scholarly journals Exponent determination in a poorly gauged basin system in Nigeria based on flow characteristics investigation and regionalization method

2021 ◽  
Vol 3 (3) ◽  
Author(s):  
O. A. Fasipe ◽  
O. C. Izinyon
Keyword(s):  
Catchment Area ◽  
Flow Characteristics ◽  
Curve Number ◽  
Homogeneity Test ◽  
Small Hydropower ◽  
Ungauged Sites ◽  
River Basin Development ◽  
Research Findings ◽  
Resources Conservation

AbstractIn this study, a method for estimating the exponent “n” values of the catchment-area equations of four sub-basins within the poorly gauged Benin-Owena River Basin Development Authority (BORBDA) in Nigeria is presented to enable the estimation of flows at ungauged sites within the basin and the determination of small hydropower (SHP) potential at different locations in each sub-basin and the entire basin. Optimal prediction of streamflow characteristics in poorly gauged basin requires developing a methodology for extrapolation of data from gauged to ungauged sites within the basin. Four sub-catchments of BORBDA, a poorly gauged basin in Nigeria, were investigated using Remote Sensing (RS), Geographic Information System (GIS), statistical techniques, and Natural Resources Conservation Service-Curve Number (NRCS-CN) hydrological model. Discharge values at gauged sites (Qg) were obtained from recorded discharge values collected for 12 months at an established gauging station in each sub-basin. RS and GIS techniques were used to develop classification maps and obtain crucial data like curve number (CN), elevation, Hydrologic Soil Group (HSG), rainfall intensity, slope, area of gauged and ungauged required for evaluating spatial discharge (ungauged) utilizing NRCS-CN model. From the established model for each sub-basin, exponent “n” in the relationship between discharge and catchment area was obtained to be 0.23, 0.41, 0.71, and 0.74. Using the lumped modeling approach, which considers a watershed as a single unit for computation, where watershed parameters and variables were to be averaged produced “n” = 0.52 for BORBDA area, which is within the range of 0.5–0.85 suggested by previous researchers. Obtained BORBDA exponent “n” was validated for use in the entire basin through soil homogeneity test by generating BORBDA soil map which confirms the four sub-basins investigated share similar HSG A, B, and D with BORBDA. The exponent “n” value is useful for predicting flows in ungauged parts of the basin. The exponent “n” value obtained for the basin is helpful in the assessment of discharge and determination of SHP potential at different locations within the poorly gauged BORBDA basin, and the dissemination of the research findings will find practical use and guide to practicing hydrologists in Nigeria and locations around the world with similar challenges of poorly gauged basins particularly Africa and other developing countries.

scholarly journals Determination of Watershed Characteristics and Curve Number (CN) for Ponnaniyaru Dam Catchment Area

2018 ◽  
Vol 7 (3.12) ◽  
pp. 558
Author(s):  
Selvakumar R ◽  
Nasir N ◽  
Suribabu C R
Keyword(s):  
Catchment Area ◽  
Curve Number ◽  
Drainage Density ◽  
Significant Parameter ◽  
Present Case Study ◽  
Scs Cn ◽  
Hydrologic Conditions ◽  
Selection Of

In SCS-CN method, curve number is significant parameter in estimating runoff from the catchment of the reservoir or inflow to the reservoir. As this curve number is function of several parameters like hydrological soil group, LULC, land treatment, hydrologic conditions and AMC, the selection of CN for prediction of inflow to the lake or reservoir is considered as a crucial in the hydrological studies. LULC, micro-watershed, drainage density, and catchment slope are obtained using spatial analysis and also SCS Curve Number value for Ponnaniyaru dam catchment area is derived from the LULC data. Further, CN value is evaluated from actual rainfall data and runoff volume collected at the reservoir. The study reveals the significant variation of CN value among each event. The present case study highlights the sensitiveness of CN value in the computation of runoff from the watershed. Keywords: Curve number, LULC, AMC, drainage density. 

Determination of water erosion in Kowsar catchment area and evaluation of Gabion structures in its control

2020 ◽  
Vol 79 (22) ◽  
Author(s):  
Mohammad Albaji ◽  
Behnaz Ershadian ◽  
Abdolhossein Noori Nejad ◽  
Ebrahim Mohammadi ◽  
Shoja Ghorban Dashtaki
Keyword(s):  
Catchment Area ◽  
Water Erosion

scholarly journals A New Empirical Approach to Calculating Flood Frequency in Ungauged Catchments: A Case Study of the Upper Vistula Basin, Poland

Water ◽  
2019 ◽  
Vol 11 (3) ◽  
pp. 601 ◽  
Author(s):  
Dariusz Młyński ◽  
Andrzej Wałęga ◽  
Tomasz Stachura ◽  
Grzegorz Kaczor
Keyword(s):  
Empirical Model ◽  
Catchment Area ◽  
Flood Frequency ◽  
Ungauged Catchments ◽  
Volume Determination ◽  
Statistical Verification ◽  
Observation Series ◽  
Data Estimation

