Simulating of the Flood Runoff in Case of Heavy Rains in the Zone of Many-year Frozen Earths

Abstract

Special features of the rain floods runoff formation and an approach to their simulating for small catchments of the zone of many-year frozen earths’ spreading are discussed. Information about heavy rains and resulted floods obtained from the observation data from the experimental catchments of the Kolyma and Bomnak runoff stations has been used as initial data. On the basis of the available concepts of the many-year frozen earths’ active layer dynamics and the outcomes of the different years’ experimental investigations, a mathematical model has been proposed. It enables to take into consideration the accumulating role of the soil melted layer and the moss cover. The НЕС-HMS simulating system able to reproduce the flood runoff course with the 1 hour time discontinuity in specific conditions of slope regulation on the basis of the Clark unit hydrograph method was used to take in account special features of the rain runoff formation.