排序方式： 共有17条查询结果，搜索用时 15 毫秒
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Pham Quoc Bao Ali Sk Ajim Bielecka Elzbieta Calka Beata Orych Agata Parvin Farhana Łupikasza Ewa 《Natural Hazards》2022,113(2):1043-1081
Natural Hazards - Advances in the availability of multi-sensor, remote sensing-derived datasets, and machine learning algorithms can now provide an unprecedented possibility to predict flood events... 相似文献
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E. Niemirycz 《洁净——土壤、空气、水》1999,27(5):286-291
The discharge of organic matter, nutrients, and heavy metals from the river Odra into the Baltic Sea is compared with the combined discharge of the same substances from other Polish rivers into the Baltic during 1988–1997. The impact of the summer flood of 1997 is also discussed. The discharges of organic matter, nitrogen and phosphorus compounds were closely correlated with the flow rate. The annual loads of these nutrients measured in 1988 and 1996 under similar flow conditions decreased by 15 to 40% in these rivers as a result of the reduction of point sources. A steady decrease in the heavy metal load, independent of weather conditions, has been recorded during the past decade. Zinc decreased by up to 85% in the Odra and 99% in the Wisła. Although the water outflow from the Odra was half that of the Wisła, it transported a proportionally higher load of chemical compounds. Despite the differences in flow rates, the contribution of both rivers to the total riverine phosphorus discharge was approximately the same. The total water outflow during the flood (from 1 July to 28 August 1997) increased by 65% near the mouth of the Odra in comparison to 1996. The phosphate discharge increased by 34%, that of nitrite nitrogen by 88% 相似文献
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Elzbieta M. Bitner 《Applied Ocean Research》1980,2(2):63-73
This study deals with the non-linear effects of shallow-water wind waves. It is assumed that wind waves are an ergodic, random process, quasi-normal, stationary in time and homogeneous in space. The probability density function of sea surface oscillations is approximated by Gram-Charlier series in a modified form due to Edgeworth. Based on the above assumptions and on the fundamental statistical and stochastical laws the author has obtained the following characteristics: the probability density functions of wave heights, wave phases and velocity of the point mean wave height and mean wave length. The derived formulae are compared by the experimental data of the international expedition ‘Lubiatowo-74’. The analysis carried out has shown that real waves and the Gaussian model contradict considerably. 相似文献
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This paper presents results of a study on the concentration of adsorbable organic halogens (AOX) in water samples of the Oder River and its tributaries collected from 1998 to 2002. The Vistula River water for AOX was analysed in the period 2001–2002. The investigated waters of the Vistula near the mouth (Kiezmark) were more contaminated with AOX than the Oder near the mouth (Widuchowa, Krajnik Dolny). In general, AOX levels in the Polish rivers are comparable to the values found in the European rivers, e.g. the Rhine and the Ton. The research has shown that AOX were correlated with pH, total suspended solids, and the riverine flow. No relation between dissolved oxygen and redox potential and AOX was found out. During the flood period AOX, inorganic halogens (TIX), and mineral substances (sulfates) were analysed. 相似文献
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B. Bierawska D. G&#x;d J. B&#x;aejowski B. Lammek J. Szafranek E. Niemirycz 《洁净——土壤、空气、水》1999,27(5):350-356
Fourteen polycyclic aromatic hydrocarbons (PAH), six monosaccharides (SA) formed following the hydrolysis of polysaccharides, as well as water and organic matter contents were determined in river sediments sampled in thirteen points in the Odra basin after the catastrophic flood of 1997. The water content is related to the water absorbing capacity of the soil in the Odra catchment area. The PAH content increases together with the increase in the organic matter (OM) content which suggests that these species are mainly of anthropogenic origin. On the other hand, SA and OM contents decrease with increasing water content, which implies that both enhance biological life. The PAH content tends to decrease when the SA content increases. This relation goes hand in hand with the quality of water resources, which is greater when the quantity of polysaccharides is higher. 相似文献
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It is demonstrated that for linear deep sea waves with small directional scattering the particle motion at the sea surface and energy transmission may be retrieved from a wave record by means of the Hilbert transform. A physical interpretation of the envelope of the two-dimensional deep sea waves as well as a new method for wave group analysis is presented. 相似文献
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