黄河北干流河道泥沙的输移与沉积

河口镇一龙门区间有２３１６６ｋｍ＾２面积属于未控区，占河口镇一龙门区间面积的２０％。１９６４－１９８８年２５年全沙年均淤积量为０．０９９亿ｔ。

Sediment Transportation and Deposit in North Main Reaches of Yellow River

here are uncontrolling area of 22, 313km2 in the region between Hekozhen to Longmen,which.is account for 20%. of the total area. The paper inquired into the sediment yield in the uncbntrolling area on the basis of precipitation and sediment transportation relation curver,and obtained basic erosion and accumulation law of river tunnel of north main reaches according to sediment yield banlance principle, i. e.,accumulation takes place in flood poriods; the upper reaches are eroded and the lowers eroded or deposited sightly when floods come from upper Hekozhen,accumulation occurs when there are flood between Fugu and Wubu,and lower reaches are silted a little;and when. floods happen in lower Wubu,some reaches are silted and some eroded. Floods with d<0.01mm and sediment content over 100kg/m3 are favourable to erosion, even bottom tearing scour in lower Huko reaches. River channel erosion occurs in nonflood seasons or dry seasons,the upper reaches are eroded with much volume,the lowers eroded a little and sometimes deposited. When floods are with d> 0. 05mm and sediment weight of over 50%, accumulation amount may be over 50 million tons. The total sediment accumulation is smaller than that of d>0. 05mm during deposition,and the total sediment erosion is over than that of d>0. 05mm during erosion process. The average accumulation of 25 years from 1964 to 1988 is 9. 9 million tons.