Multiple temporal scale relationships of bankfull discharge with streamflow and sediment transport in the Yellow River in China |
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| Authors: | Yan-yan ZHANG De-yu ZHONG Bao-sheng WU |
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| Institution: | [1]State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing 100084, China [2]Pearl River Hydraulic Research Institute, Pearl River Water Resources Commission, Guangzhou 510611, China |
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| Abstract: | This paper presents a study on the characteristics of multiple time scales of bankfull discharge and its delayed response to changes of flow conditions using continuous wavelet analysis for data from selected hydrological stations in the Yellow River basin. Results showed that bankfull discharge series had one or two dominant time scales. For example, the Huayuankou station in the lower reach of the Yellow River had two dominant time scales of 19–20 years and 5–6 years. The dominant time scales of the bankfull discharge series were generally consistent with the dominant time scales of water discharge and sediment concentration series, indicating that the channel morphology inherits the characteristics of the hydrological system in terms of multiple time scales. In addition, the wavelet coefficients of the bankfull discharge series had a phase difference in relation to those of the sediment concentration series, with a delay time that varied from 3 to 16 years at different sites. This delay time or relaxation time is a result of the delayed response of bankfull discharge to flow conditions, which was significant for channel adjustments in response to changes of flow conditions. The findings of the multiple time scales and the delayed response are of importance for further study of channel morphology of fluvial systems. |
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| Keywords: | Multiple time scales wavelet analysis bankfull discharge river morphology fluvial processes Yellow River |
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