Sources of major ions and processes affecting the geochemical and isotopic signatures of subsurface waters along a tropical river, Southwestern India

2014 ◽  
Vol 73 (1) ◽  
pp. 333-346 ◽  
Author(s):  
G. P. Gurumurthy ◽  
K. Balakrishna ◽  
M. Tripti ◽  
Jean Riotte ◽  
Stéphane Audry ◽  
...  
Keyword(s):  
Major Ions ◽  
Tropical River ◽  
Isotopic Signatures ◽  
Subsurface Waters ◽  
Southwestern India

Use of Sr isotopes as a tool to decipher the soil weathering processes in a tropical river catchment, southwestern India

2015 ◽  
Vol 63 ◽  
pp. 498-506 ◽  
Author(s):  
G.P. Gurumurthy ◽  
K. Balakrishna ◽  
M. Tripti ◽  
Jean Riotte ◽  
Stéphane Audry ◽  
...  
Keyword(s):  
Sr Isotopes ◽  
Tropical River ◽  
River Catchment ◽  
Soil Weathering ◽  
Weathering Processes ◽  
Southwestern India

scholarly journals Chemical weathering and carbon dioxide consumption in a small tropical river catchment, southwestern India

2021 ◽  
Author(s):  
Baby Krishnan Nisha ◽  
Keshava Balakrishna ◽  
Harikripa Narayana Udayashankar ◽  
Busnur Rachotappa Manjunatha
Keyword(s):  
Carbon Dioxide ◽  
Western Ghats ◽  
Chemical Weathering ◽  
Small Rivers ◽  
Humid Climate ◽  
Tropical River ◽  
River Catchment ◽  
River Catchments ◽  
The Western Ghats ◽  
Southwestern India

AbstractStudies done on small tropical west-flowing river catchments located in the Western Ghats in southwestern India have suggested very intense chemical weathering rates and associated CO2 consumption. Very less studies are reported from these catchments notwithstanding their importance as potential sinks of atmospheric CO2 at the global scale. A total of 156 samples were collected from a small river catchment in the southwestern India, the Payaswini–Chandragiri river Basin, during pre-monsoon, monsoon and post-monsoon seasons in 2016 and 2017, respectively. This river system comprises two small rivers originating at an elevation of 1350 m in the Western Ghats in peninsular India. The catchment area is dominated by biotite sillimanite gneiss. Sodium is the dominant cation, contributing ~ 50% of the total cations, whereas HCO3− contributes ~ 75% of total anions. The average anion concentration in the samples varied in the range HCO3− > Cl− > SO42− > NO3− > F−, whereas major cation concentration varied in the range Na+  > Ca2+  > Mg2+  > K+. The average silicate weathering rate (SWR) was 42 t km−2 y−1 in the year 2016 and 36 t km−2 y−1 in 2017. The average annual carbon dioxide consumption rate (CCR) due to silicate rock weathering was 9.6 × 105 mol km−2y−1 and 8.3 × 105 mol km−2 y−1 for 2016 and 2017, respectively. The CCR in the study area is higher than other large tropical river catchments like Amazon, Congo-Zaire, Orinoco, Parana and Indus because of its unique topography, hot and humid climate and intense rainfall.

scholarly journals Assessment of Heavy Metals Pollution and Stable Isotopic Signatures in Hard Rock Aquifers of Krishnagiri District, South India

Geosciences ◽  
2019 ◽  
Vol 9 (5) ◽  
pp. 200 ◽  
Author(s):  
S. Manikandan ◽  
S. Chidambaram ◽  
M. V. Prasanna ◽  
Rakesh Roshan Ganayat
Keyword(s):  
Heavy Metals ◽  
Hard Rock ◽  
Major Ions ◽  
Pollution Index ◽  
Pollution Indices ◽  
Degree Of Contamination ◽  
Isotopic Signatures ◽  
Groundwater Samples ◽  
Metal Levels ◽  
Hard Rock Aquifers

The area chosen for study, Krishnagiri district, has a hard rock terrain and the aquifers located there are sparsely recharged by limited rainfall. The study area has a complex geology with hard rock aquifers. To have an overall view of the trace metals concentration in the groundwater of the study area, 39 groundwater samples were collected during Post Monsoon (POM) representing various lithologies. pH, EC, TDS, major ions and 22 heavy metals were analyzed for all the samples. Ca-Cl is the dominant water facies in the groundwater, which indicates the dissolution of ions by local precipitation. The analysis shows the dominance of trace metal levels in groundwater as follows: Zn > Ba > Sr > Fe > Al > B > Mn > Cu > Pb > Ni > V > Li > Rb > Cr > Mo > Se > As > Co > Cd > Ag > Sb > Be. The pollution indices, namely the heavy metal pollution index (HPI) and degree of contamination (Cd) were calculated to assess the drinking and agriculture water usage. The pollution indices show that 2% of samples are polluted with respect to HPI and 3% with respect to the degree of contamination. The heavy metals (Al-Cr-Mn-Fe-Ni-Co-Zn-Ba-Pb) in groundwater show significant correlations with these indices, suggesting that they are affected by weathering of rock matrix with less anthropogenic impact. Stable isotopes (Oxygen and Hydrogen) were analyzed to identify the possible recharge mechanisms in the groundwater. It has been identified that recharge is mainly due to the local precipitation, which is the result of release metals in the groundwater through weathering.

