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49 results for “Copula”
Optimal copula models for the observed discharge and nitrate concentration in the Lower Illinois River
<p>Investigating the complex relationships between water quality parameters and river discharge has been an area of active research for decades. The objective of this study is to apply bivariate distributions to river nitrate concentration and discharge and to suggest the procedure of choosing the best bivariate distribution in the selected models. Nitrate concentration (NO<sub>3</sub>) data were measured from 1972 to 2012 at five stations in the Lower Illinois River basin, USA. The bivariate distribution was represented by applying three copula models to explore the dependence between discharge and nitrate concentration. The marginal distributions for the copula models include the generalized Pareto (GPA), generalized extreme value (GEV), two-parameter lognormal (LN2), and three-parameter lognormal (LN3) distributions as well as the three copula models of Clayton, Frank, and Gumbel, respectively. Each procedure was tested by the robust diagnostic, the probability plot correlation coefficient (PPCC) test, and the goodness-of-fit test ( statistic). Consequently, the Frank copula model with GPA for stream flow–GPA for nitrate concentration performed more accurately for data from the mainstream stations, Havana (D-31) and Valley City (D-32) and for those from a station on one tributary, Oakford station along the Sangamon River (E-25). However, along other tributaries such as the La Moine River at Ripley (DG-01) and Spoon River at Seville (DJ-08), the Clayton copula model with NL3 for stream flow–GPA for nitrate concentration showed better fit. This study enabled us to develop a procedure to determine an optimal copula for application to the environmental sciences and suggest a case study for the application of copula models to discharge, as a hydrologic variable, and nutrient concentration as a water quality variable.</p>
Fig. 19 in Die " Copula " der Oribatiden (Moosmilben)
Fig. 19. Rocher Fond Saint-Martin en voie de recolonisation par la végétation (10 juin 2017) (© AP).
Fig. 17 in Die " Copula " der Oribatiden (Moosmilben)
Fig. 17. Rocher Fond Saint-Martin, repousse de la végétation après le passage des feux (28 juin 2015) (© AP).
Fig. 10 in Die " Copula " der Oribatiden (Moosmilben)
Fig. 10. Espèces caractéristiques des pelouses calcaires de Han-sur-Lesse et leur distribution en Belgique.
Fig. 11 in Die " Copula " der Oribatiden (Moosmilben)
Fig. 11. Champs Spaloux: pelouse calcaire avec Stachys officinalis, habitat de Rophites quinquespinosus (20 juin 2014) (© AP.)
Quantitative assessment of the reservoir-induced and urbanization-induced impact on multivariate flood risk via a nonstationary vine Copula model
<p>Here we show the results of the characteristics of the floods at Huayuankou, Lanzhou and Toudaoguai gauges selected by AMS and POT mentod, respectively. Besides that, the inormation about the reservoirs and the imprevious layer in the control catchment of each station is also uploaded.</p>
Fig. 24 in Die " Copula " der Oribatiden (Moosmilben)
Fig. 24. Rophites quinquespinosus, mâle (© NV).
Fig. 23 in Die " Copula " der Oribatiden (Moosmilben)
Fig. 23. Trachusa byssina sur Hippocrepis (© NV).
Fig. 25 in Die " Copula " der Oribatiden (Moosmilben)
Fig. 25. Osmia bicolor aménageant son nid dans une coquille vide d'escargot (© NV).
Fig. 20 in Die " Copula " der Oribatiden (Moosmilben)
Fig. 20. Réseau des relations plantes - Apoidea sur les pelouses calcaires de Han-sur-Lesse (© NV).
Fig. 18 in Die " Copula " der Oribatiden (Moosmilben)
Fig. 18. Rocher Fond Saint-Martin, après le passage des feux (6 juin 2015) (© AP).
Fig. 14 in Die " Copula " der Oribatiden (Moosmilben)
Fig. 14. Vue aérienne des pelouses calcaires de Han-sur-Lesse (Google, 2017).
Fig. 15 in Die " Copula " der Oribatiden (Moosmilben)
Fig. 15. Le plateau débroussaillé et clôturé fin mai 2015 (© AP).
Fig. 16 in Die " Copula " der Oribatiden (Moosmilben)
Fig. 16. Le rocher Fond Saint-Martin après l'incendie du 18 mai 2015 (© NV).
Fig. 13 in Die " Copula " der Oribatiden (Moosmilben)
Fig. 13. Les différentes variétés de Bombus humilis en Belgique.
Fig. 12 in Die " Copula " der Oribatiden (Moosmilben)
Fig. 12. Distribution de deux espèces de bourdons très menacées en Belgique.
Fig. 22 in Die " Copula " der Oribatiden (Moosmilben)
Fig. 22. Osmia aurulenta sur Hippocrepis (© NV).
Fig. 9 in Die " Copula " der Oribatiden (Moosmilben)
Fig. 9. Distribution des espèces d'Osmiini des pelouses calcaires en Belgique.
Fig. 4 in Die " Copula " der Oribatiden (Moosmilben)
Fig. 4. Floraison des Aster linosyris au Rocher du Fond Saint-Martin (4 septembre 2014) (© AP).
Fig. 7 in Die " Copula " der Oribatiden (Moosmilben)
Fig. 7. La flore des pelouses calcaires de Han-sur-Lesse, dans l'ordre des saisons (suite).
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