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- 저자 : Dennis Timlin (검색결과 3 건)
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Flexibility on storage-release based distributed hydrologic modeling with object-oriented approach
Kang, Kwangmin,Merwade, Venkatesh,Chun, Jong Ahn,Timlin, Dennis Elsevier 2016 Journal of hydrology Vol.540 No.-
<P><B>Summary</B></P> <P>With the availability of advanced hydrologic data in public domain such as remote sensed and climate change scenario data, there is a need for a modeling framework that is capable of using these data to simulate and extend hydrologic processes with multidisciplinary approaches for sustainable water resources management. To address this need, a storage-release based distributed hydrologic model (STORE DHM) is developed based on an object-oriented approach. The model is tested for demonstrating model flexibility and extensibility to know how to well integrate object-oriented approach to further hydrologic research issues, e.g., reconstructing missing precipitation in this study, without changing its main frame. Moreover, the STORE DHM is applied to simulate hydrological processes with multiple classes in the Nanticoke watershed. This study also describes a conceptual and structural framework of object-oriented inheritance and aggregation characteristics under the STORE DHM. In addition, NearestMP (missing value estimation based on nearest neighborhood regression) and KernelMP (missing value estimation based on Kernel Function) are proposed for evaluating STORE DHM flexibility. And then, STORE DHM runoff hydrographs compared with NearestMP and KernelMP runoff hydrographs. Overall results from these comparisons show promising hydrograph outputs generated by the proposed two classes. Consequently, this study suggests that STORE DHM with an object-oriented approach will be a comprehensive water resources modeling tools by adding additional classes for toward developing through its flexibility and extensibility.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The STORE DHM is developed by object-oriented approach in GIS. </LI> <LI> The STORE DHM is applied to simulate hydrological processes with multiple classes. </LI> <LI> The STORE DHM can be updated without changing main frame. </LI> <LI> The NearestMP and KernelMP are proposed for evaluating STORE DHM flexibility. </LI> </UL> </P>
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Runoff Losses of Suspended Sediment, Nitrogen, and Phosphorus from a Small Watershed in Korea
Chun, Jong A.,Cooke, Richard A.,Kang, Moon S.,Choi, Minha,Timlin, Dennis,Park, Seung W. Wiley (John WileySons) 2010 Journal of environmental quality Vol.39 No.3
<P>Nutrients and sediments in runoff lead to the degradation of water quality of lakes and streams. The development of schemes to mitigate such degradation requires a characterization of the underlying transport processes. The objectives of this study were to develop annual and seasonal load-discharge relationships for suspended sediment (SS), total nitrogen (TN), and total phosphorus (TP) losses from a small mixed land use watershed and to use these relationships to explicate the annual and monthly patterns of losses of these species. Data from 1996 to 2004 were used to develop load-discharge relationships for SS, TN, and TP at the HP#6 watershed, a subwatershed of the Balhan reservoir watershed located in Bongdam-myun and Paltan-myun, Gyeonggi-do, Korea. Standard least squares curve fitting and S-estimation procedures were used to fit power functions to the data collected over this time period. The fitted load-discharge relationships are indicative of seasonal variations in SS and TN and of TP losses from HP#6. The exponents of the fitted power functions for TN and TP in the fall, for TP in summer season, and for SS in all seasons are >1, indicating that the concentrations of these species increase as flow rate increases. Most of the SS, TN, and TP transported in runoff left the watershed between April and September; thus, cost-efficient strategies can be established by focusing on this period. Further study of the seasonal variations is required for a better characterization of seasonal losses of SS, TN, and TP in runoff from the HP#6 watershed.</P>
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