Fundamental and Applied Hydrophysics最新文献_第7页

Suspended Particulate Matter Investigations by the Optical Method in the Franz-Victoria Trough, the Barents Sea 巴伦支海弗兰兹-维多利亚海槽中悬浮颗粒物的光学研究

Fundamental and Applied Hydrophysics Pub Date : 2022-10-10 DOI: 10.59887/fpg/76zt-4z7d-na73

A. S. Lokhov, M. Kravchishina, A. Klyuvitkin

引用次数: 0

V. Relationships Between Bio-Optical Parameters of the Black Sea Waters and Spectral Reflectance Coefficient in Spring 2019 五、2019年春季黑海水体生物光学参数与光谱反射系数的关系

Fundamental and Applied Hydrophysics Pub Date : 2022-10-09 DOI: 10.59887/fpg/47v1-8k56-g93n

E. Korchemkina, E. Mankovskaya

{"title":"V. Relationships Between Bio-Optical Parameters of the Black Sea Waters and Spectral Reflectance Coefficient in Spring 2019","authors":"E. Korchemkina, E. Mankovskaya","doi":"10.59887/fpg/47v1-8k56-g93n","DOIUrl":"https://doi.org/10.59887/fpg/47v1-8k56-g93n","url":null,"abstract":"The paper presents an analysis of field measurements of the spectral reflectance of the Black Sea and the bio-optical and colorimetric characteristics calculated from it, as well as chlorophyll concentrations and the Secchi disk depth. For the regions of the Black Sea with different characteristics, the averaged values of the calculated characteristics are presented: the effective and dominant wavelength in the reflectance spectrum, the purity of the water color. Using the previously developed bio-optical algorithm, the concentration of chlorophyll, absorption by dissolved organic matter, backscattering by suspended matter, and the vertical light attenuation coefficient were calculated.Inverse relationships are established between the Secchi disk depth and the maximum reflectance, as well as between the Secchi disk depth and the dominant wavelength. Linear relationships with high correlation coefficients are obtained between the surface chlorophyll concentration and the effective and dominant wavelength. A significant relationship was also established between the surface chlorophyll concentration and the maximum reflectance. Among the relationships between bio-optical and colorimetric parameters, a high correlation is observed between the vertical light attenuation coefficient and color purity.Chlorophyll concentrations calculated from the data of the spectral reflectance coefficient using a semi-analytical algorithm are in good agreement with the data of field measurements. Comparison of calculated and measured chlorophyll concentrations with satellite products of optical ocean color scanners shows an overestimation of chlorophyll concentrations by satellite data processing algorithms. The obtained correlations can be used in the future to assess bio-optical parameters in the northern part of the Black Sea.","PeriodicalId":218146,"journal":{"name":"Fundamental and Applied Hydrophysics","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134182565","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Complex Processing of Lidar Survey Data of Marine Areas 海洋区域激光雷达测量数据的复杂处理

Fundamental and Applied Hydrophysics Pub Date : 2022-10-09 DOI: 10.59887/fpg/26nu-3hte-3n48

V. A. Glukhov, Yu. A. Goldin, G. V. Zhegulin, M. A. Rodionov

{"title":"Complex Processing of Lidar Survey Data of Marine Areas","authors":"V. A. Glukhov, Yu. A. Goldin, G. V. Zhegulin, M. A. Rodionov","doi":"10.59887/fpg/26nu-3hte-3n48","DOIUrl":"https://doi.org/10.59887/fpg/26nu-3hte-3n48","url":null,"abstract":"The complex processing of data from the shipborne lidar survey of the Black Sea coastal areas was carried out. In this area, internal waves are often observed according to contact and satellite observations. The source of probing linearly polarized laser pulses in the lidar is a solid-state laser with diode pumping of the YAG: Nd active element with a pulse power of 20 mJ at a wavelength of 532 nm and a duration of 7 ns. The co- and cross-polarized components of the echo signal were recorded during the lidar survey. The cross-polarized component of the echo signal was mainly used due to its greater sensitivity to various kinds of inhomogeneities in the vertical distribution of hydrooptical characteristics. The purpose of processing is to identify quasi-periodic structures in the spatial distribution of the characteristics of lidar echo signals caused the propagation of short-period internal waves. Three processing methods were applied: the approximation method, the wavelet analysis method, and the Hilbert-Huang transform method. A large array of data obtained during 50 hours of lidar survey has been processed. Three 60-minute tracks containing quasi-periodic structures have been identified. The three processing methods results are in good agreement with each other and make it possible to obtain the most complete information about the parameters of the studied processes. The parameters of the recorded quasi-periodic processes are typical for internal waves observed in the coastal areas of the Black Sea. In the future, when processing a large amount of lidar sounding data, it is advisable to carry out fast processing by automated spectral methods at the first stage, and to carry out detailed processing by the approximation method only for those survey areas where quasi-periodic processes have been identified.","PeriodicalId":218146,"journal":{"name":"Fundamental and Applied Hydrophysics","volume":"77 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131852465","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Method for Fast Measuring of Seawater-Leaving Radiance Spectra 海水离开辐射光谱的快速测量方法

