Revista Geográfica de Chile Terra Australis最新文献_第5页

Estimación de las variaciones espacio temporales de albedo en los glaciares Olivares, Chile Central 智利中部奥利瓦雷斯冰川反照率时空变化的估计

Revista Geográfica de Chile Terra Australis Pub Date : 2019-12-27 DOI: 10.23854/07199562.2019551.pena35

M. A. Peña, F. Olmedo

{"title":"Estimación de las variaciones espacio temporales de albedo en los glaciares Olivares, Chile Central","authors":"M. A. Peña, F. Olmedo","doi":"10.23854/07199562.2019551.pena35","DOIUrl":"https://doi.org/10.23854/07199562.2019551.pena35","url":null,"abstract":"Este estudio derivo mediciones de albedo en los glaciares Olivares Alfa, Beta y Gama, ubicados en Los Andes de Chile central, mediante el procesamiento de imagenes satelitales Landsat-8 adquiridas en Enero de 1990, 1996 y 2017, con el proposito de estimar las variaciones espaciales y temporales de dicha variable. Entre 1990 y 2017, el albedo promedio del glaciar Olivares Alfa se redujo en 0,17 (0,43- 0,26), lo que se tradujo en una tasa de retroceso anual de 1,78%. Durante el mismo periodo, el albedo promedio del glaciar Olivares Beta se redujo en 0,09 (0,48-0,39), lo que se tradujo en una tasa de retroceso anual de 1,33%, en tanto que el albedo promedio del glaciar Olivares Gama se redujo en 0,12 (0,45-0,33), traduciendose en una tasa de retroceso anual de 1,1%. El mapeo del diferencial de albedo de cada glaciar, resultante de restar el albedo de 1990 al de 2017, permitio apreciar las variaciones espaciales de la variable durante dicho periodo, evidenciando sus mayores decrecimientos tanto en las zonas de acumulacion como de ablacion de los glaciares. El calculo remoto de albedo podria incluirse en los balances de masa de estos y otros glaciares del pais, a fin de dimensionar el impacto de la reduccion de esta variable en la perdida de hielo y su relacion con la variabilidad climatica inducida por el calentamiento y cambio climatico global.","PeriodicalId":286871,"journal":{"name":"Revista Geográfica de Chile Terra Australis","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132683772","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Hacia el modelado de material particulado fino en Santiago, Chile, mediante imágenes MODIS 在智利圣地亚哥，通过MODIS图像模拟细颗粒物

Revista Geográfica de Chile Terra Australis Pub Date : 2019-12-27 DOI: 10.23854/07199562.2019551.pena74

M. A. Peña, P. Araya

{"title":"Hacia el modelado de material particulado fino en Santiago, Chile, mediante imágenes MODIS","authors":"M. A. Peña, P. Araya","doi":"10.23854/07199562.2019551.pena74","DOIUrl":"https://doi.org/10.23854/07199562.2019551.pena74","url":null,"abstract":"Este estudio exploro la capacidad que ofrece el producto de profundidad optica de aerosoles (aerosol optical depth, AOD) creado diariamente desde imagenes MODIS (Moderate Resolution Imaging Spectroradiometer) adquiridas a las 10:30 AM y 1:30 PM hora local, para predecir las concentraciones superficiales de material particulado fino (MP2,5), medidas en las estaciones de monitoreo de la ciudad de Santiago, Chile, durante los meses estivales del ano 2016. Para esto, fueron realizadas correlaciones lineales entre ambas fuentes de datos, remotos y de terreno, calzados en tiempo y espacio, que permitieron dilucidar los dias y estaciones donde MODIS-AOD puede ofrecer la mejor correlacion. Considerando estos casos fue realizado un modelo de regresion lineal simple que permitio explorar la capacidad predictiva de MODIS-AOD. Las mejores correlaciones fueron consistentemente obtenidas cuando los datos MODIS-AOD creados a la 1:30 PM fueron considerados por estacion a lo largo de todos los dias muestreados en el periodo de interes. Al agrupar las estaciones de Cerro Navia, Quilicura y Pudahuel, el coeficiente de correlacion fue 0,77, en tanto que el modelo de regresion explico el 63% del comportamiento de las concentraciones superficiales de MP2,5 y mostro una precision de 69,1%. Los hallazgos de este estudio exploratorio constituyen una primera aproximacion al modelado de las concentraciones superficiales de MP2,5 en la ciudad de Santiago, con miras a ser robustecido a futuro, para con ello contribuir a prever alertas ambientales y ocurrencias de enfermedades relacionadas a la exposicion del contaminante.","PeriodicalId":286871,"journal":{"name":"Revista Geográfica de Chile Terra Australis","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130293942","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Estimación de balance de masa del glaciar Echaurren Norte en el periodo 2020-2060 2020-2060年北埃乔伦冰川质量平衡估算

