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219 results on '"Ruiz-Villanueva, Virginia"'

10. Automatic detection of instream large wood in videos using deep learning.

Author

Aarnink, Janbert, Beucler, Tom, Vuaridel, Marceline, and Ruiz-Villanueva, Virginia

Subjects
DEEP learning, CONVOLUTIONAL neural networks, DATA augmentation
Abstract

Instream large wood (i.e., downed trees, branches and roots larger than 1 m in length and 10 cm diameter) has essential geopmorphological and ecological functions supporting the health of river ecosystems. Still, even though its transport during floods may pose a risk, it is rarely observed and, therefore, poorly understood. This paper presents a novel approach to detect pieces of instream wood from video. The approach uses a Convolutional Neural Network to detect wood automatically. We sampled data to represent different wood transport conditions, combining 20 datasets to yield thousands of instream wood images. We designed multiple scenarios using different data subsets with and without data augmentation and analyzed the contribution of each one to the effectiveness of the model using k-fold cross-validation. The mean average precision of the model varies between 35 and 93 percent, and is highly influenced by the quality of the data which it detects. When the image resolution is low, the identified components in the labeled pieces, rather than exhibiting distinct characteristics such as bark or branches, appear more akin to amorphous masses or 'blobs'. We found that the model detects wood with a mean average precision of 67 percent when using a 418 pixels input image resolution. Also, improvements of up to 23 percent could be achieved in some instances and increasing the input resolution raised the weighted mean average precision to 74 percent. We show that the detection performance on a specific dataset is not solely determined by the complexity of the network or the training data. Therefore, the findings of this paper can be used when designing a custom wood detection network. With the growing availability of flood-related videos featuring wood uploaded to the internet, this methodology facilitates the quantification of wood transport across a wide variety of data sources. [ABSTRACT FROM AUTHOR]

Published
2024
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11. The Natural Wood Regime in Rivers

Author

WOHL, ELLEN, KRAMER, NATALIE, RUIZ-VILLANUEVA, VIRGINIA, SCOTT, DANIEL N., COMITI, FRANCESCO, GURNELL, ANGELA M., PIEGAY, HERVE, LININGER, KATHERINE B., JAEGER, KRISTIN L., WALTERS, DAVID M., and FAUSCH, KURT D.

Published
2019

17. Observed Changes in Air Temperature and Precipitation and Relationship between them, in the Upper Vistula Basin

Author

Łupikasza, Ewa, Niedźwiedź, Tadeusz, Pinskwar, Iwona, Ruiz-Villanueva, Virginia, Kundzewicz, Zbigniew W., Rowinski, Pawel, Editor-in-chief, Banaszkiewicz, Marek, Series editor, Pempkowiak, Janusz, Series editor, Lewandowski, Marek, Series editor, Sarna, Marek, Series editor, Kundzewicz, Zbigniew W., editor, Stoffel, Markus, editor, Niedźwiedź, Tadeusz, editor, and Wyżga, Bartłomiej, editor

Published
2016
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18. Projections of Precipitation in the Northern Foothills of the Tatra Mountains

Author

Pinskwar, Iwona, Chorynski, Adam, Kundzewicz, Zbigniew W., Ruiz-Villanueva, Virginia, Rowinski, Pawel, Editor-in-chief, Banaszkiewicz, Marek, Series editor, Pempkowiak, Janusz, Series editor, Lewandowski, Marek, Series editor, Sarna, Marek, Series editor, Kundzewicz, Zbigniew W., editor, Stoffel, Markus, editor, Niedźwiedź, Tadeusz, editor, and Wyżga, Bartłomiej, editor

Published
2016
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19. Variability of Flood Frequency and Magnitude During the Late 20th and Early 21st Centuries in the Northern Foreland of the Tatra Mountains

Author

Ruiz-Villanueva, Virginia, Wyżga, Bartłomiej, Kundzewicz, Zbigniew W., Niedźwiedź, Tadeusz, Łupikasza, Ewa, Stoffel, Markus, Rowinski, Pawel, Editor-in-chief, Banaszkiewicz, Marek, Series editor, Pempkowiak, Janusz, Series editor, Lewandowski, Marek, Series editor, Sarna, Marek, Series editor, Kundzewicz, Zbigniew W., editor, Stoffel, Markus, editor, Niedźwiedź, Tadeusz, editor, and Wyżga, Bartłomiej, editor

