Table 4. Estimated Sediment Discharge at Datong Station and Sediment Contributing to the Changjiang Estuary and its Subaqueous Delta After Completion of the Three Gorges Dam										
	Time Periods After TGD Completion									
	2010-2020	2020-2030	2030-2040	2040-2050	2050-2060	2060-2070	2070-2080	2080-2090	2090-2100	2100-2110
Export ratio of sediment discharge from the TGR, %	29.9	31	36.6	43.3	52.7	67.4	77.4	84.5	87.6	89.7
Average export ratio of sediment discharge from the TGR, %	30.5	30.5	44.2	44.2	44.2	81.3	81.3	81.3	81.3	81.3
Sediment discharge from Yichang, mt/yr	130	130	180	180	180	330	330	330	330	330
River bed erosion/										
accumulation, 										
106 m3/yra	83	83	44	44	44	-14	-14	-14	-14	-14
Sediment discharge at Datong, mt/yr, Approach 1b	210	210	230	230	230	310	310	310	310	310
Sediment discharge at Datong, mt/yr,										
 Approach 2c	240	240	240	240	240	310	310	310	310	310
Sediment contribution to Changjiang estuary and its subaqueous delta, mt/yrd	90	90	94	94	94	124	124	124	124	124	

aValues are proposed by the Academy of Changjiang Research; positive numbers represent erosion, and negative numbers represent accumulation.										
bEstimation is based on the correlation between sediment discharge at Yichang and at Datong: QsD, 0.489 QsY + 144 (equation (1)). QsY is the annual sediment load at Yichang and QsD is the annual sediment load at Datong.										
cEstimation based on the river channel erosion/accumulation from Yichang to Datong. The bulk density of river sediment is taken as 1.35 t/m3.
dAccording to Milliman et al. [1985], the sediment contributing to the Changjiang estuary and its subaqueous delta comprise 40% of the sediment discharges from Datong. The sediment at Datong was the average of the prediction results from two approaches.