Rolando Célleri

Rolando Célleri
University of Cuenca | UC · Departamento de Recursos Hídricos y Ciencias Ambientales

PhD in Engineering (Hydrology)

About

113
Publications
81,537
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Introduction
Rolando Célleri currently works at the Departamento de Recursos Hídricos y Ciencias Ambientales, University of Cuenca. Rolando does research in hydrology, hydrometeorology and ecosystem services. His projects are related to hydrological forecasting and ecohydrological processes in high andean catchments.
Additional affiliations
August 2019 - present
University of Cuenca
Position
  • Professor
July 2013 - July 2019
University of Cuenca
Position
  • Head of Department

Publications

Publications (113)
Article
Full-text available
Discharge forecasting is a key component for early warning systems and extremely useful for decision makers. Forecasting models require accurate rainfall estimations of high spatial resolution and other geomorphological characteristics of the catchment, which are rarely available in remote mountain regions such as the Andean highlands. While radar...
Conference Paper
Full-text available
Flood Early Warning Systems have globally become an effective tool to mitigate the adverse effects of this natural hazard on society, economy and environment. A novel approach for such systems is to actually forecast flood events rather than merely monitoring the catchment hydrograph evolution on its way to an inundation site. A wide variety of mod...
Article
Full-text available
Accurate determination of the water retention curve (WRC) of a soil is essential for the understanding and modelling of the subsurface hydrological, ecological, and biogeochemical processes. Volcanic ash soils with andic properties (Andosols) are recognized as important providers of ecological and hydrological services in mountainous regions worldw...
Article
Full-text available
Actual evapotranspiration (ETa) explains the exchange of water and energy between soil, land surface, and atmosphere. Despite its importance, it remains difficult to measure directly. Grasslands represent a widespread ecosystem for which further assessment of the measurement and estimation of ETa is needed. Thus, the objective of this study was to...
Article
Andean ecosystems provide important hydrological services for downstream communities. Due to this importance, several hydrological studies have been carried out in recent years, with emphasis on hydrological processes identification and land use change impacts. In several studies, but also for the operation of small-scale irrigation and drinking wa...
Article
Full-text available
In this study, precipitation in Tropical South America in the 1931–2016 period is investigated by means of Principal Component Analysis and composite analysis of circulation fields. The associated dynamics are analyzed using the 20th century ERA-20C reanalysis. It is found that the main climatic processes related to precipitation anomalies in Tropi...
Article
In high-altitude Andean grasslands (páramo), overgrazing leads to alterations in both vegetation and microclimate. These alterations need to be identified to devise land management strategies that will preserve and enhance ecosystem processes. To elucidate this issue, we designed an overgrazing experiment: we selected two plots covered with native...
Article
Full-text available
Páramos are particular ecosystems of the Tropical Andes, where fog and low-intensity rainfall such as drizzle are commonly frequent—but the contribution of these water sources to soil water replenishment and discharge is not yet clear, mainly because the development of techniques for separating fog from drizzle and wind-driven rainfall has been cha...
Article
Full-text available
The coastal regions of South Ecuador and Peru belong to the areas experiencing the strongest impact of the El Niño Southern Oscillation phenomenon. However, the impact and dynamic development of weather patterns during those events are not well understood, due to the sparse observational networks. In spite of neutral to cold conditions after the de...
Article
Understanding precipitation and its relation with atmospheric and oceanic conditions is vital in the face of climate change. This is crucial in the Tropical Andes (TA) because millions of people depend on water originated in the cordillera. Unfortunately, the paucity of meteorological monitoring that exists in mountainous regions is accentuated in...
Article
The computation of the reference crop evapotranspiration (ETo) using the FAO56 Penman-Monteith equation (PM-ETo) requires data on maximum and minimum air temperatures (Tmax, Tmin), relative humidity (RH), solar radiation (Rs), and wind speed (u2). However, the records of meteorological variables are often incomplete or of poor quality. Frequently,...
Article
Full-text available
Worldwide, machine learning (ML) is increasingly being used for developing flood early warning systems (FEWSs). However, previous studies have not focused on establishing a methodology for determining the most efficient ML technique. We assessed FEWSs with three river states, No-alert, Pre-alert and Alert for flooding, for lead times between 1 to 1...
Preprint
Full-text available
Flood Early Warning Systems (FEWSs) using Machine Learning (ML) has gained worldwide popularity. However, determining the most efficient ML technique is still a bottleneck. We assessed FEWSs with three river states, No-alert, Pre-alert, and Alert for flooding, for lead times between 1 to 12 hours using the most common ML techniques, such as Multi-L...
