Influence of Recession of Irrigated Area in Ningxia to the Ice Run Control Regulation during Freezing Period of the Yellow River
The paper analyzes the laws of diversion and recession of Ningxia irrigated area in 1991 to 2008 and the influence of recession of winter irrigation to the ice run control and regulation of Ningxia-Inner Mongolia Section.The outcomes show that the recession process lags diversion process and the tendencies of variation are similar,concentrating in the periods of May-August and November.The volume of recession of the two periods makes up 94% of the annual total and the recession is related to precipitation,groundwater level and evaporation of the area.It finds out through the analysis on recession law of winter irrigation that the influence of recession to 10-15 day ice run regime of continuous ice flowing of Ningxia-Inner Mongolia Section is smaller,but the danger caused by quick freezing after strong cold current happened in the early and middle November is greater.
The paper introducess the implemented conditions which colling recycle of flexible base on Ying-DaLine.It over all xpounds the investigation of road condlitions of original pavement,indoor trial study,determination of trial lot plan as well as completion of trial lot etc.