Vitali Diaz

Vitali Diaz
Delft University of Technology | TU · Department of Architectural Engineering & Technology

Doctor of Engineering

About

37
Publications
12,028
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118
Citations
Introduction
I'm currently doing a postdoc at the Delft University of Technology in the research group led by Prof. Peter van Oosterom. The postdoc is within the project “nD-PointCloud continuous level representation for spatio-temporal phenomena in Open Point Cloud Maps”, which is awarded by the Netherlands eScience Center. #followme on twitter @Vitali_DiMe

Publications

Publications (37)
Preprint
Full-text available
Crop yield is one of the variables used to assess the impact of droughts on agriculture. Crop growth models calculate yield and variables related to plant development and become more suitable for crop yield estimation. However, these models are limited in that specific data are needed for computation. Given this limitation, machine learning (ML) mo...
Thesis
Full-text available
Studies of drought have increased in light of new data availability and advances in spatio-temporal analysis. However, the following gaps still need to be filled: 1) methods to characterise drought that explicitly consider its spatio-temporal features, such as spatial extent (area) and pathway; 2) methods to monitor and predict drought that include...
Preprint
Full-text available
In its three-dimensional (3-D) characterization, drought is approached as an event whose spatial extent changes over time. Each drought event has an onset and end time, a location, a magnitude, and a spatial trajectory. These characteristics help to analyze and describe how drought develops in space and time, i.e., drought dynamics. Methodologies f...
Preprint
Full-text available
In its three-dimensional (3-D) characterization, drought is approached as an event whose spatial extent changes over time. Each drought event has an onset and end time, a location, a magnitude, and a spatial trajectory. These characteristics help to analyze and describe how drought develops in space and time, i.e., drought dynamics. Methodologies f...
Preprint
Full-text available
As recommended by Water Resources Research (WRR) journal, the preprint of our paper, is now available on the Earth and Space Science Open Archive (ESSOAr). In collaboration with Dr. Gerald Corzo Perez, Vitali Díaz Mercado, and Dr. Milad Aminzadeh, we have introduced a new drought index "Wet-environment Evapotranspiration and Precipitation Standar...
Article
Full-text available
Drought characterization and risk assessment are of great significance due to drought’s negative impact on human health, economy, and ecosystem. This paper investigates drought characterization and risk assessment in the Lempa River basin in Central America. We applied the Standardized Evapotranspiration Deficit Index (SEDI) for drought characteriz...
Article
Full-text available
Precipitation data are useful for the management of water resources as well as flood and drought events. However, precipitation monitoring is sparse and often unreliable in regions with complicated geomorphology. Subsequently, the spatial variability of the precipitation distribution is frequently represented incorrectly. Satellite precipitation da...
Article
Full-text available
The spatiotemporal monitoring of droughts is a complex task. In the past decades, drought monitoring has been increasingly developed, while the consideration of its spatio-temporal dynamics is still a challenge. This study proposes a method to build the spatial tracks and paths of drought, which can enhance its monitoring. The steps for the drought...
Article
Open access via TUDelft repository (https://repository.tudelft.nl/islandora/object/uuid:4acce8f6-ebd4-454f-ad06-9daac5e35637/datastream/OBJ/download) Drought is a complex natural phenomenon. The description of the way in which drought changes (moves) in space may help to acquire knowledge on its drivers and processes to improve its monitoring and...
Chapter
Full-text available
PDF via TUDelft repository [https://pure.tudelft.nl/ws/portalfiles/portal/117825973/3_s2.0_B9780128116890000070_main.pdf] Drought indicators are of critical importance in characterization and forecasting. The use of the Standardized Precipitation Index (SPI) has increasingly become the main tool for drought analysis; however, the index lacks hydrol...
Article
Full-text available
This study highlights the advantage of satellite-derived rainfall products for hydrological modeling in regions of insufficient ground observations such as West African basins. Rainfall is the main input for hydrological models; however, gauge data are scarce or difficult to obtain. Fortunately, several precipitation products are available. In this...
