scholarly journals The Role of Gate Operation in Reducing Problems with Cohesive and Non-Cohesive Sediments in Irrigation Canals

Water ◽  
2019 ◽  
Vol 11 (12) ◽  
pp. 2572 ◽  
Author(s):  
Shaimaa A. Theol ◽  
Bert Jagers ◽  
F. X. Suryadi ◽  
Charlotte de Fraiture
Keyword(s):  
Sediment Load ◽  
3D Models ◽  
Cohesive Sediments ◽  
Spatial And Temporal Patterns ◽  
Gate Operation ◽  
Canal Operation ◽  
System Sustainability ◽  
Opening And Closing

Sediments cause serious problems in irrigation systems, adversely affecting canal performance, driving up maintenance costs and, in extreme cases, threatening system sustainability. Multiple studies were done on the deposition of non-cohesive sediment and implications for canal design, the use of canal operation in handling sedimentation problems is relatively under-studied, particularly for cohesive sediments. In this manuscript, several scenarios regarding weirs and gate operation were tested, using the Delft3D model, applied to a case study from the Gezira scheme in Sudan. Findings show that weirs play a modest role in sedimentation patterns, where their location influences their effectiveness. On the contrary, gate operation plays a significant role in sedimentation patterns. Reduced gate openings may cause canal blockage while intermittently fully opening and closing of gates can reduce sediment deposition in the canal by 54% even under conditions of heavy sediment load. Proper location of weirs and proper adjusting of the branch canal’s gate can substantially reduce sedimentation problems while ensuring sufficient water delivery to crops. The use of 2D/3D models provides useful insights into spatial and temporal patterns of deposition and erosion but has challenges related to running time imposing a rather coarse modelling resolution to keep running times acceptable.

scholarly journals 3D Modeling of the Cultural Heritage: Between Opportunity and Necessity

2020 ◽  
Vol 10 (1) ◽  
pp. 27-30
Author(s):  
G.V. Herman ◽  
T. Caciora ◽  
Dorina Camelia Ilies ◽  
A. Ilies ◽  
Anca Deac ◽  
...  
Keyword(s):  
Cultural Heritage ◽  
3D Modeling ◽  
3D Models ◽  
3D Scanning ◽  
Modern Technology ◽  
Historical Background ◽  
Final Goal ◽  
Historical Monuments

AbstractRomania, due to its historical background, has many vestigial belongings to the cultural heritage, out of which the most noticeable (by number, age, architecture, symbolism and representation) are the wooden churches. Under these circumstances the role of the current study is to emphasize certain practical aspects (focused on the need to assess, preserve, restore and valorize) regarding the use of modern technology based on photogrammetry and 3D scanning. The case study was represented by the “Saint Martyrs Constantin Brȃncoveanu and His Sons” wooden church from Oradea Municipality, Bihor County, Romania; the edifice being included on the list of historical monuments ever since 2010. The final goal being to create 3D models for both the exterior and interior of the monument for research, restoration in case of need, sharing for education, entertainment, tourism purposes etc.

scholarly journals Communicating in Three Dimensions

2019 ◽  
Vol 3 (1) ◽  
pp. 100-116
Author(s):  
Adam Rabinowitz
Keyword(s):  
Three Dimensional ◽  
3D Models ◽  
Three Dimensions ◽  
Scientific Models ◽  
Additional Information ◽  
Public Consumption ◽  
3D Documentation ◽  
New Research

After excavating the Praedia of Iulia Felix at Pompeii in 1755, architect Karl Weber published the building with an axionometric illustration that showed the remains in three-dimensional perspective. In doing so, Weber communicated additional information about the form of the building in a manner that was both visually accessible to a lay audience and sufficiently “scientific” for a scholarly one. By contrast, digital 3D documentation methods in current archaeological practice can reinforce a division between “scientific” models intended for internal consumption by the project that produces them, and external communication in the form of lower-quality online digital displays. Using recent fieldwork at the Greek colonial site of Histria in Romania as a case-study, this paper explores the space between high-resolution contextualized 3D documentation used only by an internal audience and down-scaled, decontextualized 3D content designed for public consumption. In particular, it explores whether measurable 3D models derived from photogrammetrical capture are useful in communicating excavation results to non-specialists – and if so, in what ways. It presents several scenarios for the role of high-quality 3D documentation in both formal and informal scholarly communication, and discusses the potential for the reuse of such documentation to answer new research questions.

