青海湖人湖沙质物的计算与水下沙堤的形成

青海湖流域沙漠以环湖分布为特点,又以ENE为集中。这一状态使多方向的风沙流入湖,而实际上入湖沙量是以W、N、E三个方向的流沙为主。根据入湖风沙公式计算,入湖风沙量为887.08×10⁴t/a。并推算出河流泥沙入湖为35.77×10⁴t/a,空中降尘为30.36×10⁴t/a。入湖后的沙质物在湖流、波浪的作用下,由西向东运移,堆积成水下沙堤,逐渐增高加宽露出水面,分隔成子湖。同时在干燥的气候作用下,导致湖面收缩,生态环境恶化。

The calculation of sand discharge entering qinghai lake and formation of submerged barries

The distribution of sand dune in Qinghai Lake Basin is characterized by a surrounding lake specially concentration at EEN shore. Therefore, the wind sand can enter the lake from difference directions, in fact, max. quantity of sand comes fom east t west and north directions. According to the calculation by the formula, the wind drift sand discharge of eatering the lake is about 88.708×10⁵ t/a, the silt discharge of empting the lake by rivers about 3.577×10⁵ t/a, and the falling dust discharge from air about 3.036×10⁵ t/a, The sandy materials entering the lake were transported by the lake wave and currents from west to east, forming the subaqueous barriers. The sandy barriers gradually became higher and wider, and emerged from the water by which lagooas were insolated from the lake. At the same time9owing to strong evaporation9the lake began to shrink and its ecological envivonments to get deteriorated.