Revista Geográfica de Chile Terra Australis Pub Date : 2019-12-27 DOI: 10.23854/07199562.2019551.leon12

Aníbal León Pérez, Nicolás González Segura

引用次数: 0

Análisis multitemporal del uso de suelo Valle Lo Campino, Quilicura 土地利用的多时相分析Valle Lo Campino, Quilicura

Revista Geográfica de Chile Terra Australis Pub Date : 2019-12-27 DOI: 10.23854/07199562.2019551.alvarez45

Fabricio Álvarez Flores, Fabiola Barrenechea Riveros

{"title":"Análisis multitemporal del uso de suelo Valle Lo Campino, Quilicura","authors":"Fabricio Álvarez Flores, Fabiola Barrenechea Riveros","doi":"10.23854/07199562.2019551.alvarez45","DOIUrl":"https://doi.org/10.23854/07199562.2019551.alvarez45","url":null,"abstract":"The present investigation deals with the change of land cover through a multitemporal analysis between the years 1998-2018, in the commune of Quilicura, Metropolitan Region, in an area called Valle Lo Campino, defined by Cerro Renca and its foothills. For this purpose, a supervised classification was carried out in fiveyear periods based on satellite images, Google Earth support and the land use thematic classification established by the National Forest Corporation in 2011. From this, it was determined qualitatively and quantitatively change the territory according to thematic cartography and a confusion matrix. In addition, the population increase was determined based on data published for 2017 by the Statistics Institute of Chile and the determination of potential vehicular load established in the field, with the support of sample units. Overall, the analysis is the basis for road identification and improvement of the area and its connectivity to structuring routes, from the perspective of objective image, with the support of methodologies and inputs from geomatics, topographic concepts, the projection of new alternatives vials and ground support. At the same time, a landscape proposal is proposed that enhances the geographical characteristics and the landscape value, obtained from the environmental assessment guide presented by the Environmental Impact Assessment Service and the nature of Cerro Renca island within the Metropolitan Region.","PeriodicalId":286871,"journal":{"name":"Revista Geográfica de Chile Terra Australis","volume":"116 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114214947","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Ash fallout hazard from Irazú volcano, Costa Rica 来自哥斯达黎加Irazú火山的灰尘危害

Revista Geográfica de Chile Terra Australis Pub Date : 2018-12-19 DOI: 10.23854/07199562.2018541Barrantes13

G. B. Castillo, Santiago Nunez, E. Malavassi

{"title":"Ash fallout hazard from Irazú volcano, Costa Rica","authors":"G. B. Castillo, Santiago Nunez, E. Malavassi","doi":"10.23854/07199562.2018541Barrantes13","DOIUrl":"https://doi.org/10.23854/07199562.2018541Barrantes13","url":null,"abstract":"The eruptive period between 1963-1965 at Irazu volcano showed that Costa Rica is highly vulnerable to ash fallout. Ash was carried by wind currents to-wards the Great Metropolitan Area (GMA), southwest to the summit, which contains about 60% of the national population. Previous work on hazard as-sessment for ash fall at Irazu only estimate influence areas without detailing hazard levels based on the observed distribution of events between 1963-1965. These cartographic models are not suited for realistic risk estimation, informed land use planning or proper emergency management. In this paper, we used the computer code NG-TEPHRA for simulating ash fallout from Irazu volcano, as-sessing the associated volcanic hazard and developing an improved hazard map from ash fall by devising a hazard index that combines the spatial probabilities of relevant scenarios with estimates of deposited ash volumes. Previous simula-tions results from our group were already calibrated against observed historical and field (geological) data from the 1963-1965 eruptive period and were used for obtaining the final hazard map. Our results represent a contribution for land use planning and emergency management purposes based on the application of computer models and interdisciplinary research towards numerically informed hazard models.","PeriodicalId":286871,"journal":{"name":"Revista Geográfica de Chile Terra Australis","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121523362","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0