Complement and Restoration of Hydraulic Data Related to Seawater Intrusion into Lake Ogawara.

概要

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Because the salinity condition of a brackish lake is fluctuated by rather stochastic events of the seawater intrusion, topographic changes in the estuarial region, meteorological conditions, etc., a time series analysis of long-term hydraulic data is needed to estimate the range of the variations of lake water salinity. The purpose of this study is to restore long-term hydraulic data related to the seawater intrusion into Lake Ogawara in Aomori Prefecture, where some of important hydraulic factors have not been measured till quite recently or their measurements have been frequently interrupted by instrument troubles. The relationships among the hydraulic quantities, such as flow rate, water stages and tidal level, are evaluated and formulated based on physical interpretation, using a complete data set of the last two years. Some different ways to estimate missing data are constructed in order to deal with various combinations of available data, and the accuracy of estimation is examined for each method by reproducing the existing data. The data for the past 17 years were finally complemented. A comparison of the results by different ways gives the reliability of estimation.
水文・水資源学会の論文