This study investigates the effects of geoid variations on GLAS altimeter onboard ICESat satellite based water surface elevations (WSE) over Burdur Lake (BL). MODIS snow-covered area maps are used to detect water surfaces daily. The differences between ground observations of BL WSE and those calculated using ICESat Global EGM2008 geoid varied between -0.96m and -0.60m with a root mean square error of 0.73m. The errors of re-calculated water levels with the updated geoid heights varied from -0.20m to 0.16m and the root mean square error decreased to 0.12m. Comparison with DSI ground observations yielded R2 as 0.98. Water level differences between the successive winter and summer is 0.74m and remained within the maximum change of 1.0m.
本研究调查了大地水准面变化对布尔杜尔湖（BL）上空ICESat卫星水面高程（WSE）GLAS高度计的影响。MODIS雪覆盖区地图用于每天探测水面。BL WSE的地面观测值与使用ICESat Global EGM2008大地水准面的地面观测值之间的差异在-0.96m到-0.60m之间，均方根误差为0.73m。更新大地水准面高度后重新计算的水位误差在-0.20m到0.16m之间，均方误差降至0.12m。与DSI地面观测值相比，R2为0.98。连续冬季和夏季的水位差为0.74m，并保持在1.0m的最大变化范围内。
{"title":"Jeoid Değişimlerinin ICESat Altimetre Verisi ile Hesaplanan Su Seviyelerine Etkisi","authors":"F. Saka, A. Tekeli, Senayi Dönmez","doi":"10.18400/tekderg.634227","DOIUrl":"https://doi.org/10.18400/tekderg.634227","url":null,"abstract":"This study investigates the effects of geoid variations on GLAS altimeter onboard ICESat satellite based water surface elevations (WSE) over Burdur Lake (BL). MODIS snow-covered area maps are used to detect water surfaces daily. The differences between ground observations of BL WSE and those calculated using ICESat Global EGM2008 geoid varied between -0.96m and -0.60m with a root mean square error of 0.73m. The errors of re-calculated water levels with the updated geoid heights varied from -0.20m to 0.16m and the root mean square error decreased to 0.12m. Comparison with DSI ground observations yielded R2 as 0.98. Water level differences between the successive winter and summer is 0.74m and remained within the maximum change of 1.0m.","PeriodicalId":49442,"journal":{"name":"Teknik Dergi","volume":" ","pages":""},"PeriodicalIF":1.3,"publicationDate":"2021-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44523077","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Bu calismada ikili lojistik regresyon model kullanilarak yaya kazalarinin yaralanma siddetine etki eden faktorler belirlenmistir. Bu amacla Emniyet Genel Mudurlugu veri tabanindan elde edilen, Mersin’de 2015-2017 yillari arasinda tek bir tasit ve tek bir yayanin karistigi kazalara ait kaza duzeyindeki detayli veriler kullanilmistir. Yayalarin yaralanma siddetini belirlemek icin kaza sonrasi 30 gunluk surecin sonundaki veri kullanilmistir. Model sonuclari kazalara 55 yas ve ustu yayalarin karismasinin, erkek yayalarin karismasinin, kazada yayalarin kusurlu olmasinin, kazada hiz kusuru olmasinin ve kaza noktasinda yatay kurb bulunmasinin yaya kazalarinin yaralanma siddetinin 0,05 anlamlilik duzeyinde arttirdigini gostermistir. Yaya kazalarinin devlet yollarinda ve gece meydana gelmesi yaya kazalarinin yaralanma siddetini 0,10 anlamlilik duzeyinde artirmaktadir. Ote yandan, kazalara motosikletlerin karismasi yaralanma siddetini 0,05 anlamlilik duzeyinde azalmaktadir.