Determining Probability of Importance of Features in a Sketch

2017 ◽  
Vol 3 (4) ◽  
Author(s):  
Ricardo Cruz-Lozano ◽  
Fisseha M. Alemayehu ◽  
Stephen Ekwaro-Osire ◽  
Haileyesus B. Endeshaw
Keyword(s):  
Conceptual Design ◽  
Shape Matching ◽  
Three Dimensional ◽  
3D Models ◽  
User Preferences ◽  
Design Stage ◽  
Limited Experience ◽  
Expert Input

Sketches can be categorized as personal, shared, persuasive, and handover sketches. Depending on each category, their level of ambiguity also varies. The applications of sketches include conceptual design, eliciting user preferences, shape retrieval, and sketch-based modeling (SBM). There is a need for quantification of uncertainty in sketches in mapping of sketches to three-dimensional (3D) models in sketch-based modeling, in eliciting user preferences, and in tuning the level of uncertainty in sketches at the conceptual design stage. This paper investigates the role of probability of importance in quantifying the level of uncertainty in sketches by raising the following three research questions: How are the features in a sketch ranked? What is the probability of importance of features in a sketch? What is the level of uncertainty in a sketch? This paper presents an improved framework for uncertainty quantification in sketches. The framework is capable of identifying and ranking the features in the sketch, determining their probability of importance, and finally quantifying the level of uncertainty in the sketch. Ranking the features of a sketch is performed by a hierarchical approach, whereas probability of importance is determined by assessing the probability of likeliness using a shape matching approach and a probability transformation. Quantification of uncertainty is accomplished by using the principle of normalization of entropy. A case study of a bicycle sketch is used to demonstrate that the framework eliminates the need of expert input in assessment of uncertainty in sketches and, hence, can be used by design practitioners with limited experience.

The role of multiplicity in a cult: A case study

1987 ◽  
Author(s):  
William A. Worrall ◽  
Ann W. Stockman

Endangered Butterflies and their Non-Native Host Plants: Examining Shifting Values of Belonging in Restoration

2019 ◽  
Vol 3 (1) ◽  
pp. 1-9
Author(s):  
Robert M. Anderson ◽  
Amy M. Lambert
Keyword(s):  
Ecological Restoration ◽  
Native Species ◽  
Puget Sound ◽  
A Value ◽  
The Social ◽  
Remote Island ◽  
Scientific Truth ◽  
Native Host

The island marble butterfly (Euchloe ausonides insulanus), thought to be extinct throughout the 20th century until re-discovered on a single remote island in Puget Sound in 1998, has become the focus of a concerted protection effort to prevent its extinction. However, efforts to “restore” island marble habitat conflict with efforts to “restore” the prairie ecosystem where it lives, because of the butterfly’s use of a non-native “weedy” host plant. Through a case study of the island marble project, we examine the practice of ecological restoration as the enactment of particular norms that define which species are understood to belong in the place being restored. We contextualize this case study within ongoing debates over the value of “native” species, indicative of deep-seated uncertainties and anxieties about the role of human intervention to alter or manage landscapes and ecosystems, in the time commonly described as the “Anthropocene.” We interpret the question of “what plants and animals belong in a particular place?” as not a question of scientific truth, but a value-laden construct of environmental management in practice, and we argue for deeper reflexivity on the part of environmental scientists and managers about the social values that inform ecological restoration.

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