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Boma, Deserius
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Earth & Planetary Sciences Engineering Environmental Science Physics

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Lