A preliminary study on the relationship between variation of the Earth's rotation channel evolution and sediment disaster

The variation of the Earth's rotation rate is an important factor to influe nce channel evolution and to induce sediment disaster. According to a preli minary data analysis of the Yangtze R., the Yellow R, and the Huaihe R. it is indicated that there exists a relationship between flood, sediment trans portation, channel evolution and the variation of the Earth rotation. As th e Earth rotates from faster to slower, the lower flood and sediment transpo rtation in the lower Yellow R, and the flood with a high frequency and lowe r intensity in the middle and lower Yangtze R. And the Huaihe R. occur. Whe n the Earth rotates from slower to faster, the periods of high flood, mediu m and lower sediment transportation in the lower Yellow R., the flood with a lower frequency and higher intensity in the middle and lower Yangtze R. a nd the Huaihe R. take place, and it is just the most vigorous of chute cuto ff for alternative bars in the Yangtze R., thus induce flood and sediment d isaster. Between the two turning points of the variation of the Earth rotat ion, the channel develops gently and disasters of flood and sediment aren't induced in general.