Preprint
Full-text available
Extreme runoff modeling is hindered by the lack of sufficient and relevant ground information and the low reliability of physically-based models. The authors propose to combine precipitation Remote Sensing (RS) products, Machine Learning (ML) modeling, and hydrometeorological knowledge to improve extreme runoff modeling. The approach applied to imp...
Presentation
Full-text available
El pastoreo en el páramo andino cambia de manera progresiva las características del pajonal, y consecuentemente ocasiona variaciones en el microclima; tales variaciones pueden ser permanentes cuando se excede el umbral de recuperación e influir en el clima local. La gestión basada en evidencia sobre la capacidad de recuperación ecosistémica evitarí...
Article
Full-text available
La medición de la cobertura vegetal es fundamental para conocer qué porcentaje de la precipitación queda interceptada sobre la misma. Las técnicas más utilizadas para medir la cobertura in situ son el índice de área foliar (IAF) y la densidad del dosel (DD). Sin embargo, no se ha puesto atención en las diferencias registradas en el uso de las dos t...
Conference Paper
Full-text available
Current efforts on Deep Learning-based modeling are being put for solving real world problems with complex or even not-fully understood interactions between predictors and target variables. A special artificial neural network, the Long Short-Term Memory (LSTM) is a promising data-driven modeling approach for dynamic systems yet little has been expl...
Preprint
Full-text available
Short-rain floods, especially flash-floods, produce devastating impacts on society, the economy, and ecosystems. A key countermeasure is to develop Flood Early Warning Systems (FEWSs) aimed at forecasting flood warnings with sufficient lead time for decision making. Although Machine Learning (ML) techniques have gained popularity among hydrologists...
Article
In tropical highlands of the northern Andes, known as páramos, fog incidence is very frequent. Its quantification is not yet clear, mostly because of the complexity of distinguishing between fog and low‐intensity rainfall. Moreover, there is uncertainty about the performance of the various types of gauges used to capture fog in this ecosystem. This...
Article
Full-text available
Lack of rainfall information at high temporal resolution in areas with a complex topography as the Tropical Andes is one of the main obstacles to study its rainfall dynamics. Furthermore, rainfall types (e.g., stratiform, convective) are usually defined by using thresholds of some rainfall characteristics such as intensity and velocity. However, th...
Article
Full-text available
The Random Forest (RF) algorithm, a decision-tree-based technique, has become a promising approach for applications addressing runoff forecasting in remote areas. This machine learning approach can overcome the limitations of scarce spatio-temporal data and physical parameters needed for process-based hydrological models. However, the influence of...
Chapter
Floods and droughts are among the most common natural hazards worldwide. They produce major impacts on society, economy, and ecosystems. Even worst, the frequency and severity of hydrological extremes are expected to increase with climate change and land-use alteration. As a countermeasure, during last decades, implementation of flood and drought f...
Conference Paper
Full-text available
Hydropower generation in Ecuador is vital for its economic development. However, hydropower production is not optimal due to the lack of hydrological forecasting tools. Therefore, dam operators cannot anticipate the incoming discharge and thus optimize the energy generation schedule, producing significant economic losses. The difficulties for devel...
Article
Full-text available
Radar-based rainfall information has been widely used in hydrological and meteorological applications, as it provides data with a high spatial and temporal resolution that improve rainfall representation. However, the broad diversity of studies makes it difficult to gather a condensed overview of the usefulness and limitations of radar technology a...
Conference Paper
Full-text available
Text: The páramo biome provides key ecosystem services in the Andes. Water resources from the páramo are used for drinking water, irrigation, hydropower generation and for sustaining aquatic ecosystems. Notwithstanding mountainous terrains place di culties for their study, due to its remoteness and data scarcity, knowledge about the functioning of...
Technical Report
Full-text available
Los cambios en el uso del suelo y cobertura de la tierra son las principales razones de la alteración hidrológica en los Andes tropicales. Sin embargo, cuantificar sus impactos resulta complicado debido a la diversidad extrema de condiciones meteorológicas, lo que se combina con el vacío de conocimiento acerca de los procesos hidrológicos a escala...
Article
Full-text available
The 2015–2016 El Niño event ranks as one of the most severe on record in terms of the magnitude and extent of sea surface temperature (SST) anomalies generated in the tropical Pacific Ocean. Corresponding global impacts on the climate were expected to rival, or even surpass, those of the 1997–1998 severe El Niño event, which had SST anomalies that...
