Abstract
A wide variety of river mouths has been established on the western coast of the Sea of Okhotsk; their variety is determined by the geomorphological features of the territory and a specific effect of high sea tides and active ice phenomena on their formation. Factors influencing the dynamics of the mouths under the combined effect of tides and ice are considered. It has been revealed that river ice is intensively deformed during tides and forms coastal ice barriers protecting steep river banks from erosion. Outside the channel, ice produces a significant exaration of the banks, thereby forming peculiar terrace-like surfaces along the rivers. The content of terrigenous material in ice has been quantitatively assessed by the layer-by-layer analysis of the content of inclusions, taking into account their uneven distribution in the ice core. The bulk of sediments in the Tugur River is deposited near its mouth in the southern part of the Tugur Bay. Under conditions of shallow depths at low tide, ice settles on the ground over a large area, thereby contributing to the inclusion of a significant mass of terrigenous material into the ground. Our research has shown that one of the main factors preventing the formation of a delta at the mouth of the Tugur River is the removal of influent suspended and bedload sediments by ice from the mouth zone of the receiving water body.
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Translated by D. Zabolotny
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Makhinov, A.N. Mouth Areas of Rivers on the Southwestern Coast of the Sea of Okhotsk and Role of Ice in the Formation of Their Channels under Conditions of High Tides. Water Resour 49, 860–868 (2022). https://doi.org/10.1134/S0097807822050104
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DOI: https://doi.org/10.1134/S0097807822050104