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Table 5. Frequency (%) of drought levels of the four drought indices in season. Standardized Precipitation Index, SPI Standardized Precipitation Evapotranspiration Index, SPEI; Standardized Soil Moisture Index, SSI; Standardizec Integrated Drought Index, SIDI

Table 5 Frequency (%) of drought levels of the four drought indices in season. Standardized Precipitation Index, SPI Standardized Precipitation Evapotranspiration Index, SPEI; Standardized Soil Moisture Index, SSI; Standardizec Integrated Drought Index, SIDI

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Fig. 1. Cai River basin, Vietnam.
Fig. 1. Cai River basin, Vietnam.
Table 1. Standard Precipitation Index (SPI), Standardized Precipitation Evapotranspiration Index (SPEI), and Standardized Soil Moisture Index (SSD) classifications
Table 1. Standard Precipitation Index (SPI), Standardized Precipitation Evapotranspiration Index (SPEI), and Standardized Soil Moisture Index (SSD) classifications
Fig. 2. Streamflow simulated and observed at Dongtrang Station (1983-2000). where y,, Y. are the values of the first and second main components, respectively; a and b are the contribution rates of the first and second main components, respec- tively; and c, d, e and f, g, h are the contribution rates of HX, %, Xin the first and second main components, respec- tively.
Fig. 2. Streamflow simulated and observed at Dongtrang Station (1983-2000). where y,, Y. are the values of the first and second main components, respectively; a and b are the contribution rates of the first and second main components, respec- tively; and c, d, e and f, g, h are the contribution rates of HX, %, Xin the first and second main components, respec- tively.
Table 2. Variable Infiltration Capacity (VIC) user—calibrated hydrological parameters
Table 2. Variable Infiltration Capacity (VIC) user—calibrated hydrological parameters
Table 3. Values of parameters used in determining the Integrated Drought Index
Table 3. Values of parameters used in determining the Integrated Drought Index
Fig. 3. Streamflow simulated and observed at Dongtrang Station (2001-2012).
Fig. 3. Streamflow simulated and observed at Dongtrang Station (2001-2012).
Fig. 5. The four drought indices events during three-month periods from 1983 to 2012. Standardized Precipitation Index, SPI; Standardized Precipitation Evapotranspiration Index, SPEI; Standardized Soil Moisture Index, SSI; Standardized Integrated Drought Index, SIDI.
Fig. 5. The four drought indices events during three-month periods from 1983 to 2012. Standardized Precipitation Index, SPI; Standardized Precipitation Evapotranspiration Index, SPEI; Standardized Soil Moisture Index, SSI; Standardized Integrated Drought Index, SIDI.
Fig. 6. The four drought indices events during six-month periods from 1983 to 2012. Standardized Precipitation Index, SPI; Standardized Precipitation Evapotranspiration Index, SPEI; Standardized Soil Moisture Index, SSI; Standardized Integrated Drought Index, SIDI.
Fig. 6. The four drought indices events during six-month periods from 1983 to 2012. Standardized Precipitation Index, SPI; Standardized Precipitation Evapotranspiration Index, SPEI; Standardized Soil Moisture Index, SSI; Standardized Integrated Drought Index, SIDI.
Fig. 7. The four drought indices events during 12-month periods from 1983 to 2012. Standardized Precipitation Index, SPI; Standardized Precipitation Evapotranspiration Index, SPEI; Standardized Soil Moisture Index, SSI; Standardized Integrated Drought Index, SIDI.
Fig. 7. The four drought indices events during 12-month periods from 1983 to 2012. Standardized Precipitation Index, SPI; Standardized Precipitation Evapotranspiration Index, SPEI; Standardized Soil Moisture Index, SSI; Standardized Integrated Drought Index, SIDI.
Table 4. Frequency (%) of drought levels of the four drought indices: Standardized Precipitation Index, SPI; Standardized Precipitation Evapotranspiration Index, SPEI; Standardized Soil Moisture Index, SSI; Standardized Integrated Drought Index, SIDI
Table 4. Frequency (%) of drought levels of the four drought indices: Standardized Precipitation Index, SPI; Standardized Precipitation Evapotranspiration Index, SPEI; Standardized Soil Moisture Index, SSI; Standardized Integrated Drought Index, SIDI
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