1
informe técnico
Efectúa el levantamiento topográfico de todo el glaciar Pastoruri con fines de comparación, este glaciar esta ubicado en la cuenca alta del río Pachacoto en la Cordillera Blanca.
2
informe técnico
Publicado 2001
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Realiza el levantamiento topográfico del límite del frente del glaciar Broggi localizado en la cuenca alta del río Llanganuco en la Cordillera Blanca.
3
artículo
Publicado 2015
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Original abstract: En los últimos años, a consecuencia del cambio climático se están registrando diversas alteraciones en los ecosistemas; uno de estos cambios se evidencia sobre los glaciares, provocando la fusión acelerada de sus masas de hielo y nieve, consecuentemente genera diversos riesgos para las poblaciones y con ictos por la disponibilidad del agua. En esta investigación se plantea determinar la variación espacio temporal de la Altitud de la Línea de Equilibrio (ELA) obtenida a través de la Altitud de la Línea de Nieve (SLA) de los glaciares de la Cordillera Blanca. Para ello se seleccionó 17 glaciares de donde se obtuvieron valores de SLA, durante el periodo 2001 2010, mediante análisis y técnicas de procesamiento de imágenes satelitales para la discriminación entre hielo y nieve. Para la validación se utilizó información de 4 glaciares de la Cordillera Blanc...
4
informe técnico
Publicado 2003
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El glaciar Broggi localizado hacia el norte de la Cordillera Blanca; se accede, desde Huaraz, vía carretera asfaltada, hasta la ciudad de Yungay (65 km) para luego tomar el desvío hacia la laguna Llanganuco, por carretera afirmada (35 km); y a partir de allí por un camino de herradura de 3-4 horas para llegar al pie del glaciar. Los glaciares Pastoruri y Gajap están emplazados al sur de la Cordillera Blanca; se accede, desde Huaraz, vía carretera asfaltada hasta la localidad de Pachacoto (50 km) para luego tomar el desvío hacia Pastoruri y Gajap (35 y 40 km) respectivamente; y el acceso hasta la zona de trabajo es, en promedio, media hora.
5
informe técnico
Publicado 2003
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Realiza la inspección del glaciar Paria, con el objetivo de encontrar lugares convenientes para la instalación de pluviómetros y obtener información de precipitaciones para correlacionar datos. Este glaciar esta ubicado en el distrito y provincia de Yungay, departamento de Áncash.
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informe técnico
Publicado 2003
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Presenta el monitoreo de los caudales de la cuenca del río Santa que abarca parte de los departamentos de Áncash y La Libertad, a fin de conocer el régimen de descarga de origen glaciar. En este sentido, analiza los resultados de las mediciones de aforo en ríos del Callejón de Huaylas.
7
artículo
Publicado 2005
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Original abstract: Discharge measurements, precipitation observations and hydrochemical samples from catchments of the Callejon de Huaylas watershed draining the Cordillera Blanca to the Rio Santa, Peru, facilitate estimating the glacier meltwater contribution to streamflow over different spatial scales using water balance and end-member mixing computations. A monthly water balance of the Yanamarey Glacier catchment shows elevated annual discharge over December 2001–July 2004 compared to 1998–1999, with net glacier mass loss in all months. Glacial melt now accounts for an estimated 58% of annual mean discharge, 23% greater than 1998–1999. At Lake Querococha, below Yanamarey (3.4% glacierized), a hydrochemical end-member mixing model estimates that 50% of the streamflow is derived from the glacier catchment. Average concentrations from the Rio Santa leaving the Callejon de Huaylas (...
8
artículo
Original abstract: Sublimation plays a decisive role in the surface energy and mass balance of tropical glaciers. During the dry season (May–September) low specific humidity and high surface roughness favour the direct transition from ice to vapour and drastically reduce the energy available for melting. However, field measurements are scarce and little is known about the performance of sublimation parameterisations in glacier mass balance and runoff models. During 15 days in August 2005 sublimation was measured on the tongue of Glaciar Artesonraju (8°58' S, 77°38' W) in the Cordillera Blanca, Perú, using simple lysimeters. Indicating a strong dependence on surface roughness, daily totals of sublimation range from 1–3 kg m-2 for smooth to 2–5 kg m-2 for rough conditions. (The 15-day means at that time of wind speed and specific humidity were 4.3 m s-1 and 3.8 g kg-1, respectivel...
9
informe técnico
Publicado 2003
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Muestra la evolución del glaciar Shallap,asimismo calcula el balance glaciológico en base a datos hidrometereológicos. Este glaciar esta ubicado en el distrito y provincia de Huaraz, departamento de Áncash.
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informe técnico
Publicado 2003
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Expone la evolución del glaciar Yanamarey, como sensor del cambio climático y fuente de recurso hídrico, asimismo calcula el balance glaciológico en base a datos hidrometereológicos. Este glaciar esta ubicado en el distrito de Catác, provincia de Recuay, departamento de Áncash.
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informe técnico
Publicado 2003
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Evalúa la evolución del glaciar Uruashraju,asimismo calcula el balance glaciológico en base a datos hidrometereológicos. Este glaciar esta ubicado en el distrito de Olleros, provincia de Huaraz, departamento de Áncash.
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informe técnico
Publicado 2003
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Muestra la evolución del glaciar Artesonraju, como sensor del cambio climático y fuente de recurso hídrico, asimismo calcula el balance glaciológico en base a datos hidrometereológicos. Este glaciar esta ubicado en el distrito de Caraz, provincia de Huaylas, departamento de Áncash.