{"title":"Yaya Kazalarının Yaralanma Şiddetinin İncelenmesi: İkili Lojistik Regresyon Modeli Uygulaması","authors":"Murat Özen","doi":"10.18400/tekderg.670811","DOIUrl":"https://doi.org/10.18400/tekderg.670811","url":null,"abstract":"Bu calismada ikili lojistik regresyon model kullanilarak yaya kazalarinin yaralanma siddetine etki eden faktorler belirlenmistir. Bu amacla Emniyet Genel Mudurlugu veri tabanindan elde edilen, Mersin’de 2015-2017 yillari arasinda tek bir tasit ve tek bir yayanin karistigi kazalara ait kaza duzeyindeki detayli veriler kullanilmistir. Yayalarin yaralanma siddetini belirlemek icin kaza sonrasi 30 gunluk surecin sonundaki veri kullanilmistir. Model sonuclari kazalara 55 yas ve ustu yayalarin karismasinin, erkek yayalarin karismasinin, kazada yayalarin kusurlu olmasinin, kazada hiz kusuru olmasinin ve kaza noktasinda yatay kurb bulunmasinin yaya kazalarinin yaralanma siddetinin 0,05 anlamlilik duzeyinde arttirdigini gostermistir. Yaya kazalarinin devlet yollarinda ve gece meydana gelmesi yaya kazalarinin yaralanma siddetini 0,10 anlamlilik duzeyinde artirmaktadir. Ote yandan, kazalara motosikletlerin karismasi yaralanma siddetini 0,05 anlamlilik duzeyinde azalmaktadir.","PeriodicalId":49442,"journal":{"name":"Teknik Dergi","volume":" ","pages":""},"PeriodicalIF":1.3,"publicationDate":"2021-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47088351","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Exact Solution of Resource Leveling Problem by Exhaustive Enumeration with Parallel Programming Resource Leveling Problem (RLP) is solved by heuristic, meta-heuristic, and mathematical methods. However, the aforementioned methods cannot guarantee the exact solution for large size problems. In this study, number of feasible schedules which can be obtained by delaying the non-critical activities without violating the precedence relationships and elongating the project completion time are computed. All of the feasible schedules which can be defined as the search domain are enumerated and the guaranteed optimum solution for the RLP is obtained by a different method from the existing methods. Exponential equation between the search domain and the number of activities on serial path is derived and the insolvability of large RLP in a reasonable time by one central processing unit is verified. Partitioning of the problem into equal sizes is provided by parallel programming so that each particle contains the same number of enumeration. In this study, four RLP in which the largest problem has 36 activities are solved by exhaustive enumeration within reasonable solution time and it is proved that the proposed method is applicable. Exact solutions of larger problems can also be obtained by the proposed method if the problem is partitioned into smaller sizes.
{"title":"Kaynak Dengeleme Probleminin Arama Uzayını Paralel Programlama ile Tarayarak Kesin Çözümü","authors":"Önder Halis Bettemi̇r, Tuğba Erzurum","doi":"10.18400/tekderg.595238","DOIUrl":"https://doi.org/10.18400/tekderg.595238","url":null,"abstract":"Exact Solution of Resource Leveling Problem by Exhaustive Enumeration with Parallel Programming Resource Leveling Problem (RLP) is solved by heuristic, meta-heuristic, and mathematical methods. However, the aforementioned methods cannot guarantee the exact solution for large size problems. In this study, number of feasible schedules which can be obtained by delaying the non-critical activities without violating the precedence relationships and elongating the project completion time are computed. All of the feasible schedules which can be defined as the search domain are enumerated and the guaranteed optimum solution for the RLP is obtained by a different method from the existing methods. Exponential equation between the search domain and the number of activities on serial path is derived and the insolvability of large RLP in a reasonable time by one central processing unit is verified. Partitioning of the problem into equal sizes is provided by parallel programming so that each particle contains the same number of enumeration. In this study, four RLP in which the largest problem has 36 activities are solved by exhaustive enumeration within reasonable solution time and it is proved that the proposed method is applicable. Exact solutions of larger problems can also be obtained by the proposed method if the problem is partitioned into smaller sizes.","PeriodicalId":49442,"journal":{"name":"Teknik Dergi","volume":" ","pages":""},"PeriodicalIF":1.3,"publicationDate":"2021-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45582870","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Geotechnical properties of hydrophilic (wettable) sands have been widely discussed in the literature. However, sands may gain hydrophobic (non-wettable) properties after being exposed to a hydrophobic agent in the nature. The number of available studies regarding the response of hydrophobic sands is very limited, and mostly focus on their environmental and hydrological aspects. To close this gap, a controlled laboratory testing program, consisting of 18 static strain-controlled consolidated undrained triaxial shear tests, was designed. Tests were performed on fully saturated hydrophilic and hydrophobic re-constituted Kizilirmak sand samples of different relative densities with pore water measurements. Hydrophobic samples were prepared by using 1 and 2 % WD-40 lubricant by mass. The effect of hydrophobic agent was assessed by comparing the stress – excess pore water pressure - strain responses of hydrophobic sand samples with those of conventional (hydrophilic) sand samples. Test results revealed that addition of hydrophobic agent increases the dilatancy of sands at low confining stresses (~100kPa) by decreasing the excess pore water pressure generation. At higher confining stresses (~400kPa) this effect is less pronounced. Moreover, the addition of hydrophobic agent up to 2% by mass does not systematically and significantly change the effective angle of shearing resistance of sand samples, independent of their initial relative density and confining stress levels.
{"title":"Consolidated Undrained Monotonic Shearing Response of Hydrophobic Kızılırmak Sand","authors":"K. Cetin, Hüseyin Tatar","doi":"10.18400/tekderg.543306","DOIUrl":"https://doi.org/10.18400/tekderg.543306","url":null,"abstract":"Geotechnical properties of hydrophilic (wettable) sands have been widely discussed in the literature. However, sands may gain hydrophobic (non-wettable) properties after being exposed to a hydrophobic agent in the nature. The number of available studies regarding the response of hydrophobic sands is very limited, and mostly focus on their environmental and hydrological aspects. To close this gap, a controlled laboratory testing program, consisting of 18 static strain-controlled consolidated undrained triaxial shear tests, was designed. Tests were performed on fully saturated hydrophilic and hydrophobic re-constituted Kizilirmak sand samples of different relative densities with pore water measurements. Hydrophobic samples were prepared by using 1 and 2 % WD-40 lubricant by mass. The effect of hydrophobic agent was assessed by comparing the stress – excess pore water pressure - strain responses of hydrophobic sand samples with those of conventional (hydrophilic) sand samples. Test results revealed that addition of hydrophobic agent increases the dilatancy of sands at low confining stresses (~100kPa) by decreasing the excess pore water pressure generation. At higher confining stresses (~400kPa) this effect is less pronounced. Moreover, the addition of hydrophobic agent up to 2% by mass does not systematically and significantly change the effective angle of shearing resistance of sand samples, independent of their initial relative density and confining stress levels.","PeriodicalId":49442,"journal":{"name":"Teknik Dergi","volume":" ","pages":""},"PeriodicalIF":1.3,"publicationDate":"2021-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45108615","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In construction industry, there is poor stakeholder management. However, the stakeholders play important roles in the completion of construction projects in line with their individual concerns and needs. Therefore stakeholders’ needs and concerns should be identified and managed carefully in order to complete a construction project successfully. In this study, it is attempted to obtain the nuisances created by building construction in residential areas on one of the external stakeholders, namely neighbouring community. For this purpose, a questionnaire is undertaken with 266 respondents among the external stakeholders of building constructions in different cities in north Cyprus. A structural equation modelling (SEM) is used to identify the important adverse impacts of construction of building projects to the neighbouring community. The results show that the adverse impacts of building construction are perceived by external stakeholders as disturbing. In addition, the conditions and culture of the region play an important role in the intensity of adverse impacts.
{"title":"Determination of Important Building Construction Nuisances in Residential Areas on Neighbouring Community","authors":"Cenk Budayan, Tolga Çelik","doi":"10.18400/tekderg.486628","DOIUrl":"https://doi.org/10.18400/tekderg.486628","url":null,"abstract":"In construction industry, there is poor stakeholder management. However, the stakeholders play important roles in the completion of construction projects in line with their individual concerns and needs. Therefore stakeholders’ needs and concerns should be identified and managed carefully in order to complete a construction project successfully. In this study, it is attempted to obtain the nuisances created by building construction in residential areas on one of the external stakeholders, namely neighbouring community. For this purpose, a questionnaire is undertaken with 266 respondents among the external stakeholders of building constructions in different cities in north Cyprus. A structural equation modelling (SEM) is used to identify the important adverse impacts of construction of building projects to the neighbouring community. The results show that the adverse impacts of building construction are perceived by external stakeholders as disturbing. In addition, the conditions and culture of the region play an important role in the intensity of adverse impacts.","PeriodicalId":49442,"journal":{"name":"Teknik Dergi","volume":" ","pages":""},"PeriodicalIF":1.3,"publicationDate":"2021-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43898601","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Innovation is seen as one of the major factors to improve construction industry. However, new technologies and processes are difficult for construction companies to adopt due to the conventional structure of the industry. Therefore, it needs to be regulated and promoted by the decision makers of whom prevailed of the benefits of innovation practices. This study aims to develop a structural equation model illustrating the impact of innovation on construction industry with a case study. The study results approved that there is a significant relationship between the innovation practices of construction companies and construction industry innovation.
