Statistical Contrast Analysis of Hydrochemical Parameters Upstream of the Tidal Influence in Two AMD-Affected Rivers

Physico-Chemical Influence of Surface Water Contaminated by Acid Mine Drainage on the Populations of Diatoms in Dams (Iberian Pyrite Belt, SW Spain)

“…The waters emerging from inside the galleries, as well as the leachates from the waste dumps of the mines are heavily contaminated. Thus, acid mine drainage from these mines merges into a network of tributaries and sub-tributaries [35], until AMD eventually reaches the main two rivers: Tínto and Odiel.…”

Determination of the extreme reduction of concrete strength due to acid mine drainage by laboratory tests on specimens located in a real environment

“…To understand the situation in which the specimens were placed, the parameters determined by [33] for years (from 2002 to 2006) are summarized (Table 2), taking into account that the months form July to September correspond to the dry season, while the months from October to January are within the rainy season. In addition, it should be noted that the authors of this work have found lower pH values (-1.56 [34] and 1.32 [35]) and sulphate content higher than those found where the specimens were placed (16000 mg/L [36], 45000 mg/L [1] and 114322 mg/L [34]), which means even more aggressive situations in AMD environments. Once the ideal location to carry out the experiment was decided, it was necessary to establish the dosage and requirements of the samples.…”

Proposal of precipitation–dissolution models in a channel affected by acid mine drainage in the Iberian Pyrite Belt during torrential rain regimes

“…Theses functions applied to the series studied show the value for correlations between each variable on 1 day and the same variable on the previous days. Theses tools have been widely used for hydrochemical characterisation [10,12,14], which allows a numerical estimation of the resistance of a mass of water, to a change in its physico-chemical characteristic, to an external stimulus [15]. In this sense, the present results highlight the resistance to physical-chemical changes of water until 3 days after the external stimuli act.…”

“…In the area studied, the occurrence of AMD phenomena in rivers that flow into reservoirs geared towards urban supply means that waters arrive with low pH and high metal and sulphate load, as in the case of the Meca River that collects its waters from the Tharsis Mining Complex (Fig. 1), creating a unique scenario extraordinarily affected by acidity, sulphates and metal load [9,11,16,18,[28][29][30].…”