Browsing by Author "Khachatryan, Aleksandr"

Now showing 1 - 3 of 3

Análisis comparativo de la influencia del caudal base de las subcuencas de los ríos Machángara, Tarqui y Yanuncay en el caudal base del río Paute durante el periodo de estiaje de los años 2009 a 2011
(Universidad de Cuenca, 2020-01-02) Quezada Ochoa, Christian Andrés; Quizhpi Calle, María del Carmen; Khachatryan, Aleksandr; Guzmán Cárdenas, Pablo Ismael
Drying is a natural phenomenon that is manifest through rainfall below normal limits with duration, frequency and severity difficult to predict (Pacheco, Parra, & Avilés, 2017). During the dry season, the flow of the rivers comes mainly from the flow of groundwater (base flow). In the period 2009 to 2011 Ecuador went through different critical dry seasons, affecting the country's electricity generation. The Paute Hydroelectric Complex was also affected due to the low level of its reservoir, whose main tributary is the Paute river; and with it the water supply of the sub-basins that converge in it. Therefore, the objectives of this study are to know how in that period the base flow of the Paute river was influenced by the sub-basin of the Machángara river with artificial regulation in relation to the sub-basins of the Tarqui and Yanuncay rivers in which there is only natural regulation, and to carry out a comparative analysis of the characteristics associated with the base flow rate between them, through the use of non-linear recession analysis and digital filters. The sub-basin of the Machángara river during the analysis period contributed with 15% of base flow to the middle basin of the Paute river, in relation to the sub-basins of the Tarqui and Yanuncay rivers with 6% and 12% respectively. Also, its storage capacity was higher compared to the other sub-basins, a condition that may be due to existing reservoirs in the area. This study constitutes a hydrological analysis tool for the adequate arrangement and management of the water resource through the understanding of the physical characteristics associated with the base flow in sub-basins with natural and artificial regulation in the Andean region of Ecuador, especially in the Paute river basin.
Análisis comparativo de los factores determinantes en la susceptibilidad geodinámica de dos microcuencas en el sector Marianza
(Universidad de Cuenca, 2023-08-04) Chaca Cordero, José Luis; Rea Avila, Juan Alexander; Tobar Solano, Vladimiro Alexis; Khachatryan, Aleksandr; Ramírez Matamoros, Marco Tulio
In March 2022, a debris flow in the Sayausí-Cuenca parish caused damage to infrastructure and loss of human lives. This event highlighted the need to understand the contributing factors to its occurrence. This research focused on determining these factors and assessing the susceptibility of two micro-watersheds to debris flow in the Marianza sector. Activities included geological and geomorphological characterization, soil classification, analysis of precipitation, rainfall-runoff modeling, and mapping of debris flow susceptibility using the RES methodology. The results revealed the accumulation of material composed of gravel, sand, and clayey silt in the upper parts of the microwatersheds with a high capacity to flow in a saturated state. The presence of a shallow rocky layer with low permeability and concave surfaces in the upper areas was also identified. Furthermore, there was evidence of loss of vegetative cover and expansion of agricultural activities. March 2022 was the rainiest month in 19 years, with a maximum intensity of 42 mm/h and a return period of 30 years. Rainfall-runoff models indicated flow rates exceeding 250 L/s in the upper parts of the micro-watersheds. This study provided valuable information on the determining factors for debris flow occurrence and the susceptibility of micro-watersheds in the Marianza sector, which could aid in the implementation of prevention and risk management measures in the future. Detailed discussions and conclusions are presented in subsequent sections of this research work.
Análisis multitemporal del cambio de uso de suelo e identificación de la fragmentación del paisaje mediante técnicas de percepción remota en el peri-urbano de la ciudad Cuenca
(Universidad de Cuenca, 2020-10-26) Astudillo Jara, Sandro Israel; Khachatryan, Aleksandr
The city of Cuenca is the cantonal capital and capital of the Azuay province. The periurban zone, considered as a transition zone between the city and the rural area, is being affected by the process of expansion of the city towards the rural area due to the uncontrolled growth of the urbanizations, thus losing: vegetation, forests and own agricultural activities of the area. This reality gives way to complications in the coverage and use of land and alterations in the landscape. In this work, Landsat 7 ETM + and Landsat 8 OLI / TIRS satellite images were obtained and preprocessed, and then the supervised classification was performed using spectral analysis. All the results obtained were validated using the Kappa index and a field analysis. Subsequently, the analysis of landscape metrics and fragmentation indices was performed to identify the categories within the urban and peri-urban area that have been most affected. Finally, the spatio-temporal projection of the changes in coverage, land use and landscape fragmentation were carried out for the years 2030 and 2050. It was identified that the city of Cuenca is indeed spreading towards the peripheries due to the great urban expansion caused mainly by population growth, since by 2016 the category of “Human Settlements / Uncovered Land” came to represent 49.95% of all urban and peri-urban surface. Therefore, there was an increase in the total area of this category of 16.79%, which represents an annual growth rate of 1.12%. On the other hand, there was a considerable decrease in the other two categories with an annual rate of 0.98% for the category "Crops / Vegetation / Pastures" and 0.21% for the category "Forests". When projecting the change in land cover and use for the years 2030 and 2050, it was possible to identify that the category “Human Settlements / Open Land” will continue to increase its surface within the landscape and therefore there will be a decrease in the surface of other categories.