Article
Environmental Sciences
Matthias Jakob, Sarah Davidson, Gemma Bullard, Matthias Busslinger, Beatrice Collier-Pandya, Patrick Grover, Carie-Ann Lau
Summary: This paper discusses the occurrence and categorization of debris floods in steep mountain channels and small gravel bed rivers. Debris floods are classified into three categories based on their triggers, and their hazards involve inundation, scour, sediment transport, and bank erosion. The study introduces an approach for hazard quantification and mapping, aiming to homogenize debris-flood hazard assessments and mapping methodologies.
WATER RESOURCES RESEARCH
(2022)
Article
Geosciences, Multidisciplinary
M. Piantini, F. Gimbert, E. Korkolis, R. Rousseau, H. Bellot, A. Recking
Summary: Sediment flows generate ground vibrations through force fluctuations on the riverbed. However, linking force fluctuations to properties of highly concentrated sediment flows is challenging due to complexities from grain-to-grain interactions. In this study, downscaled flume experiments are conducted to measure force fluctuations, local seismic vibrations, and flow properties of highly concentrated sediment flows at high resolution. It is observed that force fluctuations exhibit hysteresis behaviors with flow surface elevation and mass, while having a unique negative relationship with solid concentration. The findings suggest that solid concentration should be incorporated as a key parameter in seismic models of such sediment flows.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Biodiversity Conservation
Larissa F. R. Silva, Diego M. P. Castro, Leandro Juen, Marcos Callisto, Robert M. Hughes, Marcel G. Hermes
Summary: The study aims to understand how anthropogenic stressors affect Odonata larval assemblages in neotropical savanna streams using multiple trait-based approaches. By collecting data on Odonata biological traits, strong relationships between environmental variables and sets of Odonata functional traits were found, highlighting the importance of using Odonata larval traits as a tool for assessing and monitoring anthropogenic impacts on neotropical savanna streams.
ECOLOGICAL INDICATORS
(2021)
Article
Geochemistry & Geophysics
Calvin G. Barnes, Nolwenn Coint, Melanie A. Barnes, Kevin R. Chamberlain, John M. Cottle, O. Tapani Ramo, Ariel Strickland, John W. Valley
Summary: This study examines the chemical and isotopic characteristics of arc magmas in the Klamath Mountains, northern California, and finds that different parts of the magmatic system display diverse isotopic signatures, reflecting the crystallization of heterogeneous magmas under varied temperatures and conditions.
JOURNAL OF PETROLOGY
(2021)
Article
Engineering, Geological
Matthew A. Thomas, Jason W. Kean, Scott W. McCoy, Donald N. Lindsay, Jaime Kostelnik, David B. Cavagnaro, Francis K. Rengers, Amy E. East, Jonathan Y. Schwartz, Douglas P. Smith, Brian D. Collins
Summary: The occurrence of postfire debris floods and flows in Central California following a storm that brought heavy rainfall was documented to evaluate the performance of the USGS M1 model in assessing postfire debris-flow hazards. The model performed similarly to the original calibration when estimating rainfall thresholds in the Central California coast, but its performance decreased when differentiating between minor and major postfire hydrologic response types. The study highlights the challenge of false positives in developing accurate rainfall thresholds for postfire debris flows and emphasizes the need for additional field-verified inventories to improve the model's regional calibration or replacement.
Article
Geosciences, Multidisciplinary
Tomas Galia, Radek Tichavsky, Andrea Fabianova, Vilem Spalovsky
Summary: Research focused on the recruitment and distribution patterns of large wood (LW) in headwater streams of forested mountain regions, where disturbances play a crucial role in determining the final distribution of LW. Analysis revealed that streams impacted by blowdowns had the highest LW volume and a uniform longitudinal distribution, while streams affected by high-magnitude cascade recruitment-transport processes had the lowest LW volume and irregular distribution. Dendroecological dating further showed that a significant percentage of LW died during specific periods due to disturbances, with different growth patterns observed in response to varying levels of disturbance intensity.
Article
Geology
Ryan D. Taylor, Leah E. Morgan, Fred Jourdan, Thomas Monecke, Erin E. Marsh, Richard J. Goldfarb
Summary: The Klamath Mountains gold province in California is the second most important historical producer of gold, having produced over 7 million ounces of gold. The study of hydrothermal muscovite grains suggests that the mineralization in the Klamath Mountains lasted for about 20-30 million years. There is no genetic link between the hydrothermal activity and magmatism, and the formation of gold deposits in the region is related to tectonic events, changes in stress regime, and fault movement.
ORE GEOLOGY REVIEWS
(2022)
Article
Marine & Freshwater Biology
Larissa F. R. Silva, Diego M. P. Castro, Leandro Juen, Marcos Callisto, Robert M. Hughes, Marcel G. Hermes
Summary: This study evaluated whether ecological thresholds could be detected along gradients of disturbances using larval Odonata genera. The results showed that different thresholds to anthropogenic disturbance existed between Odonata suborders, and suggested using Odonata larvae at the genus-level for constructing improved biomonitoring tools and obtaining more accurate impact assessments of neotropical stream sites.
Article
Environmental Sciences
Jason W. Kean, Dennis M. Staley
Summary: Southern California has a long history of damaging debris flows after wildfires, but forecasts of the frequency and magnitude of postfire debris flows are not as readily available as they are for earthquakes. Research shows that small debris flows can be expected almost every year, while major debris flows capable of damaging 40 or more structures have a recurrence interval between 10 and 13 years.
Article
Engineering, Geological
David Bernard, Emily Trousil, Paul Santi
Summary: Prediction of possible inundation areas is critical for debris-flow hazard management and was achieved in this research by developing runout parameters specific to post-wildfire debris flows. Using data from flows triggered by a storm in 2003, equations were modified to best estimate post-wildfire data, providing values within certain prediction intervals. These values are expected to apply to post-wildfire debris flows in Southern California mountain ranges.
ENGINEERING GEOLOGY
(2021)
Article
Environmental Sciences
Anna Serra-Llobet, John Radke, G. Mathias Kondolf, Larry Gurrola, J. David Rogers, Sarah Lindbergh, Johnny Douvinet
Summary: Historical flood information is not commonly used in the US for land use planning decisions. However, this study developed an approach that combines historical flood records, human development records, and geomorphological understanding to analyze flood exposure and risk as dynamic processes influenced by physical and human factors. The results show the common occurrence of floods and debris flows in Montecito, California, and the increased development in hazard zones despite policies discouraging it. Therefore, it is necessary to re-evaluate conventional flood management methods and better understand flood exposure risk to reduce vulnerability.
FRONTIERS IN ENVIRONMENTAL SCIENCE
(2023)
Article
Environmental Sciences
Karel Silhan
Summary: Detailed knowledge of past debris flow occurrences is crucial for understanding their connection to changing climatic variables and future events. This study conducted a dendrogeomorphic reconstruction of debris flows across a large mountain range in Central Europe, revealing 96 events at 21 sites. The analysis found that precipitation triggers significantly influenced the frequency and magnitude of debris flows, and that the different types of debris flows may be attributed to differences in the source materials and duration/magnitude of precipitation events.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Geography, Physical
Lenka Tlapakova, Tomas Panek, Sarka Horackova
Summary: The study reconstructed the evolution of fluvial terraces in headwater catchments in the Moravskoslezske Beskydy mountains using various techniques, identifying the influence of climate change and human activities on sediment transport over the past few centuries.
Article
Ecology
Ziyi Liang, Liyan Zhuang, Jiaping Yang, Fan Yang, Kai Yue, Xiangyin Ni, Zhenfeng Xu, Fuzhong Wu, Han Li, Roland Bol
Summary: This study explored the effects of plant debris on the concentrations and exports of dissolved organic carbon and total dissolved nitrogen in headwater streams. It found that woody debris had a slight impact on the concentrations and increased the exports, while non-woody debris decreased the exports. However, during the fall season, non-woody debris reversed its effect and enhanced the stream-water exports. Restricting non-woody debris inputs may improve the retention of carbon and nitrogen in the stream.
Article
Computer Science, Hardware & Architecture
Jose M. Cecilia, Daniel Hernandez, Benjamin Arratia, Salvador Pena-Haro, Javier Senent-Aparicio
Summary: This article introduces an in situ and Mobile crowdsourcing (MCS) monitoring system for efficient real-time flow measurement in ephemeral streams. The system is deployed in the Mar Menor watershed (Murcia, SE Spain), which is the first ecosystem in Europe with a legal entity established by citizens to address the environmental crisis.
Article
Biodiversity Conservation
Matthew R. Cover, Jeong Ho Seo, Vincent H. Resh
WESTERN NORTH AMERICAN NATURALIST
(2015)
Article
Environmental Sciences
Kevin B. Lunde, Matthew R. Cover, Raphael D. Mazor, Christopher A. Sommers, Vincent H. Resh
ENVIRONMENTAL MANAGEMENT
(2013)
Article
Engineering, Environmental
Eric D. Stein, Matthew R. Cover, A. Elizabeth Fetscher, Clare O'Reilly, Roxana Guardado, Christopher W. Solek
JOURNAL OF THE AMERICAN WATER RESOURCES ASSOCIATION
(2013)
Article
Ecology
Matthew R. Cover, Christine L. May, William E. Dietrich, Vincent H. Resh
JOURNAL OF THE NORTH AMERICAN BENTHOLOGICAL SOCIETY
(2008)
Article
Limnology
Justin E. Lawrence, Matthew R. Cover, Christine L. May, Vincent H. Resh
Article
Environmental Sciences
J. E. Lawrence, V. H. Resh, M. R. Cover
RIVER RESEARCH AND APPLICATIONS
(2013)
Article
Ecology
Erin F. Abernethy, Ivan Arismendi, Anna G. Boegehold, Checo Colon-Gaud, Matthew R. Cover, Erin Larson, Eric K. Moody, Brooke E. Penaluna, Arial J. Shogren, Alex J. Webster, M. Megan Woller-Skar
FRESHWATER SCIENCE
(2020)
Article
Marine & Freshwater Biology
Matthew R. Cover, Vincent H. Resh