三峡大坝会导致长江上游干旱中下游枯水吗?水库蓄水后真会加剧地质灾害、诱发地震吗?水库蓄水后泥沙问题难以解决吗? Will the Three Gorges Dam lead to the drought in the lower and middle reaches of the upper reaches of the Yangtze River? Will the geological disasters be intensified after the reservoir is impounding and will the earthquake be triggered? Is the sediment problem difficult to solve after the impoundment of the reservoir?