sand conditioning meaning in English

旧砂处理
型砂制备

The results indicated that with the change of water and sand condition and the altitude of tongguan and the development of the industry and agriculture in recent decades , the water environment of wei river had changed largely , which were shown as follow : annual runoff and seasonal flood decreased sharply ; water stream of large discharge decreased and the range of runoff decreased greatly ; sediment load per year decreased generally , sediment concentration of water increased , and the sand silting up was serious ; water channel swung and shrank , and water regime deteriorated ; frequencies of big floods decreased obviously , and hyper concentrated flood increased obviously ; water levels of the same runoff rose universally , and the frequencies of the floods increased and aggravated ; water pollution was very serious
结果表明，近期随着水沙条件、潼关高程等的变化及工农业的发展，渭河的水环境发生了巨大变化，表现在年水量及汛期水量锐减；大流量级水流出现次数减少，水量减少幅度大；年输沙量总体减少，河水含沙量增大，泥沙淤积严重；河道向摆动型发展，河道萎缩，河势恶化；大洪水发生的次数显著减少，高含沙小洪水明显增多；同流量洪水位普遍抬高，洪灾发生次数增加，洪灾加重；水质污染极为严重。