【摘 要】
：
Velocity vertical profiles in the bottom boundary layer are important to understand the oceanic circulation.The logarithmic vertical profile,u=Alnz+B,is the universal profile for the horizontal velocity in the boundary layer,in which two coefficients (A a
【机 构】
：
School of Marine Sciences,Nanjing University of Information Science and Technology,Nanjing 210044,Ch
论文部分内容阅读
Velocity vertical profiles in the bottom boundary layer are important to understand the oceanic circulation.The logarithmic vertical profile,u=Alnz+B,is the universal profile for the horizontal velocity in the boundary layer,in which two coefficients (A and B) need to be determined.The two coefficients are the functions of the friction velocity (u.) and the roughness length (z0),and they are calculated using u.and z0.However,the measurement of u* and z0 is a challenge.In the present study,an approach is developed to estimate the two coefficients (A and B) by using a series of flume laboratory experiments with flat boundary and regularly distributed cylinders as the rough boundaries.An acoustic doppler velocimeter (ADV) is used to measure the velocity vertical profiles of the steady flow.Using the measured velocity data,the regressed logarithmic profiles are obtained.Based on the series of the A and B values,the mathematical formula forA and B are statistically established as the function of the cylinder height,inflow velocity,and the water depth,which avoids the measurement of the friction velocity and the roughness length.
其他文献
Conspecific seagrass living in differing environments may develop different root system acclimation patterns.We applied X-ray computed tomography (CT) for imaging and quantifying roots systems of Zostera japonica collected from typical oligotrophic and eu
The spatial distribution of the forward-propagating amplified spontaneous emission[ASE]of nitrogen molecular ions during femtosecond laser filamentation in air is studied via numerical simulations.The results suggest that the divergence angle and signal i
The distributed optical fiber surface plasmon resonance[SPR]sensors have attracted wide attention in biosensing and chemical sensing applications.However,due to the limitation of their sensing structure,it is difficult to adjust their res-onant wavelength
Magnetotactic bacteria (MTB) are a group of microorganisms capable of orientating and swimming along magnetic fields because they contain intracellular biomineralized magnetosomes composed of magnetite (Fe3O4) or/and greigite (Fe3S4).They are ubiquitous i
Sea cucumbers are echinoderm species with a leathery skin and an elongated body.Natural compounds,including saponins,have been previously isolated from sea cucumber.The majority of saponins derived from this organism typically belong to the triterpene gly
Marine ranching can be regarded as a type of artificial fishery,and its construction aims at the sustainable utilisation of fishery resources.Therefore,the sustainable yield level of target species in marine ranching has become one of the concerns of stak
To overcome the capacity crunch of optical communications based on the traditional single-mode fiber[SMF],different modes in a few-mode fiber[FMF]can be employed for mode division multiplexing[MDM].MDM can also be extended to photonic integration for obta
Magnetotactic bacteria (MTB),ubiquitous in soil and fresh and saltwater sources have been identified in the microbiome of humans and many animals.MTB endogenously produce magnetic nanocrystals enabling them to orient and navigate along geomagnetic fields.
Seahorses have evolved many unique biological traits,including a male brood pouch,the absence of caudal and pelvic fins,and the lack of spleen and gut-associated lymphatic tissue.The mitogen-activated protein kinases (MAPKs) are known to be involved in va
Magnetotactic bacteria can orientate in the Earth\'s magnetic field to search for their preferred microoxic environments,which is achieved by their unique organelles,the magnetosomes.Magnetosomes contain nanometer-sized crystal particles of magnetic iro