Article
Full-text available
Efforts to correct precipitation measurements have been ongoing for decades, but are scarce for tropical highlands. Four tipping-bucket (TB) rain gauges with different resolution that are commonly used in the Andean mountain region were compared—one DAVIS-RC-II, one HOBO-RG3-M, and two TE525MM TB gauges (with and without an Alter-Type wind screen)....
Article
Full-text available
Por décadas se ha trabajado para corregir las medidas de precipitación, sin embargo estos esfuerzos han sido esca-sos en zonas tropicales montañosas. Cuatro pluviómetros de balancín (TB), con distinta resolución y comúnmenteutilizados en las montañas de los Andes, fueron comparados en este estudio: un DAVIS-RC-II, un HOBO-RG3-M, ydos TE525MM (con y...
Article
Full-text available
The problem of discharge forecasting using precipitation as input is still very active in Hydrology, and has plethora of approaches to its solution. But, when the objective is to simulate discharge values without considering the phenomenology behind the processes involved, Artificial Neural Networks, ANN give good results. However, the question of...
Article
The study of the environmental factors that control evapotranspiration and the components of evapotranspiration leads to a better understanding of the actual evapotranspiration (ET) process that links the functioning of the soil, water and atmosphere. It also improves local, regional and global ET modelling. Globally, few studies so far focussed on...
Article
Full-text available
In remote areas with steep topography, such as the Tropical Andes, reliable precipitation data with a high temporal resolution are scarce. Therefore, studies focusing on the diurnal properties of precipitation are hampered. In this paper, we investigated two years of data from Micro-Rain Radars (MRR) in Cuenca, Ecuador, and Huaraz, Peru, from Febru...
Article
Full-text available
In remote areas with steep topography, such as the Tropical Andes, reliable precipitation data with a high temporal resolution are scarce. Therefore, studies focusing on the diurnal properties of precipitation are hampered. In this paper, we investigated two years of data from Micro-Rain Radars (MRR) in Cuenca, Ecuador, and Huaraz, Peru, from Febru...
Article
Interest in atmosphere-surface flux modeling over the mountainous regions of the globe has increased recently, with a major focus on the prediction of water, carbon and other functional indicators in natural and disturbed conditions. However, less research has been centered on exploring energy fluxes (net radiation; sensible, latent and soil heat)...
Preprint
Full-text available
The 2015–16 El Niño event ranks as one of the most severe on record in terms of the magnitude and extent of sea surface temperature (SST) anomalies generated in the tropical Pacific Ocean. Corresponding global impacts on the climate were expected to rival, or even surpass, those of the 1997–98 severe El Niño event, which had SST anomalies that were...
Conference Paper
Full-text available
At the Andean region, the páramo biome (located above 3200 m a.s.l.) provides water resources for many cities and communities along Central and South America. These resources are used for drinking water, agriculture, hydropower generation and for sustaining aquatic ecosystems. Although mountainous terrains place difficulties for their study, due to...
Article
Land use impacts on soil water content (SWC) are scarcely studied in mountain humid ecosystems, such as the Andean páramos, despite its influence on ecohydrological processes. Our objective was to analyze the impacts of extensive grazing on SWC of an Andean páramo hillslope with native tussock grasses. Along two parallel transects in a hillslope, w...
Article
Full-text available
Despite many efforts of the radar community, quantitative precipitation estimation (QPE) from weather radar data remains a challenging topic. The high resolution of X-band radar imagery in space and time comes with an intricate correction process of reflectivity. The steep and high mountain topography of the Andes enhances its complexity. This stud...
Research
Full-text available
Los ecosistemas andinos, en especial el páramo y los bosques montanos, son reconocidos por los múltiples servicios ambientales que prestan, los cuales varían desde aspectos culturales, escénicos, recreacionales y de generación de energía hidroeléctrica, hasta otros como la purificación del aire y reciclado de nutrientes, siendo el principal la prov...
Conference Paper
Full-text available
The study of land surface-atmosphere flux exchanges for mountainous regions has increased in the last decade. However, the prediction of water losses and energy fluxes in natural and disturbed environments of highland biomes is still unexplored. This is the case of the Neotropical Andean biome of the páramo, where this lack of research is noticeabl...
Conference Paper
Full-text available
The páramo ecosystem provides most of the water for the tropical Andean highlands in South America. Thus, the proper closure of the water balance in this environment is of outmost importance. Although actual evapotranspi-ration (ETa) is a key component of the water balance, it has not been properly assessed at the páramo. ETa has been recently meas...
