GEOLOGY OF NORTHERN CHIHLI AND EASTERN MONGOLIA.     

P.TEILHARD DE CHARDIN 《地质学报》1924,(Z1)

During the last spring (April-May 1924), we have, F. Licent and I crossed the Northern Chihli and the eastern part of the Inner Mongolia.  相似文献   

THE BASE OF THE PALAEOZOIC IN SHANSI.METAMORPHISM AND CYCLES.     

P. TEILHARD DE CHARDIN 《地质学报》1934,(1)

I had recently an opportunity for observing, along the western border of the northern Hoshan (Central Shansi), at the base of the Palaeozoic, a particularly clear section, in which several interesting features seem to be worth mentioning. This section, illustrated in the text-figure 1, was taken at the entrance  相似文献   

CREATIVITY AND GEOGRAPHY: TOWARD A POLITICIZED INTERVENTION*     

SALLIE A. MARSTON  SARAH DE LEEUW 《Geographical review》2013,103(2):iii-xxvi

  相似文献   

Use of artificial flood events to demonstrate the invalidity of simple mixing models / Utilisation de crues artificielles pour prouver l'invalidité des modèles de mélange simple     

ANDREAS KREIN  RENAAT DE SUTTER 《水文科学杂志》2013,58(4):611-622

Abstract

The whole of a basin responds to a precipitate on event. The resulting flood wave introduces a complex pattern of interrelated processes which occur in the vegetation, soil, bedrock, human facilities, channel and in the different parts of the basin. The main advantage of field experiments is that it becomes possible to exclude several governing factors or sources and to control others by the experimental design. In a small brook near Trier (Germany), artificial flood events are created. In-channel transport processes of sediment are investigated without taking into account the interference of soil erosion and runoff. It is demonstrated that kinematic waves-describing the translation of flow with limited hydraulic dispersion or diffusion-also occur in small basins. The kinematic waves-travelling only a few hundred meters-have a large impact on the relationship between the hydrograph and dissolved or particle-bound substances. Consequently, classifications and simple mixing models between those components are impeded.  相似文献   

L'Amazone à Óbidos (Brésil): étude statistique des débits et bilan hydrologique     

JACQUES CALLEDE  JEAN LOUP GUYOT  JOSYANE RONCHAIL  MICHEL MOLINIER  EURIDES DE OLIVEIRA 《水文科学杂志》2013,58(2):321-333

Résumé

Effectuées dans le cadre du Projet Hidrologia e geoquímica na Bacia Amazönica (HiBAm), les nouvelles mesures de débit à Obidos ont amélioré la connaissance des caractéristiques hydrologiques de l'Amazone à cette station qui contrâle les plus forts débits du monde. Une nouvelle méthode de correction détermine les débits journaliers avec une précision de ±3.0%. La reconstitution des périodes manquantes, avec les observations faites à Manaus, permet de disposer d'une chronologie de près d'un siècle. Avec cet échantillon commençant en 1902, le module interannuel de l'Amazone à Obidos est de 163 000 m³ s^?1, avec un coefficient d'irrégularité extrêmement faible (K3 = 1.28). L'étiage décennal (78 000 m³ s^?1) est de même grandeur que la crue centenaire du Congo à Brazzaville. La crue décennale est estimée à 260 000 m³ s^?1. Le Bilan hydrologique indique un déficit d'écoulement de 1193 mm, qui peut être assimilé à l'évapotranspiration réelle. En conclusion, l'Amazone est bien le fleuve le plus puissant et le plus régulier de la planète.  相似文献   

Yearly variation and annual cycle of total column ozone over New Delhi (29°N, 77°E), India and Halley Bay (76°S, 27°W), British Antarctic Survey Station and its effect on night airglow intensity of OH(8, 3) for the period 1979–2005     

P K JANA  D K SAHA  D SARKAR 《Journal of Earth System Science》2012,121(6):1527-1541

  相似文献   

Wave hindcast experiments in the Indian Ocean using MIKE 21 SW model     

P G REMYA  RAJ KUMAR  SUJIT BASU  ABHIJIT SARKAR 《Journal of Earth System Science》2012,121(2):385-392

  相似文献   

A depositional model for a wave‐dominated open‐coast tidal flat,based on analyses of the Cambrian–Ordovician Lagarto and Palmares formations,north‐eastern Brazil     

GIORGIO BASILICI  PEDRO HENRIQUE VIEIRA DE LUCA  ELSON PAIVA OLIVEIRA 《Sedimentology》2012,59(5):1613-1639

Open‐coast tidal flats are hybrid depositional systems resulting from the interaction of waves and tides. Modern examples have been recognized, but few cases have been described in ancient rock successions. An example of an ancient open‐coast tidal flat, the depositional architecture of the Lagarto and Palmares formations (Cambrian–Ordovician of the Sergipano Belt, north‐eastern Brazil) is presented here. Detailed field analyses of outcrops allowed the development of a conceptual architectural model for a coastal depositional environment that is substantially different from classical wave‐dominated or tide‐dominated coastal models. This architectural model is dominated by storm wave, low orbital velocity wave and tidal current beds, which vary in their characteristics and distribution. In a landward direction, the storm deposits decrease in abundance, dimension (thickness and spacing) and grain size, and vary from accretionary through scour and drape to anisotropic hummocky cross‐stratification beds. Low orbital wave deposits are more common in the medium and upper portion of the tidal flat. Tidal deposits, which are characterized by mudstone interbedded with sandstone strata, are dominant in the landward portion of the tidal flat. Hummocky cross‐stratification beds in the rock record are believed, in general, to represent storm deposits in palaeoenvironments below the fair‐weather wave base. However, in this model of an open‐coast tidal flat, hummocky cross‐stratification beds were found in very shallow waters above the fair‐weather wave base. Indeed, this depositional environment was characterized by: (i) fair‐weather waves and tides that lacked sufficient energy to rework the storm deposits; (ii) an absence of biological communities that could disrupt the storm deposits; and (iii) high aggradation rates linked to an active foreland basin, which contributed definitively to the rapid burial and preservation of these hummocky cross‐stratification deposits.  相似文献   

Evaluation of OSCAR ocean surface current product in the tropical Indian Ocean using in situ data     

RAJESH SIKHAKOLLI  RASHMI SHARMA  SUJIT BASU  B S GOHIL  ABHIJIT SARKAR  K V S R PRASAD 《Journal of Earth System Science》2013,122(1):187-199

  相似文献   

Late Paleocene–early Eocene carbon isotope stratigraphy from a near-terrestrial tropical section and antiquity of Indian mammals     

A SAMANTA  A SARKAR  M K BERA  JYOTSANA RAI  S S RATHORE 《Journal of Earth System Science》2013,122(1):163-171

  相似文献