祁连山排露沟流域气温、冻土冻融与河川径流特征

doi:10.11707/j.1001-7488.20140105

Abstract

Abstract:

In this paper, the annual air temperature, sunshine duration, soil temperature, precipitation, soil freeze-thaw and river flow were analyzed based on data of monitoring meteorology, soil freezing and thawing, triangle weir hydrograph and volume from 2002 to 2011 in Pailugou watershed of Qilian Mountains. The results showed that: Average annual temperature was 1.7℃, and annual sunshine duration was 127.1 h. The soil temperature was 3.3℃ on the soil surface, 2.3℃ at 5, 10, and 15 cm depth, 2.4℃ at 20 and 40 cm depth. The soil freezing began around 11^th of October; the soil ablation finish was around 17^th of July. Frozen period was 278 days, accounted for 76.16% of a year. The rate of frozen soil thickness augment was about 1.22 cm ·d^-1 before the 10^th of December, then it reduced to 0.78 cm ·d^-1, and reached the minimum to 20^th of March, at which the thickness of frozen soil reached to the maximum, and the average maximum thickness was 159.6 cm; Soil thawing started around 2^nd of April with the increasing rate, and ended around 17^th of July, and the average melting rate was 1.47 cm ·d^-1. The regression model for S (runoff) and P (precipitation) was 2.936P + 9.587 (R²=0.742 6), and the regression model for S (runoff) and frozen-thaw thickness of soil was -10.361F_d + 1 388.498 (R²=0.701 7).

Key words: soil temperature, frozen soil freezing and thawing, river flow, Pailugou watershed of Qilian Mountains

CLC Number:

S719

Niu Yun, Liu Xiande, Jing Wenmao, Che Zongxi, Zhao Weijun. Characteristics of Temperature, Soil Freezing and Thawing, and River Flow in Pailugou Watershed of Qilian Mountains[J]. Scientia Silvae Sinicae, 2014, 50(1): 27-31.

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Characteristics of Temperature, Soil Freezing and Thawing, and River Flow in Pailugou Watershed of Qilian Mountains

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