Fundamental and Applied Hydrophysics Pub Date : 2022-10-09 DOI: 10.59887/fpg/afm7-vh6d-r4a4

M. E. Lee, O. Martynov

{"title":"Method for Fast Measuring of Seawater-Leaving Radiance Spectra","authors":"M. E. Lee, O. Martynov","doi":"10.59887/fpg/afm7-vh6d-r4a4","DOIUrl":"https://doi.org/10.59887/fpg/afm7-vh6d-r4a4","url":null,"abstract":"It is noted that the high instrumental accuracy of modern marine spectrophotometers for reflectance measurements is difficult to implement due to large methodological errors caused by the sea surface waves by weather conditions and illumination geometry. A two-beam spectrophotometer based on the use of a multi-channel photomultiplier eliminating the disadvantages is proposed. The design and operation principle of a spectrophotometer, developed on the basis of a compact high-aperture monochromator and a photometric unit, in which the channels of the upwelling radiation and the irradiance of the sea surface are located, are described. In the instrument, instead of absolute measurements, the light fluxes are compared in a differential photometer instead of absolute measurements in order to reduce methodological errors. The use of a differential photometer, which measures the spectral reflectance of water, can significantly increase the measurement accuracy, because does not require absolute calibration of optical channels. The use of a multichannel photomultiplier leads to an additional decrease in methodological errors by reducing the time of measurements of the seawater spectral reflectance and makes it possible to select a sufficient number of spectra in a large volume of data without interference from waves and lighting conditions. The photomultiplier signals are digitized using a compact USB ADC/DAC module with digital input/output functions. Amplified signals from photocathodes are received at the module input, the module output is connected to the USB input of a computer recording signals and controlling the spectrophotometer work.","PeriodicalId":218146,"journal":{"name":"Fundamental and Applied Hydrophysics","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115507795","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of a Polydisperse Hydrosol on the Spectral Properties of Light Scattering by Seawater at Forfard Angles 多分散纯溶胶对海水前角光散射光谱特性的影响

Fundamental and Applied Hydrophysics Pub Date : 2022-10-09 DOI: 10.59887/fpg/41ha-gn1d-hxup

E. B. Shybanov, M. E. Lee

{"title":"Effect of a Polydisperse Hydrosol on the Spectral Properties of Light Scattering by Seawater at Forfard Angles","authors":"E. B. Shybanov, M. E. Lee","doi":"10.59887/fpg/41ha-gn1d-hxup","DOIUrl":"https://doi.org/10.59887/fpg/41ha-gn1d-hxup","url":null,"abstract":"In this paper we discuss the problem how to analyze the results of spectral volume scattering function measurements in natural waters and artificial ones. Analytical predictions and experimental proves of the remarkable changes in the properties of the light scattering at small angles after a filtration of water sample are presented. It was proposed that a certain correlations in the positions of scattering centers always exist in the water which were resulted in the volume scattering function of any natural water was strong forward peaked. Based on Mie theory the sums of scattering amplitudes and scattering radiances were calculated for a power-law particle size distribution while the maximal radius was varied. The square of the sum of the scattering amplitudes was compared with the value of the classical term. It is shown that in the “blue” a significant compensation of the effect of spatial correlation of particles occurs with an increasing of the maximum radius of particles, starting from the radius is about 0.2 μm. The contribution of the additional term decreases faster at general angles region. The spectral properties of light scattering by seawater during sequential filtration through nucleopore filters with a pore diameter of 2, 1, and 0.45 μm have been measured. The volume scattering function data at scattering angles from 6 to 90 degrees were analyzed. Water samples were taken from the surface of the Black Sea at the beginning of October. The Secchi depths are varied from 16 up to 19m. It was found that after filtration through a filter with pores diameter equaled to 1 μm, the typical deep at 30° of spectral slope of volume scattering function was appeared. Such deep becomes stronger after the next stage of filtration, when diameter of pores was equal to 0.45 µm. It is shown that the angular dependence of the exponent of the spectral slope obtained as a result of processing the experimental data is in consistent with theoretical predictions.","PeriodicalId":218146,"journal":{"name":"Fundamental and Applied Hydrophysics","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126619179","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Review of Oleg Viktorovich Kopelevich’s Works on Ocean Optics 奥列格·科佩列维奇海洋光学研究述评

