The effect of sediment incipient motion characteristics on phosphorus concentration in water under the influence of xanthan

YAO Yinpeng; XU Chunyang; CHEN Yongping; ZHOU Chunyan

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YAO Yinpeng，XU Chunyang，CHEN Yongping, et al. The effect of sediment incipient motion characteristics on phosphorus concentration in water under the influence of xanthan[J]. Haiyang Xuebao，2025, 47(x)：1–10

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The effect of sediment incipient motion characteristics on phosphorus concentration in water under the influence of xanthan

YAO Yinpeng^{1, 2, 3
,},
XU Chunyang^{1, 2
,
,},
CHEN Yongping²,
ZHOU Chunyan²

1.
Jiangsu Key Laboratory of Coast Ocean Resources Development and Environment Security, Hohai University, Nanjing 210024, China
2.
College of Harbor, Coastal and Offshore Engineering, Hohai University, Nanjing 210024, China
3.
Shanghai Waterway Engineering Design and Consulting Co., Ltd., Shanghai 200120, China

Received Date: 2024-05-01
Rev Recd Date: 2024-08-12

Available Online: 2025-04-09

Abstract

Abstract

The transport of phosphorus by suspended sediment plays a pivotal role as a nutrient and ecological factor in aquatic environments, particularly in the complex hydrodynamic and sedimentary settings of Jiangsu's coastal tidal flats, where diverse organic coatings on sediment surfaces further complicate sediment dynamics. Investigating the impact of organic matter on both sediment transport and phosphorus adsorption processes, therefore, is crucial for predicting phosphorus dynamics in coastal tidal flats and nearshore waters. To elucidate the influence of organic matter content and sediment initiation characteristics on aqueous phosphorus concentrations, this study employs xanthan as a model organic substance. Through sediment initiation-resuspension-adsorption experiments and constant-temperature oscillation tests, the study systematically examines how xanthan alters sediment mobility and phosphorus adsorption under varying flow conditions. The research findings are as follows: 1) Xanthan significantly impedes the initiation of sediment motion from the bed, enhancing the bed's resistance to erosive shear stress by approximately twofold. 2) Sediment initiation characteristics act as a direct determinant in the adsorption of phosphorus by the bed sediment, a marked increase in aqueous phosphorus concentration is observed only after substantial sediment initiation commences. 3) While xanthan itself has negligible direct impact on phosphorus adsorption, it indirectly suppresses phosphorus adsorption by the bed sediment through inhibiting sediment initiation.
- fine sediment,
- hydrodynamic conditions,
- Xanthan,
- initiation,
- phosphorus

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References(32)

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