74 / 2023-12-30 19:44:34

Modeling of hydrostatic ice generation and dissipation based on heat fluxes

static water ice; heat flux; numerical simulation; ice-water temperature chain; ice cover growth and disappearance

In order to study the influence mechanism of heat flux in the process of ice cover growth and ablation, a prototype test of static water ice growth and ablation with different time periods and water depths was carried out in a water pond at the Comprehensive Experimental Base of the College of Hydrology, Shenyang Agricultural University, Shenyang City, Liaoning Province, in the winter freezing period of 2023, and the changes of ice cover thickness, water temperature, ice temperature over time, solar radiation, and air temperature were obtained through experimental observations. Based on the analysis of the physical processes of ice formation and melting in the static water of the pond, a coupled model of the interaction between water temperature and ice cover growth and ablation was established. The results show that: air temperature is the main factor influencing the growth and melting of still-water ice cover, followed by solar radiation, and the diurnal cycle of the two significantly affects the thickness and temperature of the ice sheet; when the wind speed is lower than 3.5m/s, the ice surface temperature is synchronized with the change of air temperature, and the ice surface temperature is lower than the air temperature by 4℃ on average when the wind speed is higher than 3.5m/s; the ratio of the reflected solar radiation in the total solar radiation is different under the conditions of snow cover or no snow cover; the ratio is 20% when there is no snow cover; the ratio is 20% when there is no snow cover. 20% in the case of snow cover and 75% in the case of snow cover. Based on the existing HIGHTIS model, adding the environmental conditions and the atmosphere-ice cover-water body-pond bottom heat exchange formula, and simulating the water temperature and ice cover growth and ablation process, we found that the calculated values of ice thickness and water temperature basically match with the measured values, and the correlation coefficient is more than 0.86. This result can lay the foundation for the study of the changes in the production and consumption of the static water ice of small and medium-sized lakes and ponds, as well as the moving-water ice cover of rivers at a shallow water level.