Scientific Review Engineering and Environmental Sciences (SREES)最新文献_第3页

Spatial mapping of the leaf area index using remote sensing and ground measurements – the Biebrza National Park case study 利用遥感和地面测量的叶面积指数空间制图——Biebrza国家公园案例研究

Scientific Review Engineering and Environmental Sciences (SREES) Pub Date : 2023-06-02 DOI: 10.22630/srees.4889

S. Ignar, Sylwia Szporak-Wasilewska, Małgorzata Gregorczyk

{"title":"Spatial mapping of the leaf area index using remote sensing and ground measurements – the Biebrza National Park case study","authors":"S. Ignar, Sylwia Szporak-Wasilewska, Małgorzata Gregorczyk","doi":"10.22630/srees.4889","DOIUrl":"https://doi.org/10.22630/srees.4889","url":null,"abstract":"The purpose of the described research was an attempt to estimate the leaf area index (LAI) parameter describing the structure of the vegetation based on the Landsat 5TM satellite imagery and field measurements made with the use of an optical plant canopy analyzer. The study was carried out in north-eastern Poland in the Biebrza river valley within the boundaries of the Biebrza National Park during the growing season of the year 2007. There were 13 spectral indices given in the literature known to be correlated with the LAI. The highest coefficient of determination and the highest correlation coefficient were obtained for the normalized difference vegetation index (NDVI) and the soil adjusted vegetation index (SAVI) indices for the wetland areas in the Biebrza river valley. The field measurements of the leaf area index and its spatial representation on satellite image show that the vegetation of natural river valleys is characterized by high spatial and seasonal variability. The study of the LAI on such large natural areas that are extensively used also requires knowledge of the methods of land use and the application of individual agrotechnical measures.","PeriodicalId":201498,"journal":{"name":"Scientific Review Engineering and Environmental Sciences (SREES)","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122049861","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

Simulation of laminar flow passing through a T-splitter plate and bridge pier 通过t型分流板和桥墩的层流模拟

Scientific Review Engineering and Environmental Sciences (SREES) Pub Date : 2023-05-10 DOI: 10.22630/srees.4548

Rafi M. Qasim, T. Jabbar, S. Faisal

{"title":"Simulation of laminar flow passing through a T-splitter plate and bridge pier","authors":"Rafi M. Qasim, T. Jabbar, S. Faisal","doi":"10.22630/srees.4548","DOIUrl":"https://doi.org/10.22630/srees.4548","url":null,"abstract":"The present analysis focuses on the investigation of the two-dimensional flow passing a bridge pier nearby a splitter plate in different regimes of a laminar flow. The splitter plate is T-shaped and two different cases have been studied based on the form of the splitter plate relative to the bridge pier. The analysis is implemented for steady and incompressible water flow in an open channel. The current study deals with velocity vectors, drag coefficients, lift coefficients, and skin friction. The analysis of the velocity vector gave a good indicator about the separation process and dissipation, which occurs at the splitter plate before the occurrence of these processes at the front face of the pier, especially the flow separation process. Moreover, the velocity vector gave a good image about the flow direction at two regions, the first region is located between the rear portion of the splitter plate and the frontal face of the pier, while the second region is the wake region, which is located at the downstream of the pier. Negative drag coefficient, lift coefficient, and skin friction coefficient values are obtained from the analysis. This happens due to the existence of the splitter plate that leads to the reduction of these values.","PeriodicalId":201498,"journal":{"name":"Scientific Review Engineering and Environmental Sciences (SREES)","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128317436","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

Residual strength and toughness after impact loading for RC slabs strengthened with different layers of geogrid 不同层数土工格栅加固RC板冲击后的剩余强度和韧性

Scientific Review Engineering and Environmental Sciences (SREES) Pub Date : 2023-05-10 DOI: 10.22630/srees.4768

