Оценка максимального стока рек прибрежной территории Приморского края в связи с опасностью наводнений

Abstract

The temporal patterns and spatial features of the maximum runoff in the coastal territory of Primorsky Region in view of the floods hazard for the period from the beginning of observations to 2018, are considered. The indicator of exceeding the hazardous water level, determined by the territorial divisions of the Hydrometeorology Department of the Russian Federation, used as a criterion for identifying the most flood-prone areas. Except for the Kazachka river, all the considered watercourses are characterized by the predominance of supreme value of runoff in summer-autumn season. There is no dependence between the amplitudes of intra-annual average daily, inter-annual fluctuations of the maximum water levels and the morphometric characteristics of catchments for the rivers on the coast of Primorsky Region. But generally it is obvious that amplitudes grow with increasing a river size. The temporal dynamics of the absolute values of the maximum runoff, its anomalies and long-term water cycles of the rivers in the coastal zone of Primorsky Region are not synchronous, except for a group of neighboring rivers on the east coast, as well as the Razdolnaya river in three gaging stations. The rivers of the coast region are characterized by a complex spatial differentiation of hazardous phenomena associated with high water levels. Their recurrence differs on closely located rivers. An increase in the frequency of floods in recent years has been observed only on certain rivers as the Razdolnaya river at Novogeorgievka settlement and the Rakovka river at Opyitny settlement. The territories of the catchments of the Razdolnaya, Borisovka and Tsukanovka rivers are exposed to the greatest threats of exceeding the hazardous water levels