Exploring parsimonious daily rainfall-runoff 바카라 유튜브 structure using the hyperbolic tangent function and Tank 바카라 유튜브
2020-06-30l Hit 2327
The Rural Water Resources Systems Engineering laboratory, which is run by Professor Moon-Seong Kang in the Department of Landscape Architecture and Rural Systems Engineering at the College of Agriculture and Life Sciences, found that the response of a watershed to rainfall could be expressed as a hyperbolic tangent function of rainfall depth and the available storage of a linear tank 바카라 유튜브. Such finding enabled developing a simple 바카라 유튜브ing strategy capable of accurately predicting daily runoff from rainfall only with four parameters. The parsimonious structure advanced the state-of-art of hydrological 바카라 유튜브ing. The new 바카라 유튜브 also carries direct and vital implications for practical applications such as hydrologic designs and planning for flood control and drainage infrastructure.
Predicting the response (runoff) of watersheds to rainfall is one of the most critical interests in hydrology and water resources engineering, and it is a necessary process to solve water resource problems such as floods or droughts. Hydrologists and water resources engineers use mathematical 바카라 유튜브s to conceptually represent hydrological processes happening in a real-world system such as a watershed. Various methods and tools have been proposed to describe hydrological cycle and processes, and they employ parameters to relate inputs (e.g., rainfall) to outputs (e.g., runoff) with given 바카라 유튜브 structure and assumptions. The large number of parameters helps to improve accuracy statistics in 바카라 유튜브 calibration but deteriorate the predictive power of a 바카라 유튜브. Thus, the parsimonious 바카라 유튜브 structure is desired for reliable hydrological prediction by reducing uncertainty and equifinality. Professor Kang and a Ph.D. student, Jung-Hun Song explored how to achieve the required prediction accuracy with the minimum number of parameters.
The research team designed a numerical experiment with different 바카라 유튜브 structures by combining a Two-Parameter Hyperbolic 바카라 유튜브 (TPHM) with of a general 3-tank 바카라 유튜브 (Figure 1). The numerical experiment systematically evaluated the accuracy and complexity of the combinations of parts of the two 바카라 유튜브s in 41 watersheds distributed across South Korea (Figure 2). The results showed that one of the 바카라 유튜브 structure combinations, called M2 and denoted as Five-Parameter Hyperbolic 바카라 유튜브 (FPHM) later, provided accuracy statistics equal to or better than those of other 바카라 유튜브s that employ more parameters. In the FPHM structure, the TPHM developed to predict quick surface runoff mounted on the bottom layer of the 3-tank 바카라 유튜브 known suitable to describe slow response of a watershed.
Figure 1. The previous 바카라 유튜브 (a, b) predicting the rainfall-runoff process, and the 바카라 유튜브 (c, d) developed through this study.
Figure 2. Spatial variations in the hydrologic characteristics of 41 study watersheds
This study demonstrated daily runoff can be accurately predicted only with four parameters by integrating the strengths of existing 바카라 유튜브s. Such finding has significant implications on hydrological 바카라 유튜브 application to solving water resources management issues as well as the theoretical and experimental hydrology. Especially, this study will give theoretical basis and practical assistance for the management of agricultural water resources by providing accurate but simple hydrological prediction 바카라 유튜브. Based on the results of this study, follow-up studies have tried to establish strategies and frameworks for hydrological prediction in ungauged watershed and to develop a water-environment integrated 바카라 유튜브ing platform for a comprehensive analysis and management of water resources.
《Professor Moon-Seong Kang》