The aim of the work was to develop a new empirical model for calculating the peak annual flows of a given frequency of occurrence (QT) in the ungauged catchments of the upper Vistula basin in Poland. The approach to the regionalization of the catchment and the selection of the optimal form of the empirical model are indicated as a novelty of the proposed research. The research was carried out on the basis of observation series of peak annual flows (Qmax) for 41 catchments. The analysis was performed in the following steps: statistical verification of data; estimation of Qmax flows using kernel density estimation; determination of physiographic and meteorological characteristics affecting the Qmax flow volume; determination of the value of dimensionless quantiles for QT flow calculation in the upper Vistula basin; verification of the determined correlation for the calculation of QT flows in the upper Vistula basin. Based on the research we conducted, we found that the following factors have the greatest impact on the formation of flood flows in the upper Vistula basin: the size of catchment area; the height difference in the catchment area; the density of the river network; the soil imperviousness index; and the volume of normal annual precipitation. The verification procedure that we performed made it possible to conclude that the developed empirical model functions correctly.

scholarly journals Understanding Uncertainty and Risk in Management

2020 ◽  
Vol 12 (1) ◽  
pp. 12-35
Author(s):  
Piotr Jedynak ◽  
Sylwia Bąk
Keyword(s):  
Value Added ◽  
Research Process ◽  
Main Method ◽  
Proper Understanding ◽  
Organization Management ◽  
One Dimensional ◽  
Modern Management ◽  
Research Findings ◽  
Selection Of

AbstractObjective: The purpose of this text is to identify approaches to defining and subsequently reviewing the definitions of uncertainty and risk as interdisciplinary terms which are of key importance in modern management.Methodology: The work is theoretical. The main method used in the research process was the analysis of scientific literature. A one-dimensional logical classification method was also used, in order to categorize approaches to defining uncertainty and risk, satisfying the exhaustive and mutually exclusive criteria in the selection of categories of approaches.Findings: The main results of the work are: 1) identification of approaches to defining uncertainty and risk, 2) interdisciplinary review of definitions of uncertainty and risk indicating the criteria to distinguish between the two, and 3) determination of the meaning of the terms uncertainty and risk in modern management.Value Added: Considering the approaches to defining uncertainty and risk taken from many fields and disciplines of science, this text is a compendium of theoretical knowledge for the proper understanding and meaning of these concepts in management.Recommendations: The research findings can have implications for both management theory as well as the practice of organization management.

scholarly journals Determination of occupational anxiety levels of teacher candidates studying in a different departmentsFarklı bölümlerde öğrenim gören öğretmen adaylarının mesleki kaygı düzeylerinin belirlenmesi

2018 ◽  
Vol 15 (4) ◽  
pp. 2168
Author(s):  
Duygu Harmandar Demirel ◽  
Emrah Serdar ◽  
Mehmet Demirel
Keyword(s):  
Prospective Teachers ◽  
Teacher Candidates ◽  
Sampling Methods ◽  
Personal Information ◽  
English Summary ◽  
Teaching Profession ◽  
Significant Difference ◽  
Research Findings ◽  
Anxiety Levels

The aim of this study is to determine the anxiety levels of the students studying in the teaching departments and to examine these according to different variables. The sample of the study consisted of 400 non-random sampling methods and 400 prospective teachers who were studying at Dumlupinar University. The personal information form created by the researchers and the data related to the pre-service teachers' concerns about the teaching profession were provided by Caba and Yalçınalp (2009). In the research findings: “Gender”, “Age”, “Satisfaction Status”, “Class”, “Faculty” and “Sports Making Status” showed a significant difference in “OAST” total scores (p <0.05). As a result, it can be concluded that the vocational anxiety levels of the teacher candidates studying in different departments differ according to some variables.Extended English summary is in the end of Full Text PDF (TURKISH) file. ÖzetBu araştırma ile öğretmenlik bölümlerinde okuyan öğrencilerinin mesleğe yönelik kaygı düzeylerini belirlemek ve bunu farklı değişkenlere göre incelemektir. Araştırmanın örneklemini seçkisiz olmayan örnekleme yöntemlerinden uygun örnekleme yoluyla seçilen ve Dumlupınar Üniversitesinde öğrenim görmekte olan 400 öğretmen adayı oluşturmaktadır. Çalışmada oluşturulan demografik bilgi formu ve öğretmen adaylarının öğretmenlik mesleğine yönelik kaygılarına ilişkin veriler Cabı ve Yalçınalp (2009) tarafından geliştirilen Öğretmen Adaylarına Yönelik Mesleki Kaygı Ölçeği (ÖAYMK) ile sağlanmıştır. Verilerin analizinde; betimsel istatistik yöntemler, Man Whitney U ve Kruskal Wallis testlerinden faydalanılmıştır. Araştırma bulgularında: “Cinsiyet”, “Yaş”, “Okuduğu Bölümden Memnun Olma Durumu”, “Sınıf”, “Fakülte” ve “Spor Yapma Durumu” göre “ÖAYMK” toplam puanlarında manidar farklılık bulunmuştur. Araştırmaya gore, öğretmen adaylarının meslekleri ile ilgili kaygı seviyelerinin değişkenlere göre farklılaştığı sonucuna varılabilir.