{"title":"Structural Equation Model of the Factors Affecting Construction Industry Innovation Success","authors":"G. Demirdöğen, Z. Işık","doi":"10.18400/tekderg.567272","DOIUrl":"https://doi.org/10.18400/tekderg.567272","url":null,"abstract":"Innovation is seen as one of the major factors to improve construction industry. However, new technologies and processes are difficult for construction companies to adopt due to the conventional structure of the industry. Therefore, it needs to be regulated and promoted by the decision makers of whom prevailed of the benefits of innovation practices. This study aims to develop a structural equation model illustrating the impact of innovation on construction industry with a case study. The study results approved that there is a significant relationship between the innovation practices of construction companies and construction industry innovation.","PeriodicalId":49442,"journal":{"name":"Teknik Dergi","volume":" ","pages":""},"PeriodicalIF":1.3,"publicationDate":"2021-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49051176","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In this study, base shear and inelastic displacement limits of seismic isolation systems are presented through acceleration-displacement response spectra considering the ground motion and design provisions of the Turkish Building Seismic Design Code. A series of nonlinear response history analyses are performed using a combination of eight site-specific design spectra, six isolation systems having six periods and five yield levels . As a result, eight spectra presented herein can be used for the for preliminary design stage of seismic isolation systems of structures in Turkey.
{"title":"Nonlinear Response Spectra for Seismic Isolation System Design in Turkey","authors":"Aslihan Yolcu, Gülüm Tanırcan, C. Tüzün","doi":"10.18400/tekderg.511798","DOIUrl":"https://doi.org/10.18400/tekderg.511798","url":null,"abstract":"In this study, base shear and inelastic displacement limits of seismic isolation systems are presented through acceleration-displacement response spectra considering the ground motion and design provisions of the Turkish Building Seismic Design Code. A series of nonlinear response history analyses are performed using a combination of eight site-specific design spectra, six isolation systems having six periods and five yield levels . As a result, eight spectra presented herein can be used for the for preliminary design stage of seismic isolation systems of structures in Turkey.","PeriodicalId":49442,"journal":{"name":"Teknik Dergi","volume":" ","pages":""},"PeriodicalIF":1.3,"publicationDate":"2021-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47132978","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This paper introduces a new metaheuristic optimization method based on evolutionary algorithms to solve single-objective engineering optimization problems faster and more efficient. By considering constraints as a new objective function, problems turned to multi objective optimization problems. To avoid regular local optimum, different mutations and crossovers are studied and the best operators due their performances are selected as main operators of algorithm. Moreover, certain infeasible solutions can provide useful information about the direction which lead to best solution, so these infeasible solutions are defined on basic concepts of optimization and uses their feature to guide convergence of algorithm to global optimum. Dynamic interference of mutation and crossover are considered to prevent unnecessary calculation and also a selection strategy for choosing optimal solution is introduced. To verify the performance of the proposed algorithm, some CEC 2006 optimization problems which prevalently used in the literatures, are inspected. After satisfaction of acquired result by proposed algorithm on mathematical problems, four popular engineering optimization problems are solved. Comparison of results obtained by proposed algorithm with other optimization algorithms show that the suggested method has a powerful approach in finding the optimal solutions and exhibits significance accuracy and appropriate convergence in reaching the global optimum.
{"title":"An Effective Improved Multi-objective Evolutionary Algorithm (IMOEA) for Solving Constraint Civil Engineering Optimization Problems","authors":"H. G. Arab, A. M. Rayeni, M. Ghasemi","doi":"10.18400/tekderg.541640","DOIUrl":"https://doi.org/10.18400/tekderg.541640","url":null,"abstract":"This paper introduces a new metaheuristic optimization method based on evolutionary algorithms to solve single-objective engineering optimization problems faster and more efficient. By considering constraints as a new objective function, problems turned to multi objective optimization problems. To avoid regular local optimum, different mutations and crossovers are studied and the best operators due their performances are selected as main operators of algorithm. Moreover, certain infeasible solutions can provide useful information about the direction which lead to best solution, so these infeasible solutions are defined on basic concepts of optimization and uses their feature to guide convergence of algorithm to global optimum. Dynamic interference of mutation and crossover are considered to prevent unnecessary calculation and also a selection strategy for choosing optimal solution is introduced. To verify the performance of the proposed algorithm, some CEC 2006 optimization problems which prevalently used in the literatures, are inspected. After satisfaction of acquired result by proposed algorithm on mathematical problems, four popular engineering optimization problems are solved. Comparison of results obtained by proposed algorithm with other optimization algorithms show that the suggested method has a powerful approach in finding the optimal solutions and exhibits significance accuracy and appropriate convergence in reaching the global optimum.","PeriodicalId":49442,"journal":{"name":"Teknik Dergi","volume":" ","pages":""},"PeriodicalIF":1.3,"publicationDate":"2021-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46454825","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Snap-through buckling behaviour of rigid vinly polyethlene shallow spherical shells, undergoing large displacements, subjected to static ring loads is investigated by using finite differences and Newton-Raphson Method. The load-deflection diagrams corresponding to various values of thickness, depth and ring diameter of the shell with simply supported and clamped edges are drawn and compared. The accuracy of the used algorithm and the prepared computer program are tested by comparing some of the numerical results obtained in this study with those obtained by an experimental study, available in the relevant literature. Further steps on the concerning subject are achieved.