Chapter
PDF via TUDelft repository [https://pure.tudelft.nl/ws/portalfiles/portal/116645602/3_s2.0_B9780128116890000033_main.pdf] Extreme hydrological events (EHEs), such as droughts and floods, vary spatially and temporally in nature. The increase in the number of events in the last few decades has motivated the research of the spatiotemporal variabilit...
Chapter
PDF via TUDelft repository [https://pure.tudelft.nl/ws/portalfiles/portal/117826537/3_s2.0_B9780128116890000045_main.pdf] Understanding, characterizing, and predicting drought is vital for the reduction of its consequences. In the last few decades, many studies have moved drought analysis from the conventional lumped approach to a more spatiotempor...
Conference Paper
Full-text available
Distributed hydrological simulations aid to investigate the spatio-temporal behaviour of hydrological variables. However, data to feed hydrological models are not always available mainly due to lack of gauges or high retrieval fees. In this research, two 0.25- degree daily precipitation databases from the Tropical Rainfall Measuring Mission (TRMM)...
Conference Paper
Full-text available
Due to the underlying characteristics of drought, monitoring of its spatio-temporal development is difficult. Last decades, drought monitoring have been increasingly developed, however, including its spatio-temporal dynamics is still a challenge. This study proposes a method to monitor drought by tracking its spatial extent. A methodology to build...
Conference Paper
Full-text available
Given the difficulty to access gauge data, satellite-based rainfall is available for use in hydrological modelling. We investigate the performance of PERSIANN-CDR over the Bani River Basin (Upper Niger and four sub basins of the Upper Senegal River. PERSIANN-CDR data was compared with rain gauges of 11 synoptic stations. In addition, CEQUEAU distri...
Conference Paper
Full-text available
Currently, large-scale drought monitoring is carried out through the implementation of different drought indicators that use both remote sensing and ground-based data. Among the most promising are those that use remote sensing data variables, principally soil moisture (SM) and evaporation (E), because of their link with agricultural drought impacts...
Data
This tool performs the Non-Contiguous Drought Analysis (NCDA) proposed by Corzo Perez et al. (2011 HESS), on a monthly basis. Furthermore, it computes drought characteristics (i.e., Duration, Severity and Intensity=D/S) from one arrangement (rows x cols x time) containing drought indicator values. The latest update of the STAND toolbox can be obta...
Conference Paper
Full-text available
Big data is a growing area of science where hydroinformatics can benefit largely. There have been a number of important developments in the area of data science aimed at analysis of large datasets. Such datasets related to water include measurements, simulations, reanalysis, scenario analyses and proxies. By convention, information contained in the...
Article
Full-text available
Hydrological studies need an essential forward movement in the area of spatiotemporal modelling and data analysis. During the last years, there has been a significant increase in global spatial data available from different sources. This considerable amount of data is creating the need for a change in how to approach the spatiotemporal analyses of...
Research Proposal
Full-text available
Droughts are becoming more intense and severe, causing more deaths than other hazards in the past century. Therefore, to face up drought impacts with the optimal strategies, it is necessary a better understand of the drought phenomenon. There are hydrological studies that investigate the processes that govern the genesis and development of the drou...
Poster
Full-text available
In the context of the water-related SDGs, goal 11.5 is proposed to reduce the number of deaths and the number of affected people by water-related disasters (WRD). In this regard, one of the main challenges in the implementation agenda of SDGs is to have tools, data, and indicators that help to achieve the goals mentioned. In this subject, the prese...
Code
Note: Before downloading, please check the latest update at https://github.com/hydroinfo4x/STAND-LS. STAND_LS_NCDA.m performs the Non-Contiguous Drought Analysis (NCDA) proposed by Corzo et al. (2011 HESS), on a monthly basis. Furthermore, it computes drought characteristics (i.e., Duration, Severity and Intensity=D/S) from one arrangement (rows x...
Data
Please check the latest update at https://github.com/hydroinfo4x/STAND-LS.
Code
