Razvan Orza's research while affiliated with University of Bucharest and other places

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Publications (9)

Tools for the integrated management of mining areas and river basins
Poster
Full-text available
  • Oct 2017
The project had three objectives: Objective 1 To produce cost-effective tools for the evaluation of metals’ stocks and their mineralogical forms in tailing dams, Objective 2 To produce effective tools for the remediation of tailing dams, Objective 3 To develop innovative environmental services for the design of coupled monitoring systems and couple...
+10
Public georeferenced data sets for coupling plant scale and catchment scale processes
Conference Paper
Full-text available
  • Nov 2015
Producing large geo-referenced data sets for characterizing environmental variables is a major objective of the current national research programs. In Romania such public raw data sets are practically absent. In the framework of one past and two ongoing research projects we adopted a framework focusing the production of such data on coupled enviro...
Using the Near-surface Coherent Noise to Constrain 1D Resistivity Inversion
Article
  • Jun 2014
Resistivity data collected in towns or industrial settings suffers much in data quality because of the noise introduced by the infrastructural anthropic elements. The influence of this noise is heavily felt on the inversion process, where the obtained models can be far from reality and from the other in situ information available. Based on the laye...
Fig. 3.5 Eh–pH diagrams showing fields of common iron minerals (Garrels...
Fig. 3.2 Mobilization of particles by atmospheric fluxes is mostly...
Fig. 3.4 Macroscopic and microscopic aspects of the mineralization...
Fig. 3.8 Valea Mica tailing dam, Romania – Illustration of the surface...
+1 Fig. 3.7 Valea Mica tailing dam, Romania: apparent resistivity profile...
The Role of Mineralogy and Geochemistry in Hazard Potential Assessment of Mining Areas
Chapter
Full-text available
  • Jan 2012
The concept of hazard in the current interpretation of the regulations is directed to local and short term effects and its assessment is based on the distribution in space of the concentration of contaminants in abiotic and biotic compartments. We criticize this concept and introduce a potential hazard with full space-time dimension, i.e. from shor...
Integrated geophysical and geochemical investigations for identifying potable water sources on Ampoi Valley, Romania
Conference Paper
  • Sep 2011
The mining activities generate today the biggest pollution problems that the industry is facing. Zlatna mining region, Romania, was declared in the '90s the most polluted area in Europe. The primary goal of the study is to analyze the contamination in the studied area at the soil level, underground terrain, hydrological and hydrogeological systems,...
Single sensors versus hard-wired arrays in amplitude analysis
Conference Paper
  • Nov 2008
For decades, the hard‐wired arrays were used for the surface waves attenuation, known as the most difficult noise seen on the land seismic data. Lately, the fine sampled single sensors tend to replace the hard‐wired arrays in data acquisition. Modeling results showed that the signal‐to‐noise ratio of the hard‐wired array response is lower than that...
Preliminary paleomagnetic results from Neogene vocanics rocks (Eastern Carpathians)
Article
  • Jan 2006
In the Carpathian-Pannonian region in Neogene times, westward-dipping subduction in a land-locked basin caused collision of two lithospheric blocks with the southeastern border of the European plate. Calc-alkaline and alkaline magmatism was closely related to subduction, rollback, collision and extension. Previous paleomagnetic results (e.g. Panaio...

Citations

... An alternative solution is provided by the use of single-sensor recordings. Static corrections can be applied to single-sensor records and the use of these preprocessed single-sensor records for array-forming can preserve the reflection amplitudes (Orza and Panea 2008;Panea 2009). ...
Reference: Performance of seismic arrays in the presence of weathering layer variations
... On the other hand, roots help to prevent erosion by water and wind as well as leaching, carrying pollutants to groundwater (Carrasco et al. 2011). It is documented that the sources of metals available for wind dispersion are in general silty sand materials resulting from the separation through flotation of polymetallic ores and efflorescence salts (Jianu et al. 2012). Eapen et al. (2007) also claimed that phytostabilization is recommended in the case of tailing dams where post-flotation wastes (extremely harsh substrates for plant growth) were stored. ...
Reference: Effects of arbuscular mycorrhizal fungi on Agrostis capillaris grown on amended mine tailing substrate at pot, lysimeter, and field plot scales