Physical Geography最新文献_第6页

Geomorphological and sedimentological evidences of palaeo-outburst flood events from TanglangLa-Gya catchment of River Indus, Ladakh, India 印度拉达克印度河TanglangLa Gya流域古突发洪水事件的地貌和沉积学证据

IF 1.6 4区地球科学

Physical Geography Pub Date : 2022-01-10 DOI: 10.1080/02723646.2021.2022339

D. Nag, B. Phartiyal, Pankaj Kumar, P. Joshi, Randheer Singh

{"title":"Geomorphological and sedimentological evidences of palaeo-outburst flood events from TanglangLa-Gya catchment of River Indus, Ladakh, India","authors":"D. Nag, B. Phartiyal, Pankaj Kumar, P. Joshi, Randheer Singh","doi":"10.1080/02723646.2021.2022339","DOIUrl":"https://doi.org/10.1080/02723646.2021.2022339","url":null,"abstract":"ABSTRACT Gya river, one of the main tributary of Indus, hosts several scattered palaeoflood deposits. The chronology, genesis and spatiotemporal relationships of these scattered deposits can throw light to the regional and global climatic fluctuations and their implications for the evolution of the valley. The valley structure of the Gya river consists of a broad middle reach alternating with narrow valleys and gorges in the upper and lower reaches which can be blocked by the slightest of sediment discharge damming the entire valley. The geomorphological, sedimentological and chronological study in this valley reveals multiple short-lived lake phases at 21–19.9 ka, 13 ka and 4.5 ka in the broader reach of the river during the transition periods when climate rapidly fluctuates between cold-dry and warm-wet. The damming in the valley is the result of the glacial lake outbursts in the head waters of the Gya catchment blocking the narrow lower reaches of the main channel by massive sediment. These lakes that are formed by valley damming contains ~108 m3 of water which subsequently breach out causing significant geomorphic changes on reach scale along the Gya river channel.","PeriodicalId":54618,"journal":{"name":"Physical Geography","volume":"43 1","pages":"879 - 901"},"PeriodicalIF":1.6,"publicationDate":"2022-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44848501","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Change detection of Jamuna River and its impact on the local settlements Jamuna河的变化检测及其对当地居民点的影响

IF 1.6 4区地球科学

Physical Geography Pub Date : 2022-01-10 DOI: 10.1080/02723646.2022.2026075

Md Ariful Haque, Sharmin Shishir, Anannya Mazumder, M. Iqbal

{"title":"Change detection of Jamuna River and its impact on the local settlements","authors":"Md Ariful Haque, Sharmin Shishir, Anannya Mazumder, M. Iqbal","doi":"10.1080/02723646.2022.2026075","DOIUrl":"https://doi.org/10.1080/02723646.2022.2026075","url":null,"abstract":"ABSTRACT Spatio-temporal change detection analysis of Jamuna River using low and medium-resolution satellite data between the years of 1972 and 2013 are dynamic to assess river spatio-temporal changes and their impacts on the local settlements over the specific time. This study employs remote sensing and geographic information system (GIS) proficiencies to identify the river bank shifting, erosion, and depositional features along with the population displacement. The satellite image of LANDSAT multispectral (MSS), thematic mapper (TM), and operational land imager (OLI) and thermal infrared sensor (TIRS) were used in this study. Supervised and unsupervised classification techniques have been used to identify land cover types and detect the changes using ArcGIS Pro 2.3.2. Supervised classifications performed well by validating ≥90% overall accuracy. The result shows total erosion was 3356 ha from 1972 to 2013, while the deposition was 5342 ha. Erosion and deposition cause the bank line shifting, river widening, and settlement displacement. Hundreds of displaced people suffered from loss of land, livelihood, increased poverty, food insecurity, lack of sanitation, and drinking water facilities. Thus, this study will be earnest in assisting the environmental management and associated planning including necessary measures.","PeriodicalId":54618,"journal":{"name":"Physical Geography","volume":"44 1","pages":"186 - 206"},"PeriodicalIF":1.6,"publicationDate":"2022-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43546923","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Mountain process regime characterization using a topographic morphological structural framework 使用地形形态结构框架的山过程状态表征

