Gansu province lies on typical bess plateau, and highway is seriously destroyed bywater. How to study and explore highway washout and technology of prevention andcure systematically is very important.

• 甘肃地处典型的黄土高原，公路受水冲蚀破坏现象十分严重，如何系统地研究探讨公路冲蚀及防治技术就显得十分重要。