河流纵剖面陡峭指数对庐山构造抬升的指示

doi:10.11821/dlxb201509013

Abstract

Abstract:

In this study, we extracted nine river profiles from a 5-m DEM of the Mt. Lushan region. Knickpoints of two types, namely the vertical-step knickpoint and the slope-break knickpoint, are recognized, and are compared with the geological settings to determine their origins. At the same time, we calculated the channel steepness index (k_sn) and concavity (θ) of separated parts of these rivers, using the stream-power incision model. The results show that these rivers are almost in a transient state represented by the occurrence of knickpoints. The vertical-step knickpoints are related to inhomogeneous substrates and the slope-break knickpoints are ascribed to the lowering of the base level due to rapid mountain uplift. The parts of the rivers below the slope-break knickpoint have a relatively large k_sn, which probably indicates a shift from low rate at early uplift to a later high rate. The steepness index in the south of the mountain is larger than that in the north, which might be induced by different uplift rates or substrates.

Key words: Lushan, stream-power incision model, normalized channel steepness index, tectonic uplift, knickpoint

Nairui WANG, Zhiyong HAN, Xusheng LI, Gang CHEN, Xianyan WANG, Huayu LU. Tectonic uplift of Mt. Lushan indicated by the steepness indices of the river longitudinal profiles[J].Acta Geographica Sinica, 2015, 70(9): 1516-1525.

Figures/Tables 5

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流域编号	流域名称	河流长度(km)	流域面积(km²)	拟合河段	k_sn(m^0.9）	凹曲度
R1	庐山垄	14	38	S1	27	0.42
R1	庐山垄	14	38	S2	168	0.55
R2	青玉峡	5	5	-	-	-
R3	三峡涧	12	42	S1	9	0.37
R3	三峡涧	12	42	S2	169	0.51
R4	七里冲	11	19	-	-	-
R5	白沙河	10	29	S1	9	0.20
R5	白沙河	10	29	S2	117	0.24
R6	定慧寺	9	20	S1	93	0.19
R7	剪刀峡	10	14	S1	15	0.49
R7	剪刀峡	10	14	S2	143	0.42
R8	石门涧	13	30	-	-	-
R9	黄龙庵	8	13	-	-	-

Tectonic uplift of Mt. Lushan indicated by the steepness indices of the river longitudinal profiles

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