Analysis of the formation mechanism and environmental effects of Tianchi Lake in Wenxian, Gansu Province
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Abstract:
The geological formation mechanism of permanent barrier lakes in carbonate areas is rarely studied. Systematic analysis is also lacking on the environmental effects of such barrier lakes in arid areas. Their geological fo rmation mechanism has theoretical and practical significance, but the mechanism is not very clearyet. Using detailed field surveys and C14 dating method, we conducted anin-depth study on the formation mechanism and environmental effects of Tianchi Barrier Lake in Wenxian County. The results showed that Tianchi Lake was formed when a strong earthquake struck the Tianchi region (6450±73) years ago, causing two high landslides in the right bank and left bank of Tiachi valley at the sametime, blocking the Tianchi valley . The "inverse grading structure feature" of the landslide deposit causes the particle size structure of the landslide dam material to show the features of"smaller below and larger above" and "smaller in the middle and larger on the sides" . This is the reason why the Tianchi Barrier Lake can stand long, becoming a natural reservoir, forming a unique microclimate, and generating a very rich, varied, and heterogeneous landscape type. The long existence of Tianchi Barrier Lake accelerated the erosion rate down the landslide dam, controlled the undercutting in the lake area, and had little effect on the undercut rate of the valley in the upper reaches of the lake, forming clearly contrasting landforms.
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