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Stochastic Environmental Research and Risk Assessment

, Volume 30, Issue 8, pp 2143–2154

First Online: 31 October 2016

Abstract

Lake Shinji and Lake Nakaumi are coupled brackish lakes on the Japan Sea coast of Japan. Seawater from the Japan Sea frequently intrudes into Lake Nakaumi through the bottom. Salinity flux at Nakaura Watergate was analysed. Effects of river discharge, tide level, and meteorological forcing variables makes the seawater intrusion non-linear. To account for the non-linear characteristics, partial wavelet coherence PWC was used to analyse the impact of river discharge, tide level, and meteorological forcing variables on salinity flux after controlling the effect of all other forcing variables. PWC results show that tide level has impact on salinity flux over short cycles limited to less than 4 days throughout the analysis period with an average time lag of about 2 days. This suggests that astronomical tides are the dominant factor in the salinity intrusion processes. The river discharge largely influences salinity flux over medium cycles 5–16 days during the months of June and July with an average time lag of 0.3 days. Atmospheric pressure occasional affect tide level, indirectly driving salinity transport. The study findings provide guidance for factors affecting salinity intrusion processes and further research.

KeywordsContinuous wavelet transform Partial wavelet coherence Salinity flux  Download fulltext PDF



Author: Edwin Muchebve - Yoshiyuki Nakamura - Takayuki Suzuki - Hiroshi Kamiya

Source: https://link.springer.com/







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