Dissolved trace element biogeochemistry of a tropical river, Southwestern India

2012 ◽  
Vol 20 (6) ◽  
pp. 4067-4077 ◽  
Author(s):  
M Tripti ◽  
G P Gurumurthy ◽  
K Balakrishna ◽  
M D Chadaga
Keyword(s):  
Trace Element ◽  
Tropical River ◽  
Southwestern India

scholarly journals Assessment of Water Quality of a Tropical River with Special Reference to Ions

2020 ◽  
pp. 97-116 ◽  
Author(s):  
R. V. Sheeja ◽  
A. M. Sheela ◽  
S. Jaya ◽  
Sabu Joseph
Keyword(s):  
River Water ◽  
Major Ions ◽  
Anthropogenic Activities ◽  
Anthropogenic Pollution ◽  
Control Measures ◽  
Water Type ◽  
Ion Chemistry ◽  
Major Ion Chemistry ◽  
Tropical River ◽  
Major Ion

The role of ions in a tropical river water (Neyyar, Kerala) was assessed. Rock weathering is the dominating mechanism controlling the major ion chemistry of Neyyar river. The dominance of Cl-HCO3-Na during monsoon indicates that geology plays a major role in controlling water chemistry. The presence of mineral varieties of quartz, feldspars, pyroxene, biotite, etc., in the Pre-Cambrian crystalline namely Khondalite and Charnockites, could be the source of major ions. The major ion chemistry of Neyyar river waters show that Na is the dominant cation with lower proportions of Mg and Ca, with HCO3 and Cl as the dominant anions. It belongs to the HCO3 group with significant amounts of Na and Cacations. The dominance of Cl-HCO3-Ca and Ca-HCO3-Cl during post monsoon and pre monsoon respectively indicates that besides geology, the land drainage and anthropogenic activities also control river water. The change in water type observed during monsoon from Na-Cl-HCO3 to Na-Ca-Cl-HCO3 almost from the middle portion may be attributed to anthropogenic pollution. Hence attention is to be paid to take the control measures to prevent the pollution in this stretch of the river.

Geochemical behaviour of dissolved trace elements in a monsoon-dominated tropical river basin, Southwestern India

2013 ◽  
Vol 21 (7) ◽  
pp. 5098-5120 ◽  
Author(s):  
G. P. Gurumurthy ◽  
K. Balakrishna ◽  
M. Tripti ◽  
Stéphane Audry ◽  
Jean Riotte ◽  
...  
Keyword(s):  
Trace Elements ◽  
River Basin ◽  
Tropical River ◽  
Geochemical Behaviour ◽  
Dissolved Trace Elements ◽  
Southwestern India

Spatio-temporal variability of trace metals and major ions in a small tropical river, southwest coast of India

2019 ◽  
Vol 191 (11) ◽  
Author(s):  
D’Souza Nishitha ◽  
Yerabham Praveenkumarreddy ◽  
Neloy Khare ◽  
Harikripa Narayana Udayashankar ◽  
Keshava Balakrishna
Keyword(s):  
Trace Metals ◽  
Temporal Variability ◽  
Major Ions ◽  
Tropical River ◽  
Southwest Coast Of India ◽  
Southwest Coast ◽  
Spatio Temporal

Controls on intense silicate weathering in a tropical river, southwestern India

2012 ◽  
Vol 300-301 ◽  
pp. 61-69 ◽  
Author(s):  
G.P. Gurumurthy ◽  
K. Balakrishna ◽  
Jean Riotte ◽  
Jean-Jacques Braun ◽  
Stéphane Audry ◽  
...  
Keyword(s):  
Silicate Weathering ◽  
Tropical River ◽  
Southwestern India

Limnological characteristics, community metabolism and management strategies of a coastal sinkhole in Cuba (Cenote Jennifer)

2020 ◽  
Vol 56 ◽  
pp. 24
Author(s):  
Roberto González-De Zayas ◽  
Liosban Lantigua Ponce de León ◽  
Liezel Guerra Rodríguez ◽  
Felipe Matos Pupo ◽  
Leslie Hernández-Fernández
Keyword(s):  
Hydrogen Sulfide ◽  
Primary Productivity ◽  
Major Ions ◽  
Saline Water ◽  
Management Strategies ◽  
Tourist Destination ◽  
Community Metabolism ◽  
Morphological Studies ◽  
Made In ◽  
Limnological Parameters

The Cenote Jennifer is an important and unique aquatic sinkhole in Cayo Coco (Jardines del Rey Tourist Destination) that has brackish to saline water. Two samplings were made in 1998 and 2009, and 4 metabolism community experiments in 2009. Some limnological parameters were measured in both samplings (temperature, salinity, pH, dissolved oxygen major ions, hydrogen sulfide, nutrients and others). Community metabolism was measured through incubated oxygen concentration in clear and dark oxygen bottles. Results showed that the sinkhole limnology depends on rainfall and light incidence year, with some stratification episodes, due to halocline or oxycline presence, rather than thermocline. The sinkhole water was oligotrophic (total nitrogen of 41.5 ± 22.2 μmol l−1 and total phosphorus of 0.3 ± 0.2 μmol l−1) and with low productivity (gross primary productivity of 63.0 mg C m−2 d−1). Anoxia and hypoxia were present at the bottom with higher levels of hydrogen sulfide, lower pH and restricted influence of the adjacent sea (2 km away). To protect the Cenote Jennifer, tourist exploitation should be avoided and more resources to ecological and morphological studies should be allocated, and eventually use this aquatic system only for specialized diving. For conservation purposes, illegal garbage disposal in the surrounding forest should end.

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