caa a22 4500 44581540X CHVBK 20180317145226.0 cr unu---uuuuu 170323e20110801xx s 000 0 eng 10.1007/s10040-011-0737-y doi (NATIONALLICENCE)springer-10.1007/s10040-011-0737-y Fiorillo Francesco Dipartimento di Studi Geologici ed Ambientali, University of Sannio, via dei Mulini 59/9, 82100, Benevento, Italy aut Tank-reservoir drainage as a simulation of the recession limb of karst spring hydrographs [Elektronische Daten] [Francesco Fiorillo] Vidange d'une citerne pour simuler la courbe de tarissement des hydrogrammes de sources karstiques Drenaje del reservorio tanque como una simulación de la curva de recesión dl hidrogramas de un manantial kárstico 箱式水仓模拟岩溶泉侧翼排泄过程 Simulazione del tratto di recessione degli idrogrammi di sorgenti carsiche mediante il drenaggio di un serbatoio-cisterna Drenagem de um reservatório/tanque para simulação da curva de recessão em zonas cársicas usando hidrogramas de nascentes Drainage of a cylindrical water-filled tank-reservoir has been analysed by different physical models, providing relative discharge-time equations. The process has been simulated (1) in a condition of free-flow discharge, where no energy is lost during the process, and (2) where friction forces and water viscosity take effect. Simulation (1) is considered to be a Torricelli reservoir, characterised by a linear decrease of discharge; (2) is based on Darcy's law or on Poiseuille's law, where discharge decreases exponentially with time, giving a straight line in the semilogarithm plot. For the Darcy's law simulation, the tank tube was filled with sand. The cylindrical water-filled tank-reservoir drainage analysis has been applied to simulation of the actual shape of karst spring hydrographs. It has been determined that the recession coefficient, α, is proportional to a hydraulic constant, c, which represents the hydraulic characteristics during the baseflow recession, and α is inversely proportional to the product of the water-table area with the effective porosity. This product expresses the area of the aquifer filled by free-flowing water along the water table and can vary during the aquifer drainage. Springer-Verlag, 2011 Spring hydrograph nationallicence Karst aquifer nationallicence Drainage nationallicence Recession coefficient nationallicence Hydrogeology Journal Springer-Verlag 19/5(2011-08-01), 1009-1019 1431-2174 19:5<1009 2011 19 10040 https://doi.org/10.1007/s10040-011-0737-y text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10040-011-0737-y text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Fiorillo Francesco Dipartimento di Studi Geologici ed Ambientali, University of Sannio, via dei Mulini 59/9, 82100, Benevento, Italy aut NATIONALLICENCE 773 0- Hydrogeology Journal Springer-Verlag 19/5(2011-08-01), 1009-1019 1431-2174 19:5<1009 2011 19 10040 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer