WATER SAFETY IN THE GREATER MEKONG REGION
Climate impact indicators
Global essential climate variables/indicators used
Bias adjusted Essential Climate Variables (air temperature and precipitation on daily time scale) for historical and future periods and for both RCPs 4.5 and 8.5 developed within the C3S_422_Lot1_SMHI contract, available in the CDS.
Regional/local indicators used and produced
CIIs related to drought risk were calculated.
Global data to regional/local scale
Step 1: The following data were collected:
-Bias adjusted Essential Climate Variables (air temperature and precipitation on daily time scale) for historical and future periods and for both RCPs 4.5 and 8.5 developed within the C3S_422_Lot1_SMHI contract, available in the CDS.
-Data available from national databases (topography, soil type, river discharge, evapotranspiration, population density, water demand, infrastructures and management rule, drought and flood indicators).
Step 2: This step includes calibration, validation and accuracy assessment of the hydrological model. Data from national databases from Step 1 was used here. For accuracy assessment the following coefficients were used: Root Mean Square Error, Nash – Sutcliffe efficiency, and Kling – Gupta Efficiency.
Step 3: Hydrological simulation were performed using as forcing the bias adjusted ECV to calculate CII for future periods. The following analysis was performed: comparisons of ECVs and model output (surface runoff and outflow; soil moisture deficit and potential evapotranspiration) for historical period.
Step 4: CIIs related to drought risk were calculated and drought risk was assessed based on the result analysis for historical and future periods.
Step 5: The results were communicated to representatives of the national hydrology departments of member countries of the Mekong River basin, especially Vietnam, Lao, and Cambodia.