Browsing by Author "Aedo, Sebastián"

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    Towards a Drought Monitoring, Tracking, and Management Platform Based on Quantitative Indices
    (2025) Gironás, Jorge; Núñez, Marialina; Vicuña, Sebastián; Aedo, Sebastián; Morales, David; Vargas, Javier; Guzmán, Juan de Dios; Suárez, Francisco
    Drought is a complex phenomenon that affects the development and use of the country’s water resources. Characterization through indices is critical in planning, management, and decision-making to mitigate the effects of drought, mainly when these are implemented in online platforms for monitoring, warning, and tracking the phenomenon. These tools serve as a basis for implementing a set of measures focused on the short, medium, and long term, oriented to different audiences, and with differentiation of procedures and entities involved depending on the case. This work proposes the technical basis for elaborating preventive drought monitoring in Chile through a visualization platform. Based on a comparative analysis of international tools and the results of a consultation with experts, the relevant characteristics of a system for drought monitoring, follow-up, and management based on standardized drought indexes are analyzed. It is concluded that such a platform should consider multiple drought indices with different levels of severity for their classification. These indices should be automatically calculated using as much information as possible, both from national and international sources, from in-situ gauges as well as from satellite and remote sensing products, and even obtained from modeling. On the other hand, the visualization should be simple, straightforward, and flexible, and the information delivered should provide information on the manifestation of drought in the territory and its short-term forecast.
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    Using a robust decision making (RDM) approach to explore current and future vulnerabilities of a semi-arid coastal basin: a case study of the Quilimarí basin in Chile
    (2025) Poblete López, David Nicolás; Vicuña Díaz, Sebastián; Aedo, Sebastián; Molina-Pérez, Edmundo; Cortés, Hermilo; Melo Contreras, Óscar; Ocampo-Melgar, Anahí; Tesen Arambulo, Kiara Aimee; Suárez Poch, Francisco Ignacio; Herane Espinosa, Juan Pablo; Meza, Francisco Javier; Duarte Becerra, Katherine Mariela; González Santander, Diego Nicolás; Leray, Sarah; Williams, Megan Elizabeth; Gaxiola, Aurora; Alfaro, Gabriela; Morales Moraga, David Alejandro
    Climate change, land use alterations, human activities, and regulatory frameworks all contribute to deep uncertainties that define water security in hydrological basins. This is particularly significant in drylands where water scarcity limits agricultural productivity. Robust Decision Making (RDM) is an effective approach for identifying strategies that perform well under uncertainty across a wide range of possible futures. One of RDM’s key strengths is its ability to guide decisions without relying on precise future predictions, emphasizing robustness rather than optimality. This study focuses on the Quilimarí River basin, located in the semi-arid coastal region of Chile, where groundwater is the primary water source. Small coastal communities rely on shallow boreholes, which have become brackish due to saline intrusion. We present the initial stages of implementing an RDM process with key local decisionmakers to explore the expected impacts of socio-hydrological stressors and uncertainties on the main water-dependent objectives. Different levels and approaches of participation during the 2 years of RDM process enabled the identification of critical concerns raised by local stakeholders and government agencies, the uncertainties likely to affect these issues, and potential actions for improving outcomes. To explore current and future vulnerabilities we used a WEAP-MODFLOW water resources model that integrates data on extraction wells, irrigation schemes, agricultural production, potable water supply, and associated costs, including saline intrusion processes. The model simulates trade-offs between different objectives, such as groundwater extraction for agriculture and job creation versus potable water for rural communities. The vulnerability exploration scenarios suggest a complex future, with up to a 40% reduction in precipitation and increased water demand from household and tourism use. To cope with the impacts associated with these global change scenarios a series of adaptation options were tested. Overall, desalination emerged as a favorable option for local human consumption demands, although tested only under basin-level metrics. This study illustrates valuable insights on how the water management strategies under uncertainty can benefit from local engagement towards testing robust decisions in arid and semi-arid coastal basis around the world.