DRY AND WET STATE DISCRIMINATION AND THE APPLICATION OF WATER/SNOW ACCUMULATION MODEL ON THE ROAD SURFACE OF EXPRESSWAY
LI Ying-xia
JIAO Sheng-ming
BAO Yun-xuan
YUAN Cheng-song
ZHU Yue-ying
XIE Xiao-jin
WANG Lin
Abstract：In order to ascertain the process of road water (or snow) accumulation,the change of road surface dry-wet conditions and the influence of meteorological factors on them,in this paper,a series of the observed data on the process of road water (or snow) accumulation and the records of road surface dry-wet condition change at Jintan Experimental Base was used as the input data of the modified Sass model,a physical model initially only for the calculation of water accumulation on road surface,was modified to be applicable for the quantitative calculation of the water and snow accumulation on the road surface of an expressway by the change of some physical parameters.This model was used to the simulations of road surface water (snow) accumulation for two rainfall processes and a snowfall process in this paper.Based on the classification on the simulation results and the comparisons between the classification data,the records of automatic instruments and the artificial observations,the accuracy of the model on the simulations of road surface dry-wetconditions was verified and the influence of the meteorological factors on the road surface water (snow) accumulation was discussed.The results showed as follows:(1) The modified Sass model was applicable to the simulation of road surface dry-wet condition with a high accuracy and it can be popularized and applied to the real-time monitoring and forecasting of road surface condition on an expressway.(2) In the process of water drainage on the road surface,the difference between the contribution rate of runoff and the contribution rate of evaporation was great in different periods.In terms of total quantity,the runoff played a main role on drainage.(3) The influence of meteorological factors on the road surface water (snow) accumulation was,reflected on the direct impact of rainfall(snowfall) in the road surface water (snow) accumulation but the other meteorological factors had relative indirect impacts on the road condition through the effects of evaporation.
Keywords：model of road surface water (snow) accumulationevaporationrunoffmeteorological factorsroad surface dry-wet conditioncontribution date on drainage
Publication Date：2017-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：10( 558-567 )