Granulometry and Moisture Influence for In Situ Soil Analysis by Portable EDXRF

Author(s):  
Fábio L. Melquiades ◽  
Rodrigo O. Bastos ◽  
Gabriel E. V. Biasi ◽  
Paulo S. Parreira ◽  
Carlos R. Appoloni ◽  
...  
Author(s):  
Kęstutis Kelevišius ◽  
Gintaras Žaržojus

Dynamic penetration test (DPSH) is one of the large amount of soil in-situ tests are known. In world practice, this method usually used for granular soil investigations although it could be applied in cohesive soils. Correlation of received DPSH test results with soil properties is complex and often not reliable. Especially it becomes obvious after application in cohesive soil analysis. In most cases, correlation depends on soil response to dynamic cone penetration and deformation of dynamic sounding equipment. Measurement of cone accelerations allows precisely evaluate loss of hammer energy, displacement of the cone during strike and other parameters. Correlation of DPSH (measured acceleration of the cone) and CPT test results are presented in this article. In this article also presented studies of possibilities to determine dynamic soil characteristics.


La Granja ◽  
2019 ◽  
Vol 29 (1) ◽  
pp. 56-69
Author(s):  
Paola Jackeline Duque-Sarango ◽  
Ronald Cajamarca-Rivadeneira ◽  
Beverley C. Wemple ◽  
Manuel E. Delgado-Fernández

The present study seeks to estimate the water balance that results as a product of the variation of precipitation and temperature over the Chaquilcay microcatchment, a natural system that intercepts with the surface of the Aguarongo Protected Forest in Gualaceo, Ecuador. Four meteorological stations of the National Institute of Meteorology and Hydrology (INAMHI) were studied, which are divided into climatological and pluviometric, with time series of over 30 years, (1982-2015 period). In order to quantify the contributions and losses of water, statistical analyzes of the time series and surveys of in situ information were carried out. The methods used are linear regression, streak test and double mass curve. To fill and validate the series of precipitation and temperature, reference temperatures of the isothermal raster of Ecuador were included in the pluviometric stations. Additionally, a digital elevation model (MDE) was used to predict the amount of sunshine, and the Thornthwaite evapotranspiration method (1948) was applied from the obtained data. The results show acceptance of the meteorological records, while in the soil analysis we obtained the following data: Humidity, 62.38%; organic matter, 21.29%; field capacity, 18.71 mm and a flow of 1.89 m³ / s during the month of May. Finally, the water balance indicates 843.7 mm of annual precipitation, a storage difference of 18.71 mm representing 2.22% of total precipitation, an surplus of 144.5 mm, and actual evapotranspiration of 680.5 mm, with 17.13% and 80.65%, respectively.


2011 ◽  
Vol 10 (3) ◽  
pp. 141-160 ◽  
Author(s):  
B.H. Foing ◽  
C. Stoker ◽  
J. Zavaleta ◽  
P. Ehrenfreund ◽  
C. Thiel ◽  
...  

AbstractWe describe the field demonstration of astrobiology instruments and research methods conducted in and from the Mars Desert Research Station (MDRS) in Utah during the EuroGeoMars campaign 2009 coordinated by ILEWG, ESA/ESTEC and NASA Ames, with the contribution of academic partners. We discuss the entire experimental approach from determining the geological context using remote sensing, in situ measurements, sorties with sample collection and characterization, analysis in the field laboratory, to the post sample analysis using advanced laboratory facilities.We present the rationale for terrestrial field campaigns to strengthen astrobiology research and the link between in situ and orbital remote sensing data. These campaigns are supporting the preparation for future missions such as Mars Science Laboratory, ExoMars or Mars Sample Return. We describe the EuroGeoMars 2009 campaign conducted by MDRS crew 76 and 77, focused on the investigation of surface processes in their geological context. Special emphasis was placed on sample collection and pre-screening using in-situ portable instruments. Science investigations included geological and geochemical measurements as well as detection and diagnostic of water, oxidants, organic matter, minerals, volatiles and biota.EuroGeoMars 2009 was an example of a Moon–Mars field research campaign dedicated to the demonstration of astrobiology instruments and a specific methodology of comprehensive measurements from selected sampling sites. We discuss in sequence: the campaign objectives and trade-off based on science, technical or operational constraints. This includes remote sensing data and maps, and geological context; the monitoring of environmental parameters; the geophysical context and mineralogy studies; geology and geomorphology investigations; geochemistry characterization and subsurface studies.We describe sample handling (extraction and collection) methods, and the sample analysis of soils and rocks performed in the MDRS laboratory using close inspection, initial petrological characterization, microscopy, Visible-NIR spectrometry, Raman spectrometry, X-ray diffraction/X-ray fluorescence spectrometry, soil analysis, electrochemical and biological measurements.The results from post-mission analysis of returned samples using advanced facilities in collaborator institutes are described in companion papers in this issue. We present examples of in-situ analysis, and describe an example investigation on the exploration and analysis of endolithic microbial mats (from reconnaissance, in-situ imaging, sampling, local analysis to post-mission sample analysis).


1977 ◽  
Vol 24 (1) ◽  
pp. 587-590 ◽  
Author(s):  
John A. Kirby ◽  
Lynn R. Anspaugh ◽  
Paul L. Phelps ◽  
George W. Huckabay ◽  
Frank Markwell ◽  
...  

Author(s):  
J. Kannan

Background: Sugarcane is one of the important commercial crops in India. Sugarcane trashes are considered as a problem to the farmers, because of the cost of labour for its disposal. Farmers wishes to compost in the field itself to reduce the cost. A field experiment was conducted for the in-situ composting of sugarcane trashes at the Sugarcane Research Station, Cuddalore. Methods: The sugarcane trashes have wide C:N ratio, which is not suitable for the microbial degradation. Hence, for the in-situ composting of sugarcane trashes, a combination of Rock phosphate: gypsum: urea in the ratio of 5:4:1 (named as SRS mixture) was added to narrow the C:N ratio. For the quick degradation, the microbial consortia namely Tamil Nadu Agricultural University Bio mineralizer, (TNAU Bio mineralizer) commercially available Effective Microbes (EM) solution and the cow dung slurry were compared. Result: During the degradation period, the pH was slightly reduced and subsequently increased to neutral; reduction in EC, organic carbon, Carbon: Nitrogen ratio and increase in the nitrogen content was also noted. Field soil analysis indicated increase in the primary nutrient content especially in the treatments with TNAU Bio mineralizer and commercial EM solution. For the in-situ composting of sugarcane trashes, SRS mixture 100 kg t-1 followed by TNAU bio mineralizer 2 kg t-1 may be applied immediately after the harvest of the canes.


2015 ◽  
Vol 16 (2) ◽  
pp. 438-448 ◽  
Author(s):  
Arnaud Robin Schneider ◽  
Benjamin Cancès ◽  
Clément Breton ◽  
Marie Ponthieu ◽  
Xavier Morvan ◽  
...  

Sign in / Sign up

Export Citation Format

Share Document