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How to remove silt from Huang He (Yellow River)
Big basin found to store Yellow River's silt

Winny Wang

2006-11-02

YELLOW River Conservancy Commission has found a big "basin" at the river's middle reaches, which is capable of holding 10 billion tons of silt carried by the Yellow River, Xinhua news agency reported today.

An expert of the commission under the Ministry of Water Resources said most of the 682-square-kilometer basin is salt alkaloid field, which is suitable to host silt from the river.

The new "basin" is roughly the size of Singapore.

The country's second longest river brings 1.3 billion tons of mud from the Loess Plateau into the lower reaches annually, which blocks the waters course.

The commission will collect thick silt from the river by "advanced technologies and methods," which may improve the basin into fertile land, the expert said.

If this basin project works as planned, the riverbed of the Yellow River in its lower reaches will not climb any higher and people won't need to build higher dams.

The commission has tried to reserve 4 million tons of mud in the basin from 2004.

Li Guoying, the director of the commission, said technologies have matured and they will begin using them in the field soon.

专家在黄河中游找到可淤沙100亿吨大泥盆

http://www.sina.com.cn 2006年11月02日10:19 新华网

  新华网郑州11月2日电 (记者林嵬张军) 黄河水利委员会专家日前告诉记者,他们在黄河中游禹门口至潼关河段,找到了一个可淤积泥沙100亿吨的“大泥盆”,假如把这个“泥盆”装满,意味着下游“悬河”25年不再长高。

  禹门口至潼关河段俗称黄河小北干流,河道总面积1100平方公里,其中滩地面积为682平方公里,多为人烟稀少、荆棘丛生的盐碱地,是一个“天然泥盆”。

  从2004年起,黄委会连续三年在小北干流河段进行“放淤”试验,成功地将400多万吨粗泥沙淤积在黄河沿岸的盐碱滩里。

  黄河每年从黄土高原携带13亿吨泥沙进入下游,其中4亿吨淤积在河道里。专家研究发现,黄河下游河道的淤积物中,粒径大于0.05毫米的粗泥沙占相当大的比例。这个发现给人启示,如果能将粗泥沙拦下来,让细泥沙随洪水入海,对于减少下游河道淤积,将起到事半功倍的效果。

  专家指出,黄河小北干流河段,既是一个天然“大泥盆”,又是一个得天独厚的泥沙“分选场”,在这里“放淤”,还可以将两岸的低洼易涝盐碱地变为高产稳产良田。据了解,黄河小北干流“放淤”试验工程项目主要包括放淤闸、输沙渠、弯道溢流堰、淤区围堤、退水闸等。工程利用弯道水力学原理,将来自黄土高原的泥沙通过科学手段和工程措施进行合理调度,借助水流自身力量实现粗、细泥沙的自然分选,把粗泥沙滞留在小北干流两岸洼地,把细泥沙送归黄河,从而实现“淤粗排细”。

  黄委会主任李国英说,试验表明,黄河“大放淤”的技术条件已基本成熟,黄河泥沙治理新战场即将开辟。

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