NUMERICAL SIMULATION OF CHANGES IN THE THERMAL CONDITION OF SOILS UNDER THE EFFECT OF CHANNEL CHANGE OF A RIVER BED

摘要

In order to develop the first seam at the Tataurovsk brown coal field, the bed of the Ingoda River running under the would-be mining site has to be diverted. It was decided to build a change channel. The width of the main bed at the working site is 100- 150 m, the depth is 0.5- 1.2 m, the reaches are 3 - 4 m, and the average rate of flow measured in many years is 64.1 m~3/sec. Since the site is located in the south part of a cryolite zone, building of the channel should inevitably change the thermal condition of the soils. We can expect shifting of the upper boundary of the permafrost. After the removal of the warming influence of water, the top of the permafrost in the region of the old bed should move upward, and under the new bed it should go below the initial level due to uncovering of congelation and temperature effect. We evaluated the effect of the change channel on the soil temperature. As a result of analytical prediction of ther-modynamic processes we obtained curves of temperature distribution in soils in the region of the channel in different periods of digging and filling of the channel bed.