13
artículo
Publicado 2012
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Original abstract: Because the glacier snowline is easy to identify on optical satellite images and because in certain conditions it can be used as an indicator of the equilibrium line, it may be a relevant parameter for the study of the relationships between climate and glaciers. Although several studies have shown that the snowline altitude (SLA) at the end of the hydrological year is a good indicator of the equilibrium-line altitude (ELA) for mid-latitude glaciers, such a relationship remains conjectural for tropical glaciers. Indeed, unlike in mid-latitudes, tropical climate conditions result in a distinct seasonality of accumulation/ablation processes. We examine this relationship using direct field ELA and mass-balance measurements made on Glaciar Zongo, Bolivia (~16° S), vand Glaciar Artesonraju, Peru (~9° S), and the SLA retrieved from satellite images acquired in the past two ...
14
artículo
Publicado 2011
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Original abstract: For the past 30 years, a process of glacier retreat has been observed in the Andes, raising alarm among regional water resources managers. The purpose of this paper is to develop a model of the role of Andean glaciers in the hydrology of their associated watersheds, which is appropriate for application at a river basin scale, with an eye towards creating an analytical tool that can be used to assess the water management implications of possible future glacier retreat. While the paper delves deeply into our formulation of a glacier module within a water resources management modelling system, the widely subscribed Water Evaluation and Planning System (WEAP), the originality of our work lies less in the domain of glaciology and more in how we apply an existing reduced form representation of glacier evolution within a model of the climate-glacier-hydrology-water management...
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artículo
Publicado 2010
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Original abstract: Glaciers in the Cordillera Blanca, Peru, are undergoing rapid retreat, in large part due to climate change. These changes are significantly altering water availability in the region and pose critical risks to local populations that are highly dependent on these resources for livelihoods. We examine these issues through an interdisciplinary and linked evaluation of hydrological change and livelihood vulnerability in the Yanamarey watershed. Physical observations of the Yanamarey glacier show acceleration in frontal retreat at a rate of 8 m decade¿-¿1 since 1970, accompanied by total volume loss on the order of 0.022 km3. Hydrological and hydrochemical analyses document a possible transformation of stream flow over the past decade as the seasonal storage capacity of the glacier has degraded. Recent stream discharge measurements from the proglacial lake below the glacie...
16
artículo
Publicado 2012
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Original abstract: This paper presents a new and easily repeatable method for assessing the susceptibility of glacial lakes to outburst floods (GLOFs) within the Peruvian region of the Cordillera Blanca. The presented method was designed to: (a) be repeatable (from the point of view of the demands on input data), (b) be reproducible (to provide an instructive guide for different assessors), (c) provide multiple results for different GLOF scenarios and (d) be regionally focused on the lakes of the Cordillera Blanca. Based on the input data gained from remotely sensed images and digital terrain models/topographical maps, the susceptibility of glacial lakes to outburst floods is assessed using a combination of decision trees for clarity and numerical calculation for repeatability and reproducibility. A total of seventeen assessed characteristics are used, of which seven have not been used i...
17
artículo
Original abstract: The tropical glaciers of the Cordillera Blanca, Peru, are rapidly retreating, resulting in complex impacts on the hydrology of the upper Río Santa watershed. The effect of this retreat on water resources is evaluated by analyzing historical and recent time series of daily discharge at nine measurement points. Using the Mann-Kendall nonparametric statistical test, the significance of trends in three hydrograph parameters was studied. Results are interpreted using synthetic time series generated from a hydrologic model that calculates hydrographs based on glacier retreat sequences. The results suggest that seven of the nine study watersheds have probably crossed a critical transition point, and now exhibit decreasing dry-season discharge. Our results suggest also that once the glaciers completely melt, annual discharge will be lower than present by 2-30% depending on th...
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artículo
Filiación institucional de autor: Alejo Cochachín Rapre /Autoridad Nacional del Agua - Unidad de Glaciología y Recursos Hídricos (ANA-UGRH), Huaraz, Peru
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objeto de conferencia
Publicado 2020
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The Equilibrium Line Altitude (ELA, m) is a good indicator for the impact of climate change on tropical glaciers , because it varies in time and space depending on changes in temperature and/or precipitation.The estimation of the ELA and paleoELA using the Area x Altitude Balance Ratio method (AABR; Osmaston, 2005) requires knowing the surface and hypsometry of glaciers or paleoglaciers (Benn et al. 2005) and the Balance Ratio (BR) correct (Rea, 2009). In the Llanganuco basin (~ 9°3´S; 77°37´W) there are very well preserved moraines near the current glaciers front. These deposits provide information to reconstruct the extent of paleoglaciers since the Little Ice Age (LIA) and deduce some paleo-climatic variables. The goal of this work has been to reconstruct the paleotemperature (°C) during LIA, deduced from the difference between ELA AABR2016 and paleoELA AABRLIA. The paleoclimatic...
20
artículo
Publicado 2013
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Original abstract: The aim of this paper is to provide the community with a comprehensive overview of the studies of glaciers in the tropical Andes conducted in recent decades leading to the current status of the glaciers in the context of climate change. In terms of changes in surface area and length, we show that the glacier retreat in the tropical Andes over the last three decades is unprecedented since the maximum extension of the Little Ice Age (LIA, mid-17th–early 18th century). In terms of changes in mass balance, although there have been some sporadic gains on several glaciers, we show that the trend has been quite negative over the past 50 yr, with a mean mass balance deficit for glaciers in the tropical Andes that is slightly more negative than the one computed on a global scale. A break point in the trend appeared in the late 1970s with mean annual mass balance per year decr...