Note: Before downloading, please check the latest update at https://github.com/hydroinfo4x/STAND-LS. STAND_LS_NCDA.m performs the Non-Contiguous Drought Analysis (NCDA) proposed by Corzo et al. (2011 HESS), on a monthly basis. Furthermore, it computes drought characteristics (i.e., Duration, Severity and Intensity=D/S) from one arrangement (rows x...
Presentation
Full-text available
This presentation shows some results of the application of STAND_LS_NCDA.m. The latest update of the STAND toolbox can be obtained at https://github.com/hydroinfo4x/STAND-LS.
Article
Full-text available
p>Lately, drought is more intense and much more severe around the globe, causing more deaths than other hazards in the past century. Drought can be characterized quantitatively for its spatial extent, intensity and duration by using drought indicators. Several indicators have been developed in order to characterize drought, being the most widesprea...
Article
Full-text available
Hydrological modeling is an essential tool to evaluate water resources in hydrological basins. The time invested in it depends on the structure of the hydrological model chosen, the amount and quality of information required and the efforts invested in calibration. CEQUEAU is a distributed hydrological model developed at the INRS-ETE, Quebec, Canad...
Conference Paper
Full-text available
Se muestra la aplicación de un sistema Hidroestimador (HE) desarrollado por el Instituto de Ingeniería de la Universidad Nacional Autónoma de México (II-UNAM), dentro del marco del Plan Hídrico Integral de Tabasco. El sistema HE se aplicó para el cálculo de las láminas de lluvia en cuatro subcuencas del río La Sierra (Tabasco, México), las cuales s...
Presentation
Full-text available
Se muestra la aplicación de un sistema Hidroestimador (HE) desarrollado por el Instituto de Ingeniería de la Universidad Nacional Autónoma de México (II-UNAM), dentro del marco del Plan Hídrico Integral de Tabasco. El sistema HE se aplicó para el cálculo de las láminas de lluvia en cuatro subcuencas del río La Sierra (Tabasco, México), las cuales s...
Thesis
Full-text available
En el estado de Sonora, el crecimiento de la ciudad de Hermosillo, así como la intensa actividad agrícola de las planicies de la cuenca baja, plantean un conflicto de sobreexplotación de las fuentes superficiales y subterráneas, lo cual implica la demanda creciente de volúmenes que difícilmente podrán ser satisfechos con el manejo actual de las fue...
Conference Paper
Full-text available
En este trabajo se presenta el análisis de recarga vertical en el Acuífero del Valle de Toluca, donde el objetivo de esta investigación fue estimar la recarga vertical debida a precipitación, tomando en cuenta las características topográficas, climatológicas, de tipo y uso de suelo; también se evaluó la contribución de origen antrópico y las de los...
Thesis
Full-text available
La modelación hidrológica es una herramienta esencial en la evaluación de los recursos del agua en las cuencas hidrológicas, el tiempo invertido para tal propósito depende de la estructura del modelo hidrológico elegido, de la cantidad y calidad de la información requerida y de los esfuerzos invertidos en la calibración. El modelo CEQUEAU es un mod...
Thesis
Full-text available
Esta tesis es producto del proyecto de investigación titulado “Evaluación del estado límite de vibraciones de un puente vehicular del Estado de México con base en confiabilidad”, clave UAEM261/2006U, desarrollado en la Facultad de Ingeniería de la Universidad Autónoma del Estado de México. La selección del puente que se estudia se debió por una par...

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Projects

Projects (3)
Project
Development and application of hydrological models and tools with ground-based and remote-sensing inputs.
Project
BSc thesis: Statistical analysis and probabilistic modeling of the variables involved in the reliability analysis of a vehicular bridge. MSc thesis: Geomatics-based design of the hydrological model CEQUEAU for (quasi-)natural basins. PhD thesis: Spatio-temporal analysis of drought: integrating data-driven and process-based models (in progress)
Project
Even though there is no conventional definition of drought, since factors involved are multiple and diverse, it is generally described as a result of anomalous precipitations and temperatures in a given region. These water anomalies move further in space and time via the terrestrial hydrological cycle producing additional shortages on soil moisture, groundwater, and runoff. STAND aims to unravel the mechanisms by which drought propagates to have a better characterisation of a drought event, i.e., higher accuracy in the calculation of its onset, duration, intensity, and spatial trajectory. We explore both process-based and machine learning models and their integration in this research.