IF 1.6 4区地球科学

Physical Geography Pub Date : 2022-01-03 DOI: 10.1080/02723646.2021.2020968

B. Young, M. Bishop

{"title":"Mountain process regime characterization using a topographic morphological structural framework","authors":"B. Young, M. Bishop","doi":"10.1080/02723646.2021.2020968","DOIUrl":"https://doi.org/10.1080/02723646.2021.2020968","url":null,"abstract":"ABSTRACT Complex mountain geodynamics are difficult to decouple due to forcing factors, feedback mechanisms, and system couplings that arise from interacting atmospheric, surface, and tectonic processes. The operational-scale dependencies and process–form relationships that govern the spatio-temporal extent of process regimes, which in turn govern relief production, have yet to be adequately characterized and mapped. This research establishes a topographic morphological structural framework for representing and querying the spatial organizational structure of the topography that governs, and is governed by mountain geodynamics. The spatial scale-dependent structure of the topography is accounted for using land-surface parameters and land-surface partitioning into distinct terrain units that represent important aspects of the geomorphological system. The properties and spatial topology of terrain units provide constraints for modeling process–form relationships, which are represented as process–form indices and synthesized using logistic regression to empirically detect glacial and bedrock river incision process regimes at the basin-scale for 31 basins in the Central Karakoram at about 80% accuracy. The topographic morphological structural framework approach provides a mechanism for tractable representation of scale-dependent topographic structure for automated characterization of the land surface, providing insight into polygenetic geomorphological systems and systems coupling through defined process–form relationships.","PeriodicalId":54618,"journal":{"name":"Physical Geography","volume":"44 1","pages":"84 - 120"},"PeriodicalIF":1.6,"publicationDate":"2022-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46073110","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Retrieving dry snow stratigraphy using a versatile low-cost frequency modulated continuous wave (FMCW) K-band radar 使用多功能低成本调频连续波（FMCW）K波段雷达反演干雪地层

IF 1.6 4区地球科学

Physical Geography Pub Date : 2021-12-06 DOI: 10.1080/02723646.2021.2008104

Jacob Laliberté, A. Langlois, A. Royer, Jean-Benoît Madore, F. Gauthier

{"title":"Retrieving dry snow stratigraphy using a versatile low-cost frequency modulated continuous wave (FMCW) K-band radar","authors":"Jacob Laliberté, A. Langlois, A. Royer, Jean-Benoît Madore, F. Gauthier","doi":"10.1080/02723646.2021.2008104","DOIUrl":"https://doi.org/10.1080/02723646.2021.2008104","url":null,"abstract":"ABSTRACT Considering the increased popularity for backcountry mountain recreation activities, potentially problematic snowpack interfaces are currently of great interest given their impact on snow stability. The identification of interface vertical locations and spatial variability in the snowpack is essential for avalanche danger forecasting. The Gaspé Peninsula specific climate often leads to a complex snowpack development, where the need of improved monitoring is important. The goal of this research is to assess an automated method to detect contrasted snow interfaces using a 24 GHz Frequency Modulated Continuous Wave (FMCW) portable radar. Based on different in-situ configurations, we compared the radar amplitude signals with in-situ snow geophysical measurements, including SnowMicroPenetrometer (SMP). Radar measurements have been done following two different protocols: (1) mobile radar looking-up and down in order to understand the radar-snow wave interactions and optimize its parameters for spatial variability assessment of contrasted snow layers and (2) fixed radar looking-up to evaluate its potential in monitoring snow stratigraphy temporal variability. Results show good agreements with compared validation data with 80% of manually identified interfaces detection and a vertical positioning error of 3 cm. The presented FMCW radar appears to have a good potential for spatial and temporal variability assessment of snowpack stratigraphy.","PeriodicalId":54618,"journal":{"name":"Physical Geography","volume":"43 1","pages":"308 - 332"},"PeriodicalIF":1.6,"publicationDate":"2021-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46441270","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Impacts of an extreme flood on large wood recruitment and transport processes 极端洪水对大型木材吸收和运输过程的影响

