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| Titel |
Improvement for the multi-scale periodic characteristics revealing of precipitation signals and its impact assessment on soil hydrological process by combining HHT and CWT approaches |
| VerfasserIn |
S. Yu, J. Yang, G. Liu, R. Yao, X. Wang |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1561-8633
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| Digitales Dokument |
URL |
| Erschienen |
In: Natural Hazards and Earth System Sciences ; 15, no. 3 ; Nr. 15, no. 3 (2015-03-04), S.393-407 |
| Datensatznummer |
250119360
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| Publikation (Nr.) |
 copernicus.org/nhess-15-393-2015.pdf |
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| Zusammenfassung |
| This study conducts a detailed analysis
of multi-scale periodic features involved in the annual and seasonal
precipitation signals at the typical coastal reclamation region in China by
selecting the suitable continuous wavelet transform (CWT) and innovatively
combining the improved Hilbert–Huang transform (HHT), and further deduces
the precipitation trend and its impacts on the future soil hydrological
process. The Morlet wavelet transform is proved suitable in revealing the
precipitation signals broad-scale periodicities, however, the critical mode
mixing problem in CWT causes the poor significance in the fine-scale
periodicities, which cannot well match the climate background. By combining
the HHT approach, the fine-scale mode mixing drawback in CWT is effectively
eliminated, and the the studied precipitation signals multi-scale
periodicities are accurately revealed. Consequently, an overall decreasing
trend of annual and seasonal precipitation in future years is
demonstrated. Furthermore, by novelly using the cross wavelet transform
(XWT) and wavelet transform coherence (WTC) approaches, the prominent
correlations between the precipitation dynamics and soil and groundwater
salinities dynamics, it is demonstrated that the precipitation increase can effectively leach
the surface soil salt downwards into the deeper soil layers and groundwater
with 5–7-day lag in the new cultivated tidal land. The
revealed future decreasing trend of precipitation, especially in spring and
summer, may aggravate the soil salinization at the coastal reclamation
region, thus some reasonable salt leaching and evaporation suppression
measures need to be taken to prevent the possible soil secondary
salinization process. |
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