Intraseasonal‐to‐Interannual Analysis of Discharge and Suspended Sediment Concentration Time‐Series of the Upper Changjiang (Yangtze River). Issue 8 (29th July 2021)

• Record Type: Journal Article
• Authors: Juez, C.; Garijo, N.; Hassan, M. A.; Nadal‐Romero, E.
• Is Part Of: Water resources research. Volume 57:Issue 8(2021)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2021-07-29
• Subjects: suspended sediment transport -- Changjiang (Yangtze River) -- long‐term databases -- erosion -- sediment fluxes -- multi‐scale wavelet analysis; Hydrology -- Periodicals; 333.91
• DOI: 10.1029/2020WR029457
• Languages: English
• ISSNs: 0043-1397

Abstract

Abstract: Sediment transport is the main driver of the channel morphology and landscape evolution, with implications for chemical and biological river processes, and human‐related activities. Understanding the processes governing the relations between discharge and suspended sediments is essential for the management of river catchments and river networks. Here, we use the method of wavelet transformation to identify the time‐scale dependency of suspended sediment patterns concerning the temporally and spatially uneven transient processes of sediment production, accumulation, and transport. We analyze the temporal variation of concurrent discharge and suspended sediment fluxes for the Upper Changjiang (Yangtze River, China) at Pingshan station by using a long‐term database collected for over 50 years. Furthermore, we bridge the limitations of pure predictive models to learn from temporal data structures with the main purpose of identifying the mechanisms underpinning the suspended sediment patterns (e.g., climatic forces). Intraseasonal‐to‐seasonal, annual, and inter‐annual dominant time‐scales are thus identified. The short time‐scales are driven by the bi‐modal seasonal precipitation pattern specific to the climate of the region and provide a continuous supply of sediments to the river. The large time‐scales, controlled by high magnitude flow events and within‐reach sediment storage, display alternating periods of increasing and decreasing sediment fluxes; ultimately, they maintain the river channel within balance or within a moderate positive sediment accumulation process. This analysis and methodology help to understand temporal sediment dynamics, and ultimately to manage river catchments. Key Points: Distinct time‐scales of discharge and suspended sediment concentration (SSC) are identified and related qualitatively to seasonal, annual, and short (1.1–5 years) and long‐term (5.5–20 years) variability Similar dominant time‐scales of variability for discharge and SSC are identified in the Upper Changjiang for a 50‐year study period Bi‐modal seasonal climatic pattern influence short‐term time‐scales whereas high magnitude flow events control intra‐annual time‐scales