Learning from hydrological and hydrogeological problems in civil engineering. Study of reservoirs in Andalusia, Spain

Ruiz-Ortiz, Verónica; García-López, Santiago; Vélez-Nicolás, Mercedes; Bellón, Ángel Sánchez; Villar, Antonio Contreras de; Contreras, Francisco Ganga

doi:10.1016/j.enggeo.2020.105916

Cited by 9 publications

(3 citation statements)

References 66 publications

(69 reference statements)

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“…The average annual temperature is 18.2 • C, with milder values in mountainous areas. The area is strongly affected by intense and persistent periods of warm, dry easterly winds known as Levante, which can reach speeds over 100 km/h and blow for more than 7 consecutive days, resulting in significant evaporation processes on surface resources [42,43]. The economy in the basin is mainly based on agriculture and livestock farming, activities that are highly dependent on the supply of surface water from the reservoirs Barbate, Celemín and Almodóvar (joint capacity of 277 hm 3 ) and, to a lesser extent, on the exploitation of local aquifers [44].…”

Section: Case Study: Climate and Contextmentioning

confidence: 99%

Precipitation Variability and Drought Assessment Using the SPI: Application to Long-Term Series in the Strait of Gibraltar Area

Vélez-Nicolás

García-López

Ruiz-Ortiz

et al. 2022

Water

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The standardized precipitation index (SPI) provides reliable estimations about the intensity, magnitude and spatial extent of droughts in a variety of time scales based on long-term precipitation series. In this work, we assess the evolution of monthly precipitation in the Barbate River basin (S. Iberian Peninsula) between 1910/11 and 2017/18 through the generation of a representative precipitation series for the 108-year period and the subsequent application of the SPI. This extensive series was obtained after processing all the precipitation data (67 stations) available within and nearby the basin and subsequent complex gap-filling stages. The SPI identified 26 periods of drought, 12 of them severe and 6 extreme, with return periods of 9 and 18 years, respectively. Complementary analysis evidenced changes in precipitation cyclicity, with periodicities of 5 and 7–8 years during the first and second half of the study period, respectively. Additionally, the amplitude of pluviometric oscillations increased during the second half of the period, and extreme events were more frequent. While the decade 1940–1950 was very dry, with precipitation 11% below the basin’s average, 1960–1970 was very humid, with precipitation 23% above average. Contrary to the results of climate change projections specific to this area, a clear downward trend in precipitation is not detected.

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Section: Case Study: Climate and Contextmentioning

confidence: 99%

Precipitation Variability and Drought Assessment Using the SPI: Application to Long-Term Series in the Strait of Gibraltar Area

Vélez-Nicolás

García-López

Ruiz-Ortiz

et al. 2022

Water

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“…Field studies have been conducted in reservoirs, and a methodology for analyzing the formation of a depression curve has been developed, considering changes in the water level in the reservoir [5,6]. The operation of reservoir cascades is analyzed based on the known theory of control, considering the specific conditions of the economy and social and economic aspects of the region [7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Determination of the time of lowering depression surface in transition zones with a smooth and instantaneous decrease in water level in reservoir

2023

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The Republic of Uzbekistan pays great attention to the development and implementation of a program for the development of hydropower based on ensuring the share of hydropower in the energy potential and the integrated development of hydropower potential. Over the last three years, hydropower plants have been built or reconstructed in more than a dozen small and medium-sized earth dams to accomplish this task. Typically, unstable filtration is observed in the body of earth dams because of deviations from the normal filling and emptying of water reservoirs. The main goal of the research is to determine the time to lower the depression surface in the Tupalang earth dam transition zones, which characterizes the intensity of unstable filtration during a smooth and sudden drop in reservoir water level. The calculations were made according to the theoretical dependences of V.P.Nedriga for two cases of smooth and sudden lowering of the water level in the reservoir, starting from the normal backed level (NBL). In the calculations, the values of the main parameters were taken to be the coefficient of water loss of the soil (0.3), the coefficient of filtration of the transition zones (9.5 m/day), and the coefficient of laying the slope of the transition zones (0.2). Calculations showed that the time of lowering the depression surface in the transition zones with a gradual decrease in the water level in the reservoir was 84.1 days, and with an instantaneous decrease in the water level during the operation of a dam with a height of 120 m 3.86 days, and during the operation of a dam with a height of 185 m 6.82 days.

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“…The Cadiz coast has high ecological and economic value; hence, numerous studies have been carried out on it. In the field of beach regeneration, publications [1][2][3] stand out.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Topographic Surveys with RPAS in Steep Coastal Dunes

Contreras-de-Villar,

García,

Muñoz-Perez

et al. 2023

Land

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The current use of photogrammetric systems with RPAS (remotely piloted aircraft systems) for the acquisition of topographic data in every type of coastal area has the benefit of a low risk for the personnel involved, good precision, increased productivity, and lower costs. However, their accuracy has not yet been researched in areas with steep terrain. In this paper, we study dune areas with slopes between 20 and 30%. The objective of this work is to examine the influence of the inclination of both the flight and the camera and to compare the results with those obtained using constant-height flights. With the data collected during three field campaigns, a total of 18 cases were studied. Among the results obtained, in the case of the horizontal flights, a vertical error of 0.048 m was detected for a 0° inclination of the camera versus an error of 0.086 m for a 10° inclination, thus an increase in the camera inclination decreased the accuracy by 44%. Moreover, the flight inclination did not lead to a significant reduction in the error. Therefore, as a main conclusion, the planning of horizontal flights as well as the non-tilt of the camera are recommended.

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Learning from hydrological and hydrogeological problems in civil engineering. Study of reservoirs in Andalusia, Spain

Cited by 9 publications

References 66 publications

Precipitation Variability and Drought Assessment Using the SPI: Application to Long-Term Series in the Strait of Gibraltar Area

Precipitation Variability and Drought Assessment Using the SPI: Application to Long-Term Series in the Strait of Gibraltar Area

Determination of the time of lowering depression surface in transition zones with a smooth and instantaneous decrease in water level in reservoir

Analysis of Topographic Surveys with RPAS in Steep Coastal Dunes

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