Published
2016
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20. Modelling Hydraulic Parameters of Flood Flows for a Polish Carpathian River Subjected to Variable Human Impacts

Author

Radecki-Pawlik, Artur, Wyżga, Bartłomiej, Czech, Wiktoria, Mikuś, Paweł, Zawiejska, Joanna, Ruiz-Villanueva, Virginia, Rowinski, Pawel, Editor-in-chief, Banaszkiewicz, Marek, Series editor, Pempkowiak, Janusz, Series editor, Lewandowski, Marek, Series editor, Sarna, Marek, Series editor, Kundzewicz, Zbigniew W., editor, Stoffel, Markus, editor, Niedźwiedź, Tadeusz, editor, and Wyżga, Bartłomiej, editor

Published
2016
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21. Large Wood Transport, Deposition and Remobilization during Floods in the Czarny Dunajec River: Outcomes from Numerical Modelling

Author

Ruiz-Villanueva, Virginia, Wyżga, Bartłomiej, Zawiejska, Joanna, Mikuś, Paweł, Hajdukiewicz, Hanna, Hajdukiewicz, Maciej, Stoffel, Markus, Rowinski, Pawel, Editor-in-chief, Banaszkiewicz, Marek, Series editor, Pempkowiak, Janusz, Series editor, Lewandowski, Marek, Series editor, Sarna, Marek, Series editor, Kundzewicz, Zbigniew W., editor, Stoffel, Markus, editor, Niedźwiedź, Tadeusz, editor, and Wyżga, Bartłomiej, editor

Published
2016
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22. Flood Generation Mechanisms and Changes in Principal Drivers

Author

Wyżga, Bartłomiej, Kundzewicz, Zbigniew W., Ruiz-Villanueva, Virginia, Zawiejska, Joanna, Rowinski, Pawel, Editor-in-chief, Banaszkiewicz, Marek, Series editor, Pempkowiak, Janusz, Series editor, Lewandowski, Marek, Series editor, Sarna, Marek, Series editor, Kundzewicz, Zbigniew W., editor, Stoffel, Markus, editor, Niedźwiedź, Tadeusz, editor, and Wyżga, Bartłomiej, editor

Published
2016
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23. Methods to Assess Large Wood Dynamics and the Associated Flood Hazard in Polish Carpathian Watercourses of Different Size

Author

Mikuś, Paweł, Wyżga, Bartłomiej, Ruiz-Villanueva, Virginia, Zawiejska, Joanna, Kaczka, Ryszard J., Stoffel, Markus, Rowinski, Pawel, Editor-in-chief, Banaszkiewicz, Marek, Series editor, Pempkowiak, Janusz, Series editor, Lewandowski, Marek, Series editor, Sarna, Marek, Series editor, Kundzewicz, Zbigniew W., editor, Stoffel, Markus, editor, Niedźwiedź, Tadeusz, editor, and Wyżga, Bartłomiej, editor

Published
2016
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24. Floods in Mountain Basins

Author

Stoffel, Markus, Wyżga, Bartłomiej, Niedźwiedź, Tadeusz, Ruiz-Villanueva, Virginia, Ballesteros-Cánovas, Juan Antonio, Kundzewicz, Zbigniew W., Rowinski, Pawel, Editor-in-chief, Banaszkiewicz, Marek, Series editor, Pempkowiak, Janusz, Series editor, Lewandowski, Marek, Series editor, Sarna, Marek, Series editor, Kundzewicz, Zbigniew W., editor, Stoffel, Markus, editor, Niedźwiedź, Tadeusz, editor, and Wyżga, Bartłomiej, editor

Published
2016
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36. River Widening in Mountain and Foothills Areas During Floods: Insights from a European Meta-Analysis

Author

Ruiz-Villanueva, Virginia, primary, Piégay, Hervé, additional, Scorpio, Vittoria, additional, Bachmann, Annette, additional, Brousse, Guillaume, additional, Cavalli, Marco, additional, Comiti, Francesco, additional, Crema, Stefano, additional, Fernández, Elena, additional, Furdada, Gloria, additional, Hajdukiewicz, Hanna, additional, Hunzinger, Lukas, additional, Lucía, Ana, additional, Marchi, Lorenzo, additional, Moraru, Adina, additional, Piton, Guillaume, additional, Rickenmann, Dieter, additional, Righini, Margherita, additional, Surian, Nicola, additional, Yassine, Rabab, additional, and Wyżga, Bartłomiej, additional

Published
2023
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