南水北调中线工程表面减阻降糙技术前期研究

重点研究南水北调中线工程表面减阻降糙技术措施，以降低长距离输水阻力，提高输水量。通过试验，原混凝土表面糙率为0．014，经过降糙处理后，糙率降至0．009，可明显提高输水量15％以上，同时，提高了混凝土表面强度、抗渗、抗冻、抗冲击（冰撞）、抗藻及抗霉菌等性能，避免引水过程中的二次污染，保障水质卫生安全且全面提升工程品质。通过研究可将减阻降糙处理工程造价控制在15元／m^2以下，以南水北调干线中线每年新增15亿m^3流量，运营按20年计，至少可带来300亿元收益。

Reducing Surface Resistance & Roughness-Coefficient Value of the Middle Route Project of the South-to-North Water Diversion

The test proves that the roughness-coefficient value reduced to 0.009 from original 0.014 by reducing resistance, increase 15% total amount of transporting water. In the meantime, the functions such as the strength of concrete surface, the ability of water-proofing, anti-frost, anti-impact (the ice bump), anti-moss and anti-fungi were improved. The research will reduce engineering cost by 15 Yuan /m2, to increase the amount of transporting water of the Middle Route Project of the South-North Water Diversion to 1,500 million liter annually, which can bring 30,000 million Yuan income at least.