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Dynamic hydrologic modeling using the zero‐parameter Budyko model with instantaneous dryness index
Author(s) -
Biswal Basudev
Publication year - 2016
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1002/2016gl070173
Subject(s) - dryness , index (typography) , hydrological modelling , function (biology) , drainage basin , environmental science , series (stratigraphy) , hydrology (agriculture) , computer science , climatology , geology , medicine , paleontology , surgery , cartography , geotechnical engineering , evolutionary biology , world wide web , geography , biology
Long‐term partitioning of hydrologic quantities is achieved by using the zero‐parameter Budyko model which defines a dryness index. However, this approach is not suitable for dynamic partitioning particularly at diminishing timescales, and therefore, a universally applicable zero‐parameter model remains elusive. Here an instantaneous dryness index is proposed which enables dynamic hydrologic modeling using the Budyko model. By introducing a “decay function” that characterizes the effects of antecedent rainfall and solar energy on the dryness state of a basin at a time, I propose the concept of instantaneous dryness index and use the Budyko function to perform continuous hydrologic partitioning. Using the same decay function, I then obtain discharge time series from the effective rainfall time series. The model is evaluated by considering data form 63 U.S. Geological Survey basins. Results indicate the possibility of using the proposed framework as an alternative platform for prediction in ungagued basins.