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Geomorphology

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https://www.readbyqxmd.com/read/28919651/land-use-change-impacts-on-floods-at-the-catchment-scale-challenges-and-opportunities-for-future-research
#1
M Rogger, M Agnoletti, A Alaoui, J C Bathurst, G Bodner, M Borga, V Chaplot, F Gallart, G Glatzel, J Hall, J Holden, L Holko, R Horn, A Kiss, S Kohnová, G Leitinger, B Lennartz, J Parajka, R Perdigão, S Peth, L Plavcová, J N Quinton, M Robinson, J L Salinas, A Santoro, J Szolgay, S Tron, J J H van den Akker, A Viglione, G Blöschl
Research gaps in understanding flood changes at the catchment scale caused by changes in forest management, agricultural practices, artificial drainage, and terracing are identified. Potential strategies in addressing these gaps are proposed, such as complex systems approaches to link processes across time scales, long-term experiments on physical-chemical-biological process interactions, and a focus on connectivity and patterns across spatial scales. It is suggested that these strategies will stimulate new research that coherently addresses the issues across hydrology, soil and agricultural sciences, forest engineering, forest ecology, and geomorphology...
July 2017: Water Resources Research
https://www.readbyqxmd.com/read/28917178/adaptive-management-in-the-context-of-barriers-in-european-freshwater-ecosystems
#2
Kim Birnie-Gauvin, Jeroen S Tummers, Martyn C Lucas, Kim Aarestrup
Many natural habitats have been modified to accommodate for the presence of humans and their needs. Infrastructures - such as hydroelectric dams, weirs, culverts and bridges - are now a common occurrence in streams and rivers across the world. As a result, freshwater ecosystems have been altered extensively, affecting both biological and geomorphological components of the habitats. Many fish species rely on these freshwater ecosystems to complete their lifecycles, and the presence of barriers has been shown to reduce their ability to migrate and sustain healthy populations...
September 13, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28900127/orbital-bistatic-radar-observations-of-asteroid-vesta-by-the-dawn-mission
#3
Elizabeth M Palmer, Essam Heggy, Wlodek Kofman
We present orbital bistatic radar observations of a small-body, acquired during occultation by the Dawn spacecraft at asteroid Vesta. The radar forward-scattering properties of different reflection sites are used to assess the textural properties of Vesta's surface at centimeter-to-decimeter scales and are compared to subsurface hydrogen concentrations observed by Dawn's Gamma Ray and Neutron Detector to assess potential volatile occurrence in the surface and shallow subsurface. We observe significant differences in surface radar reflectivity, implying substantial spatial variations in centimeter-to-decimeter-scale surface roughness...
September 12, 2017: Nature Communications
https://www.readbyqxmd.com/read/28888205/measuring-geomorphological-vulnerability-on-beaches-using-a-set-of-indicators-gvi-a-tool-for-management
#4
Carolina Peña-Alonso, Pablo Fraile-Jurado, Luis Hernández-Calvento, Emma Pérez-Chacón, Eduard Ariza
A system of indicators has been developed to evaluate beach geomorphological vulnerability (GVI) through: intrinsic susceptibility, the agents that model them, and their ability to remain stable over time. The method is applied to 34 beaches on the island of Gran Canaria (Spain) that experience different levels and conditions of human occupation, marine incidence, landforms and sediments, and spatial evolution that have been recorded since 1960. In contrast with other studies, the analysis of these dimensions (and their relationships) allows a diagnosis of the geomorphology of the beaches with an integrated approach...
September 6, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28876401/landslides-zonation-hazard-relation-between-geological-structures-and-landslides-occurrence-in-hilly-tropical-regions-of-brazil
#5
Rodrigo I Cerri, Fábio A G V Reis, Marcelo F Gramani, Lucilia C Giordano, José Eduardo Zaine
This paper presents a new approach of landslides zonation hazard studies, based on an integrated study of structural data along with geomorphological and external factors, in a hilly regions of Brazil, covered by a tropical humid rain-forest, called Serra do Mar. The Serra do Mar consists of a hilly region along the east coast of Brazil, with high slopes and many geological structures in a gneiss - migmatitic terrain. In contrast to traditional approaches, this method proposes that structural data (foliation, fractures and bedding planes) and its relation with the slope geometry, is important to be consider in the landslide zonation hazard, along with declivity, relative relief, soil and rock properties, land use and vegetation cover and hydrogeological and climate factors...
August 31, 2017: Anais da Academia Brasileira de Ciências
https://www.readbyqxmd.com/read/28875229/scaling-to-the-organism-an-innovative-model-of-dynamic-exposure-hotspots-in-stream-systems
#6
Kristen M Harrigan, Paul A Moore
In flowing systems, fluctuations in the frequency, magnitude, and duration of exposure occurs due to turbulence and geomorphology, causing spatial and temporal variations in chemical exposure at the scale of the organism. Spatial models representing toxicant distribution at the appropriate scales of stream organisms are noticeably missing from the literature. To characterize the fine scale distribution of pollutants in freshwater streams at the scale of a benthic organism, nine artificial stream habitats were created (riffle, pool, run, bend, woody debris) with either sand or gravel substrate...
September 5, 2017: Archives of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/28872731/urbanization-reduces-and-homogenizes-trait-diversity-in-stream-macroinvertebrate-communities
#7
Thomas R Barnum, Donald E Weller, Meghan Williams
More than half the world's population lives in urban areas, so quantifying the effects of urbanization on ecological communities is important for understanding whether anthropogenic stressors homogenize communities across environmental and climatic gradients. We examined the relationship of impervious surface coverage (a marker of urbanization) and the structure of stream macroinvertebrate communities across the state of Maryland and within each of Maryland's three ecoregions: Coastal Plain, Piedmont, and Appalachian, which differ in stream geomorphology and community composition...
September 5, 2017: Ecological Applications: a Publication of the Ecological Society of America
https://www.readbyqxmd.com/read/28860645/applications-of-unmanned-aerial-vehicles-in-intertidal-reef-monitoring
#8
Sarah L Murfitt, Blake M Allan, Alecia Bellgrove, Alex Rattray, Mary A Young, Daniel Ierodiaconou
Monitoring of intertidal reefs is traditionally undertaken by on-ground survey methods which have assisted in understanding these complex habitats; however, often only a small spatial footprint of the reef is observed. Recent developments in unmanned aerial vehicles (UAVs) provide new opportunities for monitoring broad scale coastal ecosystems through the ability to capture centimetre resolution imagery and topographic data not possible with conventional approaches. This study compares UAV remote sensing of intertidal reefs to traditional on-ground monitoring surveys, and investigates the role of UAV derived geomorphological variables in explaining observed intertidal algal and invertebrate assemblages...
August 31, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28855606/a-cross-sectional-observational-study-on-allergen-specific-ige-positivity-in-a-southeast-coastal-versus-a-southwest-inland-region-of-china
#9
Guangqiao Zeng, Wenting Luo, Zehong Wu, Ling Li, Peiyan Zheng, Huimin Huang, Nili Wei, Jiaying Luo, Baoqing Sun, Yong Liu
Few studies addressed trans-regional differences in allergen sensitization between areas within a similar latitudinal range but with distinct geomorphological features. We investigated specific IgE (sIgE) positivity to common allergens in populations from two southern China provinces. Using a uniformed protocol, serum samples were collected from 2778 subjects with suspected atopy in coastal Guangdong and inland Yunnan. The overall prevalence of sIgE positivity were 57.8% (95% CI: 56.0%, 59.6%) from Guangdong vs 60...
August 30, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28832638/the-potential-impact-of-new-andean-dams-on-amazon-fluvial-ecosystems
#10
Bruce R Forsberg, John M Melack, Thomas Dunne, Ronaldo B Barthem, Michael Goulding, Rodrigo C D Paiva, Mino V Sorribas, Urbano L Silva, Sabine Weisser
Increased energy demand has led to plans for building many new dams in the western Amazon, mostly in the Andean region. Historical data and mechanistic scenarios are used to examine potential impacts above and below six of the largest dams planned for the region, including reductions in downstream sediment and nutrient supplies, changes in downstream flood pulse, changes in upstream and downstream fish yields, reservoir siltation, greenhouse gas emissions and mercury contamination. Together, these six dams are predicted to reduce the supply of sediments, phosphorus and nitrogen from the Andean region by 69, 67 and 57% and to the entire Amazon basin by 64, 51 and 23%, respectively...
2017: PloS One
https://www.readbyqxmd.com/read/28811519/high-resolution-mapping-based-on-an-unmanned-aerial-vehicle-uav-to-capture-paleoseismic-offsets-along-the-altyn-tagh-fault-china
#11
Mingxing Gao, Xiwei Xu, Yann Klinger, Jerome van der Woerd, Paul Tapponnier
The recent dramatic increase in millimeter- to centimeter- resolution topographic datasets obtained via multi-view photogrammetry raises the possibility of mapping detailed offset geomorphology and constraining the spatial characteristics of active faults. Here, for the first time, we applied this new method to acquire high-resolution imagery and generate topographic data along the Altyn Tagh fault, which is located in a remote high elevation area and shows preserved ancient earthquake surface ruptures. A digital elevation model (DEM) with a resolution of 0...
August 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28810506/controls-on-anastomosis-in-lowland-river-systems-towards-process-based-solutions-to-habitat-conservation
#12
Paweł Marcinkowski, Robert C Grabowski, Tomasz Okruszko
Anastomosing rivers were historically common around the world before extensive agricultural and industrial development in river valleys. Few lowland anastomosing rivers remain in temperate zones, and the protection of these river-floodplain systems is an international conservation priority. However, the mechanisms that drive the creation and maintenance of multiple channels, i.e. anabranches, are not well understood, particularly for lowland rivers, making it challenging to identify effective management strategies...
December 31, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28799926/daily-runoff-prediction-using-the-linear-and-non-linear-models
#13
Alireza Sharifi, Yagob Dinpashoh, Rasoul Mirabbasi
Runoff prediction, as a nonlinear and complex process, is essential for designing canals, water management and planning, flood control and predicting soil erosion. There are a number of techniques for runoff prediction based on the hydro-meteorological and geomorphological variables. In recent years, several soft computing techniques have been developed to predict runoff. There are some challenging issues in runoff modeling including the selection of appropriate inputs and determination of the optimum length of training and testing data sets...
August 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/28793008/geo-environmental-zoning-using-physiographic-compartmentalization-a-proposal-for-supporting-sustainable-decision-making
#14
Claudia V S Corrêa, Fábio A G V Reis, Lucilia C Giordano, Adriano Bressane, Camila J Chaves, Ana Maria C DO Amaral, Hermes D Brito, Gerson A DE Medeiros
The geo-environmental zoning represents an important strategy in the territorial management. However, it requires a logical and structured procedure. Therefore, an approach using physiographic compartmentalization is proposed and applied as case study in a region covered by the topographic maps of São José dos Campos and Jacareí, Brazil. This region has great geological and geomorphological peculiarities, beyond being a place with large human interventions because of its quickly economic growth. The methodology is based on photointerpretation techniques and remote sensing in GIS environment...
August 7, 2017: Anais da Academia Brasileira de Ciências
https://www.readbyqxmd.com/read/28750228/radionuclides-and-soil-properties-as-indicators-of-glacier-retreat-in-a-recently-deglaciated-permafrost-environment-of-the-maritime-antarctica
#15
Ana Navas, Marc Oliva, Jesús Ruiz-Fernández, Leticia Gaspar, Laura Quijano, Iván Lizaga
Many ice-free environments in Maritime Antarctica are undergoing rapid and substantial environmental changes in response to recent climate trends. This is the case of Elephant Point (Livingston Island, South Shetland Islands, SSI), where the glacier retreat recorded during the last six decades exposed 17% of this small peninsula, namely a moraine extending from the western to the eastern coastlines and a relatively flat proglacial surface. In the southern margin of the peninsula, a sequence of Holocene raised beaches and several bedrock plateaus are also distributed...
December 31, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28735090/impacts-of-the-2003-and-2015-summer-heatwaves-on-permafrost-affected-rock-walls-in-the-mont-blanc-massif
#16
L Ravanel, F Magnin, P Deline
Rockfall is one of the main geomorphological processes that affects the evolution and stability of rock-walls. At high elevations, rockfall is largely climate-driven, very probably because of the warming of rock-wall permafrost. So with the ongoing global warming that drives the degradation of permafrost, the related hazards for people and infrastructure could continue to increase. The heatwave of summer 2015, which affected Western Europe from the end of June to August, had a serious impact on the stability of high-altitude rock-walls, including those in the Mont Blanc massif...
December 31, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28704670/cryo-conditioned-rocky-coast-systems-a-case-study-from-wilczekodden-svalbard
#17
M C Strzelecki, M Kasprzak, M Lim, Z M Swirad, M Jaskólski, Ł Pawłowski, P Modzel
This paper presents the results of an investigation into the processes controlling development of a cryo-conditioned rock coast system in Hornsund, Svalbard. A suite of nested geomorphological and geophysical methods have been applied to characterise the functioning of rock cliffs and shore platforms influenced by lithological control and geomorphic processes driven by polar coast environments. Electrical resistivity tomography (ERT) surveys have been used to investigate permafrost control on rock coast dynamics and reveal the strong interaction with marine processes in High Arctic coastal settings...
December 31, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28700595/origin-of-mounds-in-the-pantanal-wetlands-an-integrated-approach-between-geomorphology-pedogenesis-ecology-and-soil-micromorphology
#18
Jairo Calderari de Oliveira Junior, Raphael Moreira Beirigo, Mariane Chiapini, Alexandre Ferreira do Nascimento, Eduardo Guimarães Couto, Pablo Vidal-Torrado
Vegetated mounds are an important geomorphological feature of the Pantanal, where the influence of floods dictates not only hydropedological processes, but also the distribution and ecology of the flora and fauna. This work aimed to identify factors and processes that influence the formation and spatial distribution of the mounds, which are commonly associated with termite activity. In order to characterize pedological processes, macro and micro morphological descriptions, satellite image interpretation, dating of the sandy sedimentary material using OSL and carbon dating using 14C AMS were carried out...
2017: PloS One
https://www.readbyqxmd.com/read/28683427/impacts-of-climate-warming-on-the-frozen-ground-and-eco-hydrology-in-the-yellow-river-source-region-china
#19
Yue Qin, Dawen Yang, Bing Gao, Taihua Wang, Jinsong Chen, Yun Chen, Yuhan Wang, Guanheng Zheng
The Yellow River source region is located in the transition region between permafrost and seasonally frozen ground on the northeastern Qinghai-Tibet Plateau. The region has experienced severe climate change, especially air temperature increases, in past decades. In this study, we employed a geomorphology-based eco-hydrological model (GBEHM) to assess the impacts of climate change on the frozen ground and eco-hydrological processes in the region. Based on a long-term simulation from 1981 to 2015, we found that the areal mean maximum thickness of seasonally frozen ground ranged from 1...
December 15, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28640340/terrestrial-impact-structures-as-geoheritage-an-assessment-method-of-their-scientific-value-and-its-application-to-brazil
#20
Joana P Sánchez, José B R Brilha
Terrestrial impact structures are geological and geomorphological features with particular importance to understand the history and evolution of the planet. Impact structures are scattered around the world but in many countries these features are under threat, essentially due to anthropic factors. Impact structures with higher scientific value should be considered as geological heritage and, consequently, be subjected to geoconservation strategies. In order to select the most important impact structures to be properly conserved and managed, this paper proposes a quantitative assessment method of the scientific value of these structures...
April 2017: Anais da Academia Brasileira de Ciências
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