arXiv subjects

Liu Kejing

Publications and source records attributed to Liu Kejing.

3 recordsLinked to original sources

arXiv2026

The influence of Coriolis force on sedimentation of the Yellow River

In the northern hemisphere, river subjects the right bank to the pressure generated by the Coriolis force, which will increase the erosion of the river on the right bank. On the other hand, the Coriolis force also causes the sediments in the water to move to the right bank, which will increase the sediment deposition on the right bank of the river. Therefore, for rivers with low sediment content, Coriolis force will increase the erosion of river water on the right bank; for rivers with high sediment content, Coriolis force will increase the sedimentation of sediment on the right bank. It is noted that the Lanzhou section of the Yellow River has siltation of sands and pebbles to the right (south) bank. It is believed that this is caused by the Coriolis force moving the sands and pebbles to the right bank.

physics.geo-ph↗

arXiv2026

How oil slicks floating on the ocean affect SST?

Oil slicks are widely distributed in the ocean today, as a kind of coverage on sea surface, they became a part of ocean environment and affect their surroundings. A stochastic-dynamic theoretical model proposed in this work to illustrate how oil slicks affect global climate from micro scale relation between a piece of oil slick and sea surface temperature (SST) of its surrounding unit area, for SST is an important index of global climate. The model indicate that oil slicks make the sea surface warmer in the future, and the temperature series of the sea surface covered by oil slicks will have greater variance and fatter tails for its distribution and reduce SST predictability from a microcosmic perspective. Thus, more oil infused into the ocean makes the air-sea system more uncertain. These findings indicate that the present air-sea coupled models may lack of sufficient attention to oil slicks floating on the sea surface.

physics.geo-ph↗

arXiv2026

The Statistical Mechanical Model of Sediment Transport Capacity and Scour-and-Silt volume in Wide and Shallow Rivers

This study aims to develop a universal, parameter-free model for sediment transport and riverbed evolution using a rigorous statistical physics framework. It seeks to overcome the limitations of traditional deterministic and empirical approaches by establishing formulas with general applicability. The river channel is conceptualized as an isothermal-isobaric ensemble containing numerous non-identical sediment particles. The macroscopic state of the system, defined by the scour-and-silt volume, is derived from the statistical mechanics of particle distributions. The Gibbs free energy and partition function for the ensemble are formulated, considering the two primary states of particles (suspended load and bed load) and the transitions between them. This theoretical framework yields a universal formula for the number of particles in transport and the consequent volumetric change. The model was applied to six reaches of the Lower Yellow River from 2000-2001. Calculations revealed a seasonal pattern in the number of transported particles, higher in winter and lower in summer. The results showed an alternation between scour (January-July) and siltation (July-January), with a net scour volume over the 24-month period. The magnitude of scour-and-silt volume decreased from upstream to downstream, findings that are consistent with independent observational records following the operation of the Xiaolangdi Reservoir. The model successfully simulates riverbed evolution without empirical parameters, demonstrating that statistical physics provides a robust framework for predicting complex fluvial processes. Its general formulation suggests potential applicability to other similar multi-particle systems.

physics.geo-ph↗