IF 1.6 4区地球科学

Physical Geography Pub Date : 2021-11-29 DOI: 10.1080/02723646.2021.1980958

D. J. Martin, R. Pavlowsky, J. Bendix, T. Dogwiler, J. Hess

{"title":"Impacts of an extreme flood on large wood recruitment and transport processes","authors":"D. J. Martin, R. Pavlowsky, J. Bendix, T. Dogwiler, J. Hess","doi":"10.1080/02723646.2021.1980958","DOIUrl":"https://doi.org/10.1080/02723646.2021.1980958","url":null,"abstract":"ABSTRACT This research investigates impacts of an extreme flood on recruitment and transport of large wood (LW) in sub-basins of the North Fork River, Missouri. Data collection took place two months after a >500 year flood to characterize LW conditions before natural recovery processes could obscure impacts. We used sites from previous LW studies in the region as reference to help identify flood impacts. Results showed 1) LW load volumes were no different than reference sites, but individual LW pieces comprised a greater percentage of the total load, 2) a high proportion of pieces at flood-impacted sites contained root wads, 3) transport capacity of the flood-impacted sites was high compared to reference sites, and 4) LW recruitment increased exponentially with flood magnitude. These results suggest that extreme floods have a significant impact on the composition of the LW load, and that geomorphic impacts of such floods may result in enhanced transport capacities. Based on these findings, we present two possible post-flood LW response/recovery scenarios; one in which elevated transport capacity serves to speed system recovery to the pre-flood LW regime, and one in which the enhanced LW piece composition results in a new post-flood LW regime with an enhanced load.","PeriodicalId":54618,"journal":{"name":"Physical Geography","volume":"44 1","pages":"55 - 83"},"PeriodicalIF":1.6,"publicationDate":"2021-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45527529","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

West Coast vegetation shifts as a response to climate change over the past 130,000 years: geographic patterns and process from pollen data 西海岸植被变化作为对过去13万年气候变化的响应:花粉数据的地理模式和过程

IF 1.6 4区地球科学

Physical Geography Pub Date : 2021-10-26 DOI: 10.1080/02723646.2021.1990506

K. C. Glover, J. George, L. Heusser, G. MacDonald

{"title":"West Coast vegetation shifts as a response to climate change over the past 130,000 years: geographic patterns and process from pollen data","authors":"K. C. Glover, J. George, L. Heusser, G. MacDonald","doi":"10.1080/02723646.2021.1990506","DOIUrl":"https://doi.org/10.1080/02723646.2021.1990506","url":null,"abstract":"ABSTRACT We compiled pollen sequences from lake and offshore cores at least 6,000 years old (6 ka) for the Mediterranean and Marine ecoregions of the US West Coast. Principal Component Analysis highlighted vegetation differences in core-tops, the Holocene Thermal Maximum (6 ka) and Last Glacial Maximum (LGM, 19 ka). Core-top and HTM ordination produced clusters that reflected geographic clusters in the Sierra Nevada, and the Pacific Northwest coast. Little change in these clusters between 6-0 ka suggested that vegetation communities in coastal and alpine settings persisted, despite warmer global temperatures. PCA outliers reflect distinct pollen assemblages that often were isolated sites or bordered the Great Basin. During the LGM, greater shrub and herb presence in the Marine ecoregion interior indicated enhanced aridity, while conifer presence in coastal and Southern California indicated moist conditions. Qualitatively, tree taxa from the Last Interglacial (~130–120 ka) showed how vegetation shifted over 6–10 kyr from alder, to oak, then redwood, a successional pattern that began again at the Late Glacial (~15 ka). In future West Coast pollen studies, sampling and chronologic control at centennial resolution will enable further study of more time periods and rates of vegetation change in response to climate.","PeriodicalId":54618,"journal":{"name":"Physical Geography","volume":"42 1","pages":"542 - 560"},"PeriodicalIF":1.6,"publicationDate":"2021-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47132503","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Geomorphological features of the Jurassic Granites in NE Nigeria (Southern Sahara) 尼日利亚东北部(南撒哈拉)侏罗纪花岗岩地貌特征

