The Use of SPEI and TVDI to Assess Temporal-Spatial Variations in Drought Conditions in the Middle and Lower Reaches of the Yangtze River Basin, China

<div>Monthly contours of the (a) SPEI-1, (b) SPEI-3, (c) SPEI-6, and (d) SPEI-12 values and the drought events of different severity grades during 1961–2013. <i>Note</i>. SPEI-1, SPEI-3, SPEI-6, and SPEI-12 represent the SPEI values calculated on timescales of 1, 3, 6, and 12 months.</div>

Advances in Meteorology

fig3

Figure 3

Figure 3: The Use of SPEI and TVDI to Assess Temporal-Spatial Variations in Drought Conditions in the Middle and Lower Reaches of the Yangtze River Basin, China 

Figure 3 | The Use of SPEI and TVDI to Assess Temporal-Spatial Variations in Drought Conditions in the Middle and Lower Reaches of the Yangtze River Basin, China 