Examinando por Autor "Carvajal, Yesid"

Mostrando 1 - 4 de 4
  • Miniatura
    PublicaciónAcceso abierto
    Determination of simple and complex water level – discharge relationship in a river. Case of the Cauca River
    (Universidad del Valle, 2018-07-19) Ramírez, Carlos A.; Carvajal, Yesid; Bocanegra, Ricardo A.; Sandoval, María C.
    (Eng) The stage – discharge relationship in a river, or rating curve, is very useful because it allows calculating the discharg - es from measured stages or water levels in a gauge station. For a nearly steady regime a discharge corresponds to a water level (simple relationship). However, frequently different circumstances can originate a complex relation between waters levels and discharges and then a discharge can be referred to two water levels and vice versa. In this study, simple and complex rating curves were determined in La Balsa hydrometric station, located 27 km downstream of Salvajina reservoir (Cauca river, Colombia). The simple curve was calculated by applying the log - arithmic method, which allows identifying the characteristics of the type of control that determines the water level – discharge relationship. The complex curve was calculated by using the method of storage per unit rate of variation in water levels, which allows adjusting the discharge obtained with the rating curve for steady flow considering a storage due to the variation in the level. The results show significant differences in the estimated discharges through the two relationships. By applying the two rating curves for a moderate flood (01/01/1999) differences up to 19% were estimated between both calculated discharges. In consequence, in order to get the appropriated rating curve it should to carry out a rigorous analysis of the flow conditions on the river reaches of the hydrometric station.
  • Miniatura
    PublicaciónAcceso abierto
    Hydrological analysis of historical floods in the upper valley of Cauca river
    (Universidad del Valle, 2016-01-19) Carvajal, Yesid; Enciso, Angélica; Sandoval, Maria Clemencia
    (Eng) The Cauca River is the main surface water source in Valle del Cauca. In the past 25 years, it has registered important flows causing floods as the ones that occurred between 2010 and 2011, whose effects passed in economic losses for the region. The aim of this paper is to carry out a hydrological analysis of historical floods of the Cauca River. The methodology was structured in three stages to identify the most influential hydro-meteorological factors: i) General description of the basin to identify the main characteristics; (ii) Analysis of the frequency of maximum events, applying probability distribution functions to series of precipitation and maximum daily flows; and iii) The hydrological characterization of floods that occurred after the Salvajina dam was constructed (1988-2011). As a result, it was identified that the most influential factor causing floods is the precipitations associated with the cool phase of El Niño-Southern Oscillation (ENSO), La Niña; it significantly affects the river's flow volume, and its tributaries.
  • Miniatura
    PublicaciónAcceso abierto
    Incidencias de las actividades productivas en el flujo de servicios ecosistémicos híbridos ofrecidos por los páramos colombianos : caso Puracé.
    (2018-04-20) Pérez Rincón, Mario Alejandro; Rojas Padilla, Johnny; Vaquero, Olga Lucía; Peña Varón, Miguel; Carvajal, Yesid
    El enfoque de servicios ecosistémicos (SE) es en la actualidad el principal marco teórico para analizar las relaciones sociedad-naturaleza, a la vez que se le usa como instrumento para la gestión de la biodiversidad y los ecosistemas, guía para la formulación de políticas, e incluso un discurso potente en pro de la conservación o el uso de la naturaleza.
  • Miniatura
    PublicaciónAcceso abierto
    Storm Water Management Model Simulation and Evaluation of the Eastern urban drainage system of Cali in the face of climate variability scenarios
    (Universidad del Valle, 2019-07-31) Carvajal, Yesid; Ocampo, Camilo; Peña, Luis E.
    (Eng) Occurrence of extreme hydroclimatological events associated with climatic variability and climate change, along with deficient development of urban drainage systems, have increased the occurrence of floods in cities. This study analyzes the hydraulic behavior of the urban drainage system in the e ast of Cali, during the occurrence of maximum rainfall events, supported by the Storm Water Management Model. Three simulation climate scenarios were developed: (i) current scenario with a return time of 2 and 10 years, (ii). a climate scenario for the yea r 2030 and (iii) a climate scenario for the year 2040. The model presented an acceptable grade of calibration, with a Nash - Sutcliffe number greater than 0.5 in simulated events, therefore the results obtained appropriately describe the behavior of surface runoff in the study area, in terms of spatial and temporal resolution. In this way, critical points of the drainage system were identified. This information may be potentially useful in the planning of future hydraulic works, leading to an improvement of t he hydraulic behavior of the system, and the protection of life and property of the inhabitants of the city.