Silt deposition occurs in the downstream approach channel of the tidal lock as in a closed channel or excavated dock basin. It is often difficult to calculate or predict siltation because of complex flow and sediment ...Silt deposition occurs in the downstream approach channel of the tidal lock as in a closed channel or excavated dock basin. It is often difficult to calculate or predict siltation because of complex flow and sediment conditions and many other affecting factors. In this paper, the characteristics of flow movement in the approach channel (including its mouth) of the tidal lock are analyzed, the basic laws of sediment movement and siltation mechanism are investigated, the conditions for three types of siltation (circumfluence siltation, density flow siltation and slow flow siltation) are discussed, and corresponding calculating formulas are proposed. A practical example shows that the difference between measured and calculated results is small, indicating that the present calculating methods could be used in design and management of practical engineering projects.展开更多
Due to tidal locking in the Earth-Moon system,the Moon’s farside remained enigmatic until Luna 3 captured its first image,unveiling a rugged landscape largely devoid of extensive dark regions(i.e.,maria),which,by con...Due to tidal locking in the Earth-Moon system,the Moon’s farside remained enigmatic until Luna 3 captured its first image,unveiling a rugged landscape largely devoid of extensive dark regions(i.e.,maria),which,by contrast,cover a substantial fraction on the Earth-facing nearside.Subsequent orbital missions further revealed remarkable hemispherical differences:the nearside exhibits more intense volcanic activity.展开更多
文摘Silt deposition occurs in the downstream approach channel of the tidal lock as in a closed channel or excavated dock basin. It is often difficult to calculate or predict siltation because of complex flow and sediment conditions and many other affecting factors. In this paper, the characteristics of flow movement in the approach channel (including its mouth) of the tidal lock are analyzed, the basic laws of sediment movement and siltation mechanism are investigated, the conditions for three types of siltation (circumfluence siltation, density flow siltation and slow flow siltation) are discussed, and corresponding calculating formulas are proposed. A practical example shows that the difference between measured and calculated results is small, indicating that the present calculating methods could be used in design and management of practical engineering projects.
基金supported by the National Natural Science Foundation of China(42122019)the Fundamental Research Funds for the Central Universities(2652023001 and 3-7-5-2019-07)the State Key Laboratory of Geological Processes and Mineral Resources。
文摘Due to tidal locking in the Earth-Moon system,the Moon’s farside remained enigmatic until Luna 3 captured its first image,unveiling a rugged landscape largely devoid of extensive dark regions(i.e.,maria),which,by contrast,cover a substantial fraction on the Earth-facing nearside.Subsequent orbital missions further revealed remarkable hemispherical differences:the nearside exhibits more intense volcanic activity.
