blue Nile Basin, specific studies on LULCC in the D&R are still missing. Hence, its impact on streamflow is unknown. The objective of this paper is to understand the LULCC in the Dinder and Rahad and its implications on streamflow response using satellite data and hydrological modelling. The hydrological model has been derived by different sets of land use and land cover maps from 1972, 1986, 1998 and 2011. Catchment topography, land cover and soil maps are derived from satellite images and serve to estimate model parameters. Results of LULCC detection between 1972 and 2011 indicate a significant decrease in woodland and an increase in 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 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. This could be attributed to the severe drought during the mid-1980s and the recent large expansion in cropland.

scholarly journals Quantifying the impact of land cover changes on hydrological extremes in India

2020 ◽  
Author(s):  
Shaini Naha ◽  
Miguel A. Rico-Ramirez ◽  
Rafael Rosolem
Keyword(s):  
Land Use ◽  
Land Cover ◽  
River Basin ◽  
Land Surface ◽  
Distributed Model ◽  
Model Parameters ◽  
Land Cover Changes ◽  
Area Index ◽  
Mahanadi River ◽  
The Impact

Abstract. Several research studies have addressed the effects of future climate changes on the hydrological regime of Mahanadi river basin located in eastern part of India. However, studies investigating the effects of future land cover changes on hydrology are limited owing to the lack of availability of projected land cover scenarios. Our study investigates how the hydrology of Mahanadi river basin would respond to the current and future land cover scenarios under a large-scale hydrological modelling framework. Both historical and future land cover scenarios from the recently released, Land use Harmonisation (LUH2) project for CMIP6, indicates cropland and forest are the major land cover types in the basin with a noticeable increase in the cropland (23.3 %) at the expense of forest (22.65 %) by the end of year 2100 compared to the baseline year, 2005. A physically semi-distributed model, the Variable Infiltration Capacity has been set up and implemented over the Mahanadi river basin system for the time period 1990–2010. The uncertain model parameters were subjected to Sensitivity Analysis and calibrated within a Monte Carlo framework. The best set of calibrated models obtained is used in conjunction with the harmonized set of present and future land use scenarios from LUH2 at 25 km by 25 km resolution to generate an ensemble of model simulations that captures a range of plausible impacts of land cover changes on discharge and other hydrological components of the basin. Overall, model simulation results indicate an increase in the extreme flows (i.e., 95th percentile or higher) in the range of 0.12 to 21 % at multiple subcatchments within the basin. This increase can be attributed to the direct conversion of forested areas to agriculture (on the order of 30,000 km2) that has reduced the Leaf Area Index and subsequently reduces the Evapotranspiration (ET). These changes ultimately affect other water balance components at the land surface, resulting in an increase in surface runoff and baseflow, respectively.

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