Aya M. E. AHMED, Osman Hamdy, Youssef L. Z. SAAD, Seleem S. E. AHMAD

{"title":"Residual strength and toughness after impact loading for RC slabs strengthened with different layers of geogrid","authors":"Aya M. E. AHMED, Osman Hamdy, Youssef L. Z. SAAD, Seleem S. E. AHMAD","doi":"10.22630/srees.4768","DOIUrl":"https://doi.org/10.22630/srees.4768","url":null,"abstract":"This study presents an experiment for investigating the residual strength and toughness of reinforced concrete, RC, and slab reinforced by a geogrid as shrinkage reinforcement along with lower tensile steel reinforcement. Three different parameters were considered, slab thickness, number of geogrid layers, and thickness of the upper concrete cover. Fifteen slab samples with sizes of 50 × 50 cm exposed to the impact load on its center before being re-load by the static load and six slab samples exposed to the static load only. The load and deflection relation were recorded through the static loading process for all specimens, where loading capacity, toughness, and toughness index were measured. The results show an enhancement in the slabs residual strength as the slab thickness and concrete cover increased. On the other hand, the residual strength of slabs has a remarkable decrease with the increase in geogrid layers. Moreover, the toughness has a positive relationship with the concrete cover and has an inverse relation with the slab thickness and the number of layers. A geogrid reduced the number and distribution of cracks and mitigated their severity, especially for double layers with the same concrete cover.","PeriodicalId":201498,"journal":{"name":"Scientific Review Engineering and Environmental Sciences (SREES)","volume":"540 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123115062","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

Analysis of tariff adjustment for clean water usage 清洁用水收费调整分析

Scientific Review Engineering and Environmental Sciences (SREES) Pub Date : 2023-04-28 DOI: 10.22630/srees.4790

Heni Fitriani, M. A. Kurniawan, Febrian Hadinata

引用次数: 0

Behavior study of the steel plate girder with a cellular honeycomb web 带蜂窝腹板的钢板梁性能研究

Scientific Review Engineering and Environmental Sciences (SREES) Pub Date : 2023-04-28 DOI: 10.22630/srees.4743

H. Ammash, Noora N. Shaffaf

{"title":"Behavior study of the steel plate girder with a cellular honeycomb web","authors":"H. Ammash, Noora N. Shaffaf","doi":"10.22630/srees.4743","DOIUrl":"https://doi.org/10.22630/srees.4743","url":null,"abstract":"Based on the experimental test results of the authors, this investigation is concerned with the finite element analysis to examine and compare the load values and failure modes of the authors’ results. This research was conducted using the Abaqus software. The experimental work included the fabrication of twelve plate girders with honeycomb and flat web plate corrugation patterns, which were then tested under a single concentrated load at the midspan. According to the corrugation dimension or outer honeycomb web thickness, the honeycomb steel plate web girder is divided into three groups (60 mm, 80 mm and 100 mm). The specimens also involved plate girders with a flat web. The specimens were created with three lengths (600 mm, 1,200 mm and 1,800 mm). The Abaqus software was used in finite element models to simulate the concentrated load. The numerical results demonstrated that the 60 mm thick honeycomb web provides a greater load-bearing capacity and shear strength than other girders. The 20 mm honeycomb corrugation on the steel plate girder indicates the increased and improved shear resistance. The conclusion was that as the width of the corrugation increased, so did the steel web’s ultimate load and shear strength, resulting in a positive relationship between the critical shear buckling load of the web and the moment of inertia at the strong axis. When the dimension of the corrugation increases, the moment of inertia of the Y axis (Iy) decreases; thus, the plate girder will fail with a less critical buckling load (Pcr). Also, it can be concluded that as the steel plate thickness of the honeycomb web increases, the shear resistance increases as well. However, the spacing between the intermediate stiffener or the horizontal spacing of the web panel can enhance the shear resistance of honeycomb web girder if it was decreased due to increasing the action of tension field force that resists the diagonal tension developed at the web panel by the applied midspan concentrated force.","PeriodicalId":201498,"journal":{"name":"Scientific Review Engineering and Environmental Sciences (SREES)","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115376721","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