The Quantitative Model Research of Impact of Water Level Changes on Channel Capacity

Water level determines channel capacity, in order to protect the safety of navigation and give full play to the advantages of shipping, the paper analyzes the relationship between the draft and loading rate of various types of ships, and proposed the quantitative model of impact of water level changes on channel capacity, the results showed: small ships are less affected by water level changes, and large ships are great affected by water level changes, the actual amount of cargo related the ship design parameters, this article has a certain reference value for navigation management and planning.

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Sedimentary Cladocera as indicators of past water-level changes in shallow northern lakes

Quaternary Research ◽

10.1016/j.yqres.2011.02.007 ◽

2011 ◽

Vol 75 (3) ◽

pp. 430-437 ◽

Cited By ~ 33

Author(s):

Liisa Nevalainen ◽

Kaarina Sarmaja-Korjonen ◽

Tomi P. Luoto

Keyword(s):

Water Level ◽

Lake Level ◽

Water Levels ◽

Sediment Record ◽

Inference Model ◽

Water Level Changes ◽

Long Term Changes ◽

Lower Water Level ◽

The Relationship

AbstractThe usability of subfossil Cladocera assemblages in reconstructing long-term changes in lake level was examined by testing the relationship between Cladocera-based planktonic/littoral (P/L) ratio and water-level inference model in a surface-sediment dataset and in a 2000-yr sediment record in Finland. The relationships between measured and inferred water levels and P/L ratios were significant in the dataset, implying that littoral taxa are primarily deposited in shallow littoral areas, while planktonic cladocerans accumulate abundantly mainly in deepwater locations. The 2000-yr water-level reconstructions based on the water-level inference model and P/L ratio corresponded closely with each other and with a previously available midge-inferred water-level reconstruction from the same core, showing a period of lower water level around AD 300–1000 and suggesting that the methods are valid for paleolimnological and -climatological use.

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Relationship between Earthquake-Induced Hydrologic Changes and Faults

Water ◽

10.3390/w13192795 ◽

2021 ◽

Vol 13 (19) ◽

pp. 2795

Author(s):

Yuchuan Ma ◽

Guangcai Wang ◽

Rui Yan ◽

Bo Wang ◽

Huaizhong Yu ◽

...

Keyword(s):

Water Level ◽

Seismic Waves ◽

Damage Zone ◽

The Other ◽

Storage Coefficient ◽

Water Level Changes ◽

Pressure Development ◽

Fault Damage Zone ◽

The Relationship ◽

And Storage

Hydraulic properties of fault zones are important to understanding the pore pressure development and fault stability. In this work, we examined the relationship between water level changes caused by the 2008 Wenchuan Mw 7.9 earthquake and faults using four wells with the same lithology around the Three Gorges Dam, China. Two of the wells penetrating the fault damage zones recorded sustained water level changes, while the other two wells that are not penetrating any fault damage zones recorded transient water level changes. The phase shift and tidal factor calculated from water level, a proxy of permeability and storage coefficient, revealed that both the permeability and storage coefficient changed in the two wells penetrating the fault damage zones, while the other two wells not penetrating the fault damage zone did not show any change in permeability and storage coefficient. Thus, we tentatively suggest that faults may play an important controlling role on earthquake-induced hydrologic changes because the detrital or clogging components in the fractures may be more easily removed by seismic waves.

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