ON SOME NEOLITHIC (AND POSSIBLY PALAEOLITHIC) FINDS IN MONGOLIA,SINKIANG AND WEST CHINA     

德日進  楊鍾健 《地质学报》1933,(1)

In the course of the past two years,when they were in the field with theThird American (1930) and the Haardt-Citroen (1931) Central Asiatic Expedi-tions,the authors of the present note had opportunities for making a series ofarchaeological observations ov  相似文献   

ON AN ENIGMATIC PTEROPOD-LIKE FOSSIL FROM THE LOWER CAMBRIAN OF SOUTHERN SHANSI,BICONULITES GRABAUI,NOV.GEN.,NOV.SP.     

P.TEILHARD DE CHARDIN 《地质学报》1931,(1)

Ⅰ. GEOLOGY OF THE SITE The Lower Cambrian fossils here described were first found, insufficiently preserved, by Licent and Teilhard in 1926 at K(?)ntingshih (圪丁石), just along the border of the high limestone range, 50 lis N. of Cbishanhsien (S. Shansi).  相似文献   

ON THE RECENT MARINE BEDS,AND THE UNDERLYING FRESHWATER DEPOSITS,IN TIENTSIN By E.LICENT AND P.TEILHARD DE CHARDIN     

E.LICENT  P.TEILHAND DE CHAREIN 《地质学报》1927,6(2):131-132

Marine beds, containing numerous well preserved shells, are actuallyexposed in a broad pit recently open, one mile south from the Hoangho-PaihoMuseum (Race Course Road, Tientsin), in order to get the earth required forthe filling of some pools along the Race Course Road.  相似文献   

ON A PRESUMABLY PLEISTOCENE HUMAN TOOTH FROM THE SJARA-OSSO-GOL (SOUTHEASTERN ORDOS) DEPOSITS     

E.LICENT  TEILHARD DE CHARDIN  DAVIDSON BLACK 《地质学报》1926,(Z1)

  相似文献   

THEME 5 SEDIMENT PROBLEMS RELATED TO INTAKE STRUCTURES AND THE INFLUENCE OF INTAKES ON THE SEDIMENT REGIME OF RIVERS     

M. DE VRIES 《水文科学杂志》2013,58(4):543-544

ABSTRACT

The paper presents the observed effects on the streamflow of changing a tropical forest in the high rainfall belt of Zambia to agricultural use based on traditional farming methods. Hydrological observations were carried out on four small catchments under their natural conditions first, and later two of them under agricultural use with accompanying deforestation. Simple linear regression analysis of both monthly and annual runoff from the treated catchments on the monthly and annual runoff from undisturbed catchments showed that there was an increase in streamflow as a result of deforestation and subsistence agriculture. It is also shown that the shape of the flood hydrograph was changed as a result of changes in land use.  相似文献   

Interpretation of the behaviour of agrowell systems in Sri Lanka using radial flow models     

C. S. DE SILVA  K. R. RUSHTON 《水文科学杂志》2013,58(6):825-835

Abstract

This paper describes a study of the use of large diameter “agrowells” used for irrigation in Sri Lanka. Detailed field information for a single location is presented and a numerical radial flow model was used to interpret the field response. Initially the model was used to represent a pumping test in which the pumping and subsequent recovery were monitored. It was then used to investigate the operation of the well during a dry season. Satisfactory agreement could only be obtained when account was taken of the withdrawal of water from below the water table by trees. From the simulation it was possible to show that skilful farming practice could be used in steadily exploiting the resources for irrigation over the whole of the dry season.  相似文献   

Modelling solute leaching during fingered flow by integrating and expanding various theoretical and empirical concepts     

GERRIT H. DE ROOIJ  HIROYUKI CHO 《水文科学杂志》2013,58(3):447-465

Abstract

Wetting front instability (fingered flow) accelerates solute transport through the unsaturated zone to the groundwater table. Whether fingers widen or dissipate close to the groundwater is unclear. Water flow in a two-dimensional artificial capillary fringe below a dry layer exhibiting fingered flow was investigated. The flow diverged strongly in the wet soil, suggesting that fingers dissipate. Expressions for the finger radius in dry and wet soil were combined and adapted to a soil hydraulic property parameterization popular in numerical modelling. The modified equation provided finger radii for soils in humid and arid climates. The fingers in the arid soil were excessively wide. The finger radii were used to model solute transport, assuming fingers dissipated in the subsoil. Modelling was cumbersome for the arid climate. One shower may often be insufficient to trigger fingering in arid regions with short, heavy showers. In soils with shallow groundwater, the diverging subsoil flow determines solute leaching.  相似文献   

Younger Dryas – early Holocene transition in the south‐eastern Iberian Peninsula: insights from land snail shell middens     

YURENA YANES  MAGDALENA GÓMEZ‐PUCHE  MARCO A. ESQUEMBRE‐BEBIA  JAVIER FERNÁNDEZ‐LÓPEZ‐DE‐PABLO 《第四纪科学杂志》2013,28(8):777-788

  相似文献   

Evaporation of grass under non-restricted soil moisture conditions     

H. A. R. DE BRUIN  J. N. M. STRICKER 《水文科学杂志》2013,58(3):391-406

Abstract

The behaviour of various formulas for evapotranspiration of grass in Nonrestricted soil water conditions is considered. These are the expressions based on the Penman formula, i.e. “old” Penman, Penman-Monteith, Thorn-Oliver and the version recommended more recently by the FAO. Moreover, the Priestley-Taylor and the Makkink formulas are considered, which are radiation-based. Comparisons are made between daily mean values estimated with these formulas and direct measurements. The latter were collected over grass in the period 1979–1982 in the catchment area of the Hupselse Beek (The Netherlands). It was found that if all required input data were measured, the Priestley-Taylor and the “old” Penman formula yielded the best results. The assumption that soil heat flux can be neglected introduces a systematic and a random error of roughly 5%. The empirical estimates for net radiation from sunshine duration, temperature and humidity appear to perform rather poorly. These estimates improved significantly if solar radiation was measured directly. The empirical expression proposed by Slob (unpublished) that requires incoming solar radiation only as input, provided better results than the other more complicated expressions. Moreover, this study reveals that evaporation of unstressed grass is primarily determined by the available energy, i.e. good evaporation estimates can be obtained by using simply λE = 0.86(R_n ? G). The Makkink method appears to be attractive for practical applications. These findings support the use of Makkink's formula for routine calculations of crop-reference evapotranspiration as has been done by the Royal Netherlands Meteorological Institute since 1987.  相似文献   

DAMOCLES: a DAshing MOnolith Cutter for fine sectioning of peats and sediments into LargE Slices     

HANS JOOSTEN  PIM DE KLERK 《Boreas: An International Journal of Quaternary Research》2007,36(1):76-81

Simple cutting devices such as used in the printing industry allow precise and fine sectioning of frozen peats and sediments, thus enabling research with high temporal resolution. Large slices are useful in the collection of multiple synchronous subsamples for multidisciplinary research. This article describes the apparatus (called DAMOCLES) and its operation, and presents some examples from practice. These include combined microfossil, macrofossil and chemical analyses of the same sample with a sample resolution of 0.5 cm (temporal resolution c. 1 year): rapid changes occur that would have remained unnoticed with a coarser sampling distance. The final example presents a sample resolution of only 0.5 mm. These examples illustrate the possible uses of the DAMOCLES apparatus in palaeoecological research.  相似文献