Effect of wind on ice pressure on river structures

Conclusions

• 1. The role of the wind factor in the formation of ice pressure on structures depends on the relation between the wind speed and current velocity. Thus, for ratios (w/v)<10 characteristic for free rivers and relatively shallow impounded pools it is small and it can be neglected in engineering calculations; for large ratios (w/v)>100 characteristic for large reservoirs the wind has a decisive effect on the extent of the ice loads in the period of the spring ice run. In the intermediate range of w/v ratios the effect of the wind is commensurable with the effect of the stream.

• 2. For small w/v ratios it is advisable to use equations of the type derived in [4] for calculating the ice loads, and for ratios (w/v)>10 for shallow pools and (w/v)<100 for deep pools, when not one of the main factors of the ambient medium of the ice can be neglected; in these equations is is necessary to replace M₁=(v/C_1im)² by M₂=(v/C_1im)²A[1+ N(w/v)²]. When (w/v)>100 in the case of deep reservoirs it is advisable to use the reduced equations of the type derived in this article.