1,720,954 research outputs found
Variability of the river profiles of the gauging stations in the Savinja River catchment
No full textV Sloveniji imamo vzpostavljeno hidrološko mrežo vodomernih postaj, s pomočjo katere spremljamo razmere v vodotokih skoraj v realnem času. Sočasno pa se na vodomernih postajah izvajajo tudi občasne meritve pretokov za potrebe izdelave in posodabljanje pretočnih krivulj. Ker se v zadnjih letih za ta namen uporabljajo sodobni akustični merilniki, nam le-ti omogočajo tudi hkratno merjenje geometrije prečnega prereza.
V nalogi smo predstavili obdelavo podatkov meritev prečnih profilov in prikazali njihovo spreminjanje za sedem vodomernih postaj na reki Savinji. Primerjali smo spremenljivost površin prečnih profilov glede na geodetski posnetek prečnega profila obravnavane vodomerne postaje in nadmorske višine nivelete dna v izbranih točkah znotraj prečnega profila vodomerne postaje.
Rezultati analiz prikazujejo nenehno spreminjanje prečnih profilov zaradi odlaganja in odnašanja sedimentov. Ugotovili smo, da je večina največjih sprememb posledica odlaganja materiala. Vseeno pa dobljeni rezultati kažejo, da se struga Savinje v obravnavanih prečnih profilih dolgoročno gledano vseeno poglablja.Slovenia has a contemporary hydrological network of water gauging stations that monitor the situation of the watercourse in near real-time. At the same time, the occasional measurements of discharge are conducted at these stations in order to create and update rating curves. Modern acoustic gauges which have been used in recent years also enable the simultaneous measurement of the geometry of the cross-section.
The present work presents the data analysis of the measurements of cross-sections and the representation of the changes in seven water gauging stations on Savinja river. We compared the variability of the surface of cross-sections with respect to the geodetic image of the river profile of a chosen gauging station was compared and the elevation of the river bottom level at points within the cross-section of the water gauging station.
The results of the analysis show constant changes of the cross-section due to the erosion and accumulation of sediments. We found that most of the largest changes are due to material deposition. However, the obtained results show that the Savinja riverbed is still deepening in a long-term perspective
Use of a stohastic precipitation model for determing design discharges in savinja river basin
No full textZ vse bolj izrazitim spreminjanjem našega okolja kot posledica podnebnih sprememb, so tudi ekstremni vremenski pojavi vse pogostejši. Temu smo bili priča tudi v letu 2023, ko je obilno deževje povzročilo poplave, ki jih v novejši zgodovini Slovenije ne pomnimo. Te so povzročile ogromno škodo na infrastrukturi, gospodarstvu, lastnini ter duševnemu zdravju prebivalcev.
V nalogi smo spoznali enega izmed načinov, ki nam omogočajo predvidevanje oziroma računsko določanje tovrstnih ekstremnih dogodkov oziroma določanje projektnih pretokov. Obravnavali smo prispevno območje vodomerne postaje Nazarje, ki se nahaja v Zgornje Savinjski dolini na reki Savinji. Na podlagi podatkov pridobljenih s strani Agencije RS za okolje, smo v programskem orodju R, vzpostavili stohastični padavinski model za generiranje sintetičnih padavin in temperature zraka. Znotraj istega programskega orodja smo vzpostavili tudi hidrološki model padavine-odtok, s pomočjo katerega smo lahko na podlagi izračunanih sintetičnih padavin in temperature zraka ter verjetnostne analize določili projektne pretoke na obravnavanem območju.
Analiza generiranih podatkov za različna časovna obdobja z uporabo stohastičnega padavinskega modela je pokazala, da se scenariji in izračunane vrednosti lahko spreminjajo pri vsakem ponovnem zagonu modela, tudi če število scenarijev ostaja ne spremenjeno. To nakazuje potrebo po večkratnem ponavljanju izračunov z več scenariji za natančnejše rezultate. Nadaljnje analize so pokazale, da se projektni pretoki različnih povratnih dob ne spreminjajo, če se število scenarijev povečuje ob ohranjanju istega časovnega obdobja, temveč se ti zgolj dopolnijo z rezultati novih oziroma dodanih scenarijev.
Primerjava med merjenimi in generiranimi podatki je pokazala podobnosti v oblikah verjetnostnih krivulj projektnih pretokov, čeprav so bile razlike večje pri povratnih dobah nad 100 let. Na odstopanje med rezultati vpliva tudi uporaba dnevnih vrednostih. Za boljše delovanje modela bi bilo potrebno uporabljati urne časovne podatke in natančnejše podatke o temperaturi zraka.With the increasing changes in our environment due to climate change, extreme weather events are also becoming more frequent. We witnessed this in 2023 when heavy rainfall caused floods unprecedented in the history of Slovenia. These floods caused extensive damage to infrastructure, the economy, property, and the mental health of residents.
In this thesis, we explored one of several methods that allow us to predict or computationally determine such extreme events and design discharge values. We examined the catchment area of the Nazarje gauging station, located in the Upper Savinja Valley on the Savinja River. Based on the data obtained from the Slovenian Environmental Agency (ARSO), we established a stochastic precipitation model in the R software for generating synthetic precipitation and air temperature data. Within the same software, we also established a rainfall-runoff hydrological model, which enabled us to determine design discharge values in the studied area based on the calculated synthetic precipitation and air temperature data, and flood frequency analysis.
The analysis of generated data for different time periods using the stochastic model revealed that scenarios and calculated values can vary with each simulation of the model, even if the number of scenarios remains unchanged. This indicates the need for repeated calculations with more scenarios for more robust results. Further analyses showed that design discharge values for different return periods do not change if the number of scenarios increases while maintaining the same length of simulations, but rather are supplemented with results from new or additional scenarios. Comparison between measured and generated data showed similarities in the shapes of design discahrge curves, although differences were more significant for return periods over 100 years. For better model performance, it would be necessary to use hourly time step and more precise air temperature data, which we could not provide due to the sparse network of measuring stations
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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