scholarly journals Pengaruh Metode Pendidikan al-Qur�an Orang Dewasa terhadap Kemampuan Membaca al-Qur�an

2018 ◽  
Vol 1 (1) ◽  
pp. 1-24
Author(s):  
Hafsari Hafsari Hafsari
Keyword(s):  
Data Analysis ◽  
Reading Ability ◽  
Quantitative Research ◽  
Linear Regression Analysis ◽  
Homogeneity Test ◽  
Validity And Reliability ◽  
Normality Test ◽  
Ex Post ◽  
Ex Post Facto

This study aims to determine the method of adult Al-Qur'an education (Dirosa) on the ability to read the Koran. This research is descriptive quantitative research with the ex-post facto design. Determination of the sample is 50% of the population entitled 90, namely 45 research samples. The research data use questionnaire and test instruments that have been tested for validity and reliability. Before carrying out data analysis, the data were tested first, namely normality test and homogeneity test. Data analysis The results of the study used descriptive statistical analysis and hypothesis analysis. The results showed that: (1) the method of adult Al-Quran education (Dirosa) as a whole respondents who answered always (SL) by 65%, who answered frequently (SR) by 30%, who answered sometimes (KD) for 5%, who answer rarely (JR) and never (TP) by 0%; (2) Ability to read al-Qur'an respondents with excellent predicate of 43 or 96%, good predicate of 2 or 4%, predicate sufficient, predicate less and predicate failed at 0 or 0%; (3) Based on the results of a simple linear regression analysis to determine the effect of adult Al-Qur'an education methods (variable X) on the ability to read the Qur'an (Variable Y) with the independent variable (method Dirosa) to the honest variable ( Qur'anic reading ability is 67.2%, while other variable costs. Significance value is 0,000 <0,05 so H0 is rejected and H1 is accepted, which means there is a significant (significant) influence of the Dirosa (X) method variable on the ability to read the Qur'an (Y). The interpretation of the r-value of 0.820 shows very strong

scholarly journals Using Symbols and Shapes for Analysis in Small Focus Group Research

2016 ◽  
Author(s):  
Oladokun Omojola
Keyword(s):  
Focus Group ◽  
Prima Facie ◽  
Group Method ◽  
Group Discussions ◽  
Focus Group Research ◽  
Group Research ◽  
Research Findings ◽  
Small Focus ◽  
Focus Group Method

Substantial literature exists to support the growing importance of focus group research, having been around for decades. Its ubiquity under the scholarship radar is not in doubt while the analyses of findings commonly seen are scholarly and significantly sophisticated. However, these analyses have been found to be limited in scope for fresh adopters of the focus group method, non-literate beneficiaries of research findings and business people who are critically averse to lengthy textual statements about outcomes. This article introduces the use of symbols as a means of analyzing responses from small focus group discussions. It attempts to demonstrate that using symbols can substantially assist in the prima facie determination of perceptions from a focus group membership, its patterns of agreement and disagreement, as well as the sequence of its discussions.

scholarly journals Yoga and victims

Temida ◽  
2014 ◽  
Vol 17 (1) ◽  
pp. 47-64 ◽  
Author(s):  
Vesna Nikolic-Ristanovic
Keyword(s):  
Human Rights ◽  
Literature Review ◽  
Natural Disasters ◽  
Holistic Approach ◽  
Crime Victims ◽  
Personal Experiences ◽  
Victim Support ◽  
Research Findings ◽  
Victims Of Crime

In this paper the findings of literature review and explorative empirical research of yoga application in the work with victims of various forms of sufferings is presented. The largest notion of victim is accepted, which encompasses victims of crime, victims of human rights violations (including convicted persons), as well as victims of war, natural disasters and other sufferings. After determination of the notion of victim and yoga, the review and analyses of research findings and direct experiences with the application of yoga in victim support and victimisation prevention worldwide and in Serbia, is done. The author?s research findings as well as personal experiences with the application of yoga in the work with prisoners in prison for women in Pozarevac (Serbia), within the workshops that Victimology Society of Serbia implemented during 2012/2013, are presented as well. In the conclusions, contribution of yoga to holistic approach to victim support as well as important role that yoga may have in prevention of victimisation and criminalisation, is stressed. The importance of yoga for support of prisoners as the part of preparation for re-entry and with the aim to prevent recidivism, as well as to enable their more successful reintegration into the society, is particularly emphasised. The paper is based on the research implemented by the author for the purpose of writing the final essey at the course for yoga instructors on International yoga academy, Yoga Allience of Serbia.

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