{"title":"Snap-through Buckling of Shallow Spherical Shells under Ring Loads","authors":"E. Karataş, R. F. Yükseler","doi":"10.18400/tekderg.565095","DOIUrl":"https://doi.org/10.18400/tekderg.565095","url":null,"abstract":"Snap-through buckling behaviour of rigid vinly polyethlene shallow spherical shells, undergoing large displacements, subjected to static ring loads is investigated by using finite differences and Newton-Raphson Method. The load-deflection diagrams corresponding to various values of thickness, depth and ring diameter of the shell with simply supported and clamped edges are drawn and compared. The accuracy of the used algorithm and the prepared computer program are tested by comparing some of the numerical results obtained in this study with those obtained by an experimental study, available in the relevant literature. Further steps on the concerning subject are achieved.","PeriodicalId":49442,"journal":{"name":"Teknik Dergi","volume":" ","pages":""},"PeriodicalIF":1.3,"publicationDate":"2021-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45598479","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In this study, the scour depth and dimensions of the scour hole around different shaped piers in the case of hydrographs succeeding steady flow were studied experimentally. The experiments were carried out by using circular, square, rectangular, lenticular and rectangular with trapezoidal nose to compare the various scour hole geometries at the same flow conditions. Numerous experiments were conducted in a rectangular flume (18.6 m long, 0.80 m wide and 0.75 m deep) with different triangular shaped hydrographs. The flume bed of 26 cm thickness consists of uniform graded material with D 50 =1.68 mm. The experiments were carried out in clear water conditions. The temporal variations of the equilibrium scour depths in front the pier and the scour hole dimensions were recorded by two different cameras. The equilibrium scour depths at lateral sides and downstream of the piers were also measured. Regression analysis was performed in order to derive empirical relations to predict temporal variations of the scour depth in the case of unsteady flow. The shape factor values were also investigated based on the experimental findings and the obtained values were compared with those available in literature. The performance of the obtained empirical relations was tested by using experimental data existing in the literature. The smallest scour hole was observed for the rectangular with trapezoidal noses pier. The increase in the scour hole dimensions for other cross-sections was in the following order: rectangular with circular noses, circular, square and rectangular piers.
{"title":"Experimental Investigation of Scour Hole Characteristics for Different Shapes of Piers Caused by Flood Hydrograph Succeeding Steady Flow","authors":"Aslı Bor Türkben, M. Güney","doi":"10.18400/tekderg.595126","DOIUrl":"https://doi.org/10.18400/tekderg.595126","url":null,"abstract":"In this study, the scour depth and dimensions of the scour hole around different shaped piers in the case of hydrographs succeeding steady flow were studied experimentally. The experiments were carried out by using circular, square, rectangular, lenticular and rectangular with trapezoidal nose to compare the various scour hole geometries at the same flow conditions. Numerous experiments were conducted in a rectangular flume (18.6 m long, 0.80 m wide and 0.75 m deep) with different triangular shaped hydrographs. The flume bed of 26 cm thickness consists of uniform graded material with D 50 =1.68 mm. The experiments were carried out in clear water conditions. The temporal variations of the equilibrium scour depths in front the pier and the scour hole dimensions were recorded by two different cameras. The equilibrium scour depths at lateral sides and downstream of the piers were also measured. Regression analysis was performed in order to derive empirical relations to predict temporal variations of the scour depth in the case of unsteady flow. The shape factor values were also investigated based on the experimental findings and the obtained values were compared with those available in literature. The performance of the obtained empirical relations was tested by using experimental data existing in the literature. The smallest scour hole was observed for the rectangular with trapezoidal noses pier. The increase in the scour hole dimensions for other cross-sections was in the following order: rectangular with circular noses, circular, square and rectangular piers.","PeriodicalId":49442,"journal":{"name":"Teknik Dergi","volume":" ","pages":""},"PeriodicalIF":1.3,"publicationDate":"2021-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46850696","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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