Article
Full-text available
High-elevation tropical grassland systems, called Páramo, provide essential ecosystem services such as water storage and supply for surrounding and lowland areas. Páramo systems are threatened by climate and land use changes. Rainfall generation processes and moisture transport pathways influencing precipitation in the Páramo are poorly understood...
Conference Paper
Full-text available
Flash-flood and drought forecasting has emerged worldwide due to the catastrophic socio-economical impacts these hazards might cause and the expected increase of their frequencies in the future. In mountainous areas, drought and flash-flood forecasting is challenging considering that information other than precipitation and discharge is not commonl...
Article
Atmospheric carbon (CO2) exchange, evapotranspiration (ET) processes, and their interactions with climatic drivers across tropical alpine grasslands are poorly understood. This lack of understanding is particularly evident for the páramo, the highest vegetated frontier in the northern Andes, the main source of water for inter-Andean cities, and a l...
Article
Full-text available
Flash-flood forecasting has emerged worldwide due to the catastrophic socio-economic impacts this hazard might cause and the expected increase of its frequency in the future. In mountain catchments, precipitation-runoff forecasts are limited by the intrinsic complexity of the processes involved, particularly its high rainfall variability. While pro...
Article
Full-text available
Pronóstico de la ocurrencia de precipitación diaria en un gradiente altitudinal en el Sur del Ecuador, mediante un generador climático (Forecasting of daily precipitation occurrence in an altitudinal gradient in southern Ecuador using a weather generator) Resumen: El pronóstico de precipitación es fundamental para mejorar la gestión de los recursos...
Article
We demonstrated the great value of spatially distributed and temporally high-resolution hydro-chemical data to enhance knowledge about the intra-catchment variability of flow processes and the runoff composition of individual storms in a tropical alpine (Páramo) ecosystem. In this study, water sources (rainfall, spring water, and water from soil la...
Article
Full-text available
In places with high spatiotemporal rainfall variability, such as mountain regions, input data could be a large source of uncertainty in hydrological modeling. Here we evaluate the impact of rainfall estimation on runoff modeling in a small páramo catchment located in the Zhurucay Ecohydrological Observatory (7.53 km2) in the Ecuadorian Andes, using...
Article
Full-text available
Mesoscale convective systems (MCSs) climatology, the thermodynamic and dynamical variables, and teleconnections influencing MCSs development are assessed for the Paute basin (PB) in the Ecuadorian Andes from 2000 to 2009. The seasonality of MCSs occurrence shows a bimodal pattern, with higher occurrence during March-April (MA) and October-November...
Article
Full-text available
This article presents a hydrometeorological dataset from a network of paired instrumented catchments, obtained by participatory monitoring through a partnership of academic and non-governmental institutions. The network consists of 28 headwater catchments (o 20 km 2) covering three major biomes in 9 locations of the tropical Andes. The data consist...
Poster
Full-text available
A laser-optical disdrometer served as reference to assess the absolute percent bias of calculated rainfall intensity using the data of different-resolution tipping-bucket rain gauges classically applied by climatologists and hydrologists in the Andean region. Additionally, the impact of the calculation method (tip counting versus cubic spline inter...
Article
The páramo ecosystem provides most of the water for the tropical Andean highlands in South America. While the comprehension of this environment has increased lately, there remains an urgent need to quantify the processes involved in the hydrological cycle. Interception loss (IL) is one of the least studied processes in the páramo, and more generall...
Article
Full-text available
In response to increasing pressures on water resources, watershed-services management programs are implemented throughout the tropics. These programs aim to promote land management activities that enhance the quantity and quality of water available to local communities. The success of these programs hinges on our ability to i) understand the impact...
Article
Information on the spatiotemporal rainfall occurrence, its microphysical characteristics, and its reflectivity-rainfall (Z-R) relations required to provide rainfall mapping based on rain radar data is limited for tropical high mountains. Therefore, this study aims to analyze rainfall types in the Andes cordillera to derive different rain-type Z-R r...
Article
The relative importance of catchment's water provenance and flow paths varies in space and time, complicating the conceptualization of the rainfall-runoff response. We assessed the temporal dynamics in source areas, flow paths and age by End Member Mixing Analysis (EMMA), Hydrograph Separation (HS) and Inverse Transit Time Proxies (ITTPs) estimatio...
Conference Paper
Full-text available
The páramo, known as the “water tower” of northern South America, is a high-elevation tropical ecosystem that develops above the tree line and below the perennial snow line. As such, and due to its rapid reaction to environmental changes, this ecosystem can provide valuable information as an early indicator of global change. It consists of a series...