黄河的根本问题是泥沙问题。据多年资料统计,黄河平均每年约有16亿吨泥沙下泄。这些泥沙,在三门峡水库修建以前,平均每年约有4亿吨淤积在下游河道里,使河床年年抬高,增加了决口改道的危险,威胁着下游两岸25万平方公里内8千万人民的生命和生产的安全;三门峡水库修建以后,大量泥沙又淤积在库区,引起渭、洛河下游河道洪水位升高,直接影 The fundamental problem of the Yellow River is sediment. According to statistics from many years, the Yellow River has an average annual discharge of about 1.6 billion tons of sediment. Before the construction of the Sanmenxia Reservoir, these silt averages about 400 million tons of silt in the lower reaches of the river every year, elevating the riverbed every year, increasing the danger of a breakthrough in diversion and threatening the 80 million people in 250,000 square kilometers on both sides of the lower reaches After the Sanmenxia Reservoir was constructed, a large amount of sediment was deposited in the reservoir area again, causing the Wei River and flood in the lower reaches of the Luo River to rise in direct water