Wavelet analysis of the dynamic characteristics of saltwater intrusion – A case study in the Pearl River Estuary of China

Liu, Bingjun; Shulan, Yan; Chen, Xiaohong; Lian, Yanqing; Xin, Yanbo

doi:10.1016/j.ocecoaman.2014.03.027

Cited by 25 publications

(16 citation statements)

References 30 publications

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“…Wavelet analysis has been applied to the marine science, meteorological and hydrological fields so as to analyse non-stationary time series water quality data as well as meteorological data (Liu et al 2014;Parmar and Bhardwaj 2013;Ng and Chan 2012;Zhang et al 2009;Somoza et al 2013;Ideião and Santos 2005;Sovi et al 2012;Briciu 2014;Torrence and Compo 1998). Wavelet analysis has already been used to study salinity intrusion and river water quality parameters (Liu et al 2014;Parmar and Bhardwaj 2013).…”

Section: Introductionmentioning

confidence: 99%

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Analysis of the dynamic characteristics of seawater intrusion using partial wavelet coherence: a case study at Nakaura Watergate, Japan

Muchebve

Nakamura

Suzuki

et al. 2016

Stoch Environ Res Risk Assess

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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.

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Section: Introductionmentioning

confidence: 99%

“…Wavelet analysis has already been used to study salinity intrusion and river water quality parameters (Liu et al 2014;Parmar and Bhardwaj 2013). However, most authors who applied wavelet analysis to study geophysical processes rely on univariate and bivariate wavelet analysis.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the dynamic characteristics of seawater intrusion using partial wavelet coherence: a case study at Nakaura Watergate, Japan

Muchebve

Nakamura

Suzuki

et al. 2016

Stoch Environ Res Risk Assess

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“…The cross-wavelet transform (XWT), a multiscale signal analytical technique, combines the wavelet transform and cross-spectrum analysis. XWT analyzes multiple time-frequencies of two time series from multiple time scale points, thereby exposing regions with a common high power, and further reveals information about the phase relationship in time-frequency space, hence determining correlations [15,18].…”

Section: Cross-wavelet Transform (Xwt)mentioning

confidence: 99%

“…Ideião et al studied the variability of the total monthly rainfall with the aid of CWT [4,14]. The cross-wavelet transform (XWT) and wavelet coherence (WTC) techniques were used to analyze geophysical time series, for example, the effects of tidal range and river discharge on the salinity intrusion [15,16], the impacts of Arctic Oscillation index and ENSO on the Baltic sea ice [17,18], the relative humidity, and the shortwave radiation dataset [19]. Partial wavelet coherence (PWC) and multiple wavelet coherence (MWC) were used to study the impact of ENSO on the variability of tropical cyclones [20].…”

Section: Introductionmentioning

confidence: 99%

“…It also quantified the relationships between river discharge, tide and meteorological forcing variables, and salinity intrusion, using WTC, XWT, and PWC. Several studies examined the effects of river discharge, tidal range, and meteorological forcing on salinity intrusion [15,16]. Meteorologically induced sea surface variation (MISSV) and large periodic river discharge are considered to be effective water exchange mechanism between Lakes Nakaumi and Shinji, and the Japan Sea [22].…”

Section: Introductionmentioning

confidence: 99%

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Use of Wavelet Techniques in the Study of Seawater Flux Dynamics in Coastal Lakes

Muchebve¹,

Nakamura²,

Kamiya³

2018

Wavelet Theory and Its Applications

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Lakes Shinji and Nakaumi form a coupled brackish lake system on the Japan Sea coast of Japan, and seawater frequently intrudes into these lakes. The study analyzed the influence of river discharge, tide level, and meteorological forcing on seawater flux at Nakaura Watergate. Continuous wavelet transform (CWT), wavelet coherence (WTC), crosswavelet transform (XWT), and partial wavelet coherence (PWC) were used to analyze seawater intrusion. CWT reveals the characteristics of seawater flux, river discharge, tide level, and meteorological forcing. WTC and XWT showed the correlation between forcing variables and seawater flux. PWC analyzed the impact of river discharge, tide level, and meteorological forcing variables on seawater flux after controlling the effect of all other forcing variables. The results showed that tide level has an impact on seawater flux over 0.5-day and 1-day cycle throughout the analysis period, suggesting that astronomical tides play an important role in the salinity intrusion processes. The river discharge characteristics and its influence on seawater flux were clearly revealed especially during high river flows. Sometimes, atmospheric pressure and wind velocity affect tide level, thereby driving salinity transport. The study reveals the power of wavelet analysis in examining nonlinear time series such as salinity intrusion processes.

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Assessment of changes in severity of compound drought and saltwater intrusion events based on a multi‐index approach in Pearl River estuary

Li,

Liu,

et al. 2023

Hydrological Processes

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Global warming alters the inherent variability of climate variables and induces more frequent extremes of hydroclimatic compound events with substantial impacts. The concurrence of hydrological drought and saltwater intrusion in the estuary can have devastating effects on agricultural production, water security, and ecological health. In this study, the compound drought and saltwater intrusion extreme indices, including the Blend Drought and Saltwater intrusion Index (BDSI), the Compound drought and Saltwater intrusion Index (CDSI) and the Standardized Drought and Saltwater intrusion Index (SDSI), were constructed to monitor compound extremes in the critical zone of Pearl River Estuary during the dry season from 1999 to 2016. The results reveal that the three compound indices can effectively depict different aspects of compound drought and saltwater intrusion extreme events in the critical zone of Pearl River Estuary. Among the three indices, the SDSI performed best in depicting compound drought‐saltwater intrusion events, while the BDSI outperformed the other indices in depicting high value of Standardized Runoff Index (SRI) and Standardized Saltwater intrusion Index (SSI), and the CDSI outperformed the other indices in depicting low values of SRI and SSI. Using those developed compound indices, we found that the frequency of abnormal and moderate compound drought‐saltwater intrusion events increased from 9.26% to 12.03% during the period of 1999–2016, while severe, extreme and exceptional compound drought‐saltwater intrusion events were rare.

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Wavelet analysis of the dynamic characteristics of saltwater intrusion – A case study in the Pearl River Estuary of China

Cited by 25 publications

References 30 publications

Analysis of the dynamic characteristics of seawater intrusion using partial wavelet coherence: a case study at Nakaura Watergate, Japan

Analysis of the dynamic characteristics of seawater intrusion using partial wavelet coherence: a case study at Nakaura Watergate, Japan

Use of Wavelet Techniques in the Study of Seawater Flux Dynamics in Coastal Lakes

Assessment of changes in severity of compound drought and saltwater intrusion events based on a multi‐index approach in Pearl River estuary

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