Fundamental and Applied Hydrophysics Pub Date : 2022-10-09 DOI: 10.59887/fpg/vkp2-4p21-rtbh

D. Glukhovets, Yu. A. Goldin

{"title":"Review of Oleg Viktorovich Kopelevich’s Works on Ocean Optics","authors":"D. Glukhovets, Yu. A. Goldin","doi":"10.59887/fpg/vkp2-4p21-rtbh","DOIUrl":"https://doi.org/10.59887/fpg/vkp2-4p21-rtbh","url":null,"abstract":"The article is dedicated to the memory of Oleg Viktorovich Kopelevich, Doctor of Physical and Mathematical Sciences, who has been conducting research in the field of ocean optics for more than 50 years and has been the head of the Ocean Optics Laboratory of the Shirshov Institute of Oceanology for more than 30 years. The paper presents the main results obtained by Dr. Kopele-vich in different sections of ocean optics. At the first stage of his scientific activity, he was engaged in the study of light scattering in seawater. He identified four types of seawater scattering phase functions based on the results obtained in ocean expeditions. Subsequently, Dr. Kopelevich developed a low-parameter model of the seawater inherent optical properties. Since the late 1970s, an important place in his work has been the development of satellite methods for studying the ocean, in particular, the creation and improvement of regional bio-optical algorithms. The use of these algorithms for the waters of the Russian seas became the basis for the creation of the Atlas of their bio-optical characteristics, published regularly since 2002. The results of the use of regional algorithms were summed up in a collective monograph published in 2018. In addition, O. V. Kopelevich contributed to the study of light fields and the factors affecting them — cloud cover and mass phytoplankton blooms","PeriodicalId":218146,"journal":{"name":"Fundamental and Applied Hydrophysics","volume":"293 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127560845","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The Influence of Numerical Method and Grid Parameters on the Simulation Accuracy of Damped Oscillations of Free Floating Cylinder 数值方法和网格参数对自由浮动圆柱阻尼振动仿真精度的影响

Fundamental and Applied Hydrophysics Pub Date : 2022-06-25 DOI: 10.59887/fpg/kx4r-pr4d-fba8

K. Plygunova, A. Kozelkov, D. Strelets, D. Utkin, V. Kurulin

引用次数: 0

Three-Dimensional Hindcast of Nitrogen and Phosphorus Biogeochemical Dynamics in Lake Onego Ecosystem, 1985–2015. Part II: Seasonal Dynamics and Spatial Features; Integral Fluxes 1985-2015年奥涅戈湖生态系统氮磷生物地球化学动态三维反演第二部分:季节动态与空间特征;积分通量

Fundamental and Applied Hydrophysics Pub Date : 2022-06-25 DOI: 10.59887/fpg/9mg5-run6-4zr8

O. Savchuk, A. Isaev, N. Filatov

{"title":"Three-Dimensional Hindcast of Nitrogen and Phosphorus Biogeochemical Dynamics in Lake Onego Ecosystem, 1985–2015. Part II: Seasonal Dynamics and Spatial Features; Integral Fluxes","authors":"O. Savchuk, A. Isaev, N. Filatov","doi":"10.59887/fpg/9mg5-run6-4zr8","DOIUrl":"https://doi.org/10.59887/fpg/9mg5-run6-4zr8","url":null,"abstract":"A three-dimensional coupled hydrodynamical biogeochemical model of the nitrogen and phosphorus cycles has been used for a long-term reanalysis of the Lake Onego ecosystem. The comparison between simulation and sparse irregular observations, presented in the first part of this paper, demonstrated plausibility of the reconstructed temporal and spatial features of biogeochemical dynamics at a long-term scale, while seasonal dynamics of variables and fluxes are presented here. As new regional phonological knowledge, the reanalysis quantifies that the spring phytoplankton bloom, previously overlooked, reaches a maximum of 500 ± ± 128 mg C m–2 d–1 in May, contributes to approximately half of the lake’s annual primary production of 17.0–20.6 g C m–2 yr–1, and is triggered by increasing light availability rather than by an insignificant rise in water temperature. Coherent nutrient budgets provide reliable estimates of phosphorus and nitrogen residence times of 47 and 17 years, respectively. The shorter nitrogen residence time is explained by sediment denitrification, which in Lake Onego removes over 90 % of the bioavailable nitrogen input, but is often ignored in studies of other large lakes. An overall assessment of the model performance allows us considering the model a necessary and reliable tool for scenario simulations of possible changes in the Lake Onego ecosystem at the requested spatial and temporal scales.","PeriodicalId":218146,"journal":{"name":"Fundamental and Applied Hydrophysics","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125313845","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

The Relationship of the Spatial Structure of the Total Suspended Matter Concentration and Hydrological Parameters in the Northern Black Sea According to Contact Measurements 基于接触测量的黑海北部总悬浮物浓度空间结构与水文参数关系

Fundamental and Applied Hydrophysics Pub Date : 2022-06-25 DOI: 10.59887/fpg/4heu-kxbn-gg7t

A. A. Latushkin, Y. Artamonov, E. A. Skripaleva, A. V. Fedirko

{"title":"The Relationship of the Spatial Structure of the Total Suspended Matter Concentration and Hydrological Parameters in the Northern Black Sea According to Contact Measurements","authors":"A. A. Latushkin, Y. Artamonov, E. A. Skripaleva, A. V. Fedirko","doi":"10.59887/fpg/4heu-kxbn-gg7t","DOIUrl":"https://doi.org/10.59887/fpg/4heu-kxbn-gg7t","url":null,"abstract":"Here we describe the features of the horizontal and vertical distribution of total suspended matter in the northern part of the Black Sea and their relationships with the water temperature, salinity, and density fields measured at the identical grid during hydro-optical surveys from 2016 to 2020. The results show that the primary sources of increased total suspended matter concen trations in the northern part of the Black Sea are low-salinity and turbid waters of the Kerch Strait; runoffs of the Rioni, Enguri, and other rivers in the east of the survey area; together with freshened waters of the Dnieper, Dniester, and Danube runoff from the northwestern shelf. Higher turbidity was observed in the deep-water part of the sea, associated with the cyclonic gyres and meanders of the Rim Current effects. The total suspended matter vertical structure features an upper mixed layer, which usually coincides in thickness with the upper thermohaline upper mixed layer. Significant negative correlations were found for this layer comparing total suspended matter concentration versus temperature and salinity, while the correlation appears positive with density values. Below, a total suspended matter subsurface maximum was observed in the seasonal thermocline and pycnocline layer. The high turbidity layer appeared almost an order of magnitude thinner in the regions of maximum temperature gradients versus the areas where the temperature gradient was weak. A local total suspended matter minimum occurred below the cold intermediate core, corresponding to the main thermocline, halocline, and pycnocline layer. Beneath this minimum, there was a local increase of total suspended matter coinciding with the upper boundary of the hydrogen sulfide zone.","PeriodicalId":218146,"journal":{"name":"Fundamental and Applied Hydrophysics","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117022262","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Regime of Reservoir: Experience in Modeling Riverbed Processes with a Movable Bed 水库制度:用可动河床模拟河床过程的经验

Fundamental and Applied Hydrophysics Pub Date : 2022-06-25 DOI: 10.59887/fpg/peru-3z3h-gazh

A. V. Rakhuba, M. Shmakova

{"title":"Regime of Reservoir: Experience in Modeling Riverbed Processes with a Movable Bed","authors":"A. V. Rakhuba, M. Shmakova","doi":"10.59887/fpg/peru-3z3h-gazh","DOIUrl":"https://doi.org/10.59887/fpg/peru-3z3h-gazh","url":null,"abstract":"The paper presents the results of the interrelated calculation of the unsteady uneven movement of the river flow and the re-formation of the bottom of the largest flowing Kuibyshev reservoir in Eurasia in different phases of water content. These calculations are based on the hydrodynamic model “Wave” and algorithms for calculating solid runoff (analytical formula for sediment flow rate), changes in the transport potential of the flow and, as a result of the latter, changes in the bottom marks. In this case, the dynamics of the bottom marks is taken into account in subsequent calculations and is one of the arguments of the model. Based on the model calculations, the spatial distribution of bottom sediments in the water area of the reservoir was investigated and maps of accumulation and erosion of the bed in different phases of water content were constructed. It is shown that for the entire calculation period, an uneven redistribution of sediments in the reservoir is observed: erosion occurs in the upper part, and accumulation occurs in the middle and lower parts. In general, for the Kuibyshev reservoir, the contribution to siltation only by river sediment is insignificant. On average, over the 150-day modeling period for the entire reservoir water area, sediment accumulation is 0.5 mm/period. The weak dynamics of currents in the vast water area of the reservoir reaches does not contribute to active channel transformations. The most intensive processes of bottom transformation occur in places of narrowing of the water area, where the contribution of the non-stationary regime to the formation of the bottom relief during the rise and fall of the flood is best expressed. More full-flowing years will also lead to a more intensive redistribution of solid runoff and bottom sediments coming from the upper strata.","PeriodicalId":218146,"journal":{"name":"Fundamental and Applied Hydrophysics","volume":"117 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124145330","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1