IF 1.6 4区地球科学

Physical Geography Pub Date : 2021-10-21 DOI: 10.1080/02723646.2021.1993770

A. Bashir, M. Gül, Ceren Küçükuysal, Göksu Uslular

{"title":"Geomorphological features of the Jurassic Granites in NE Nigeria (Southern Sahara)","authors":"A. Bashir, M. Gül, Ceren Küçükuysal, Göksu Uslular","doi":"10.1080/02723646.2021.1993770","DOIUrl":"https://doi.org/10.1080/02723646.2021.1993770","url":null,"abstract":"ABSTRACT This study investigates the spectacular geomorphological features of Jurassic (Younger) Granites in NE Nigeria by using field observations and some structural (i.e. joints) analyses. The study area is in the Sahel region of the Subsaharan of Africa as a transition zone between the Sahara Desert and Equatorial region, where many studies have focused on the loess deposits, ergs, climate change, and Saharan Desert boundary changes. Morphological features of rocks in the study area have not been widely discussed in the literature. However, inselbergs, ruwares, and pillar structures are the major landforms in this vast plain with an arid environment. Boulders, blocks, mushrooms, and corestones, tafoni, shelter caves, flared slopes, polygonal cracks, and weathering pits are minor features. Weathering products consisting of white-colored, granular quartz-bearing grus and red clayey laterite surround the granite masses. Subsurface weathering has favored the formation of major geomorphological features; however, subsequent superficial weathering leading to hydration and stripping occurred mostly under the humid climatic conditions with seasonal variation of dry and humid climatic conditions. Local paleoenvironmental – paleoclimatic conditions would have prevented excess weathering and erosion in the study area.","PeriodicalId":54618,"journal":{"name":"Physical Geography","volume":"43 1","pages":"853 - 878"},"PeriodicalIF":1.6,"publicationDate":"2021-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47199129","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A review of recent studies on landslide hazard in Latin America 拉丁美洲滑坡灾害的最新研究综述

IF 1.6 4区地球科学

Physical Geography Pub Date : 2021-09-25 DOI: 10.1080/02723646.2021.1978372

Alejandro César Valdés Carrera, M. Mendoza, Teodoro Carlón Allende, J. L. Macías

{"title":"A review of recent studies on landslide hazard in Latin America","authors":"Alejandro César Valdés Carrera, M. Mendoza, Teodoro Carlón Allende, J. L. Macías","doi":"10.1080/02723646.2021.1978372","DOIUrl":"https://doi.org/10.1080/02723646.2021.1978372","url":null,"abstract":"ABSTRACT Over the last few decades, the impact of landslides has increased in Latin America. However, there is a deficiency in the region of diagnostic studies on landslide hazards. This review analyzes the state of the art of studies on landslide hazard occurred in Latin America. A search for articles published from 2000 to 2019 was carried out in Scopus, WoS, SciELO, REDIB, and Redalyc. The search yielded 1,365 publications, which were purged obtaining 283 articles, analyzed through a database organized in four categories: general information, study area, research objectives, and methodology. We identified an increase in the number of publications from the year 2011. Seventy-five percent of the 20 countries in the region published papers on landslides that had occurred in these countries, mainly research focus on susceptibility and characterization, and a reduced number, on hazardousness, inventories, trigger factors and conditioning factors. The results suggest the opportunity to incorporate novel methods, tools, techniques, and inputs into research of landslides in Latin America. This review constitutes an analytical and critical contribution to the study of landslide hazards in the region and indicates the studies that are urgent to enforce its integral management in the region and in other intertropical zones.","PeriodicalId":54618,"journal":{"name":"Physical Geography","volume":"44 1","pages":"243 - 286"},"PeriodicalIF":1.6,"publicationDate":"2021-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45312095","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 7

Tectonics, weathering, erosion and soils 构造、风化、侵蚀和土壤

IF 1.6 4区地球科学

Physical Geography Pub Date : 2021-09-22 DOI: 10.4324/9781003124405-2

Joseph Holden

引用次数: 0

Water and ice 水和冰

IF 1.6 4区地球科学

Physical Geography Pub Date : 2021-09-22 DOI: 10.4324/9781003124405-5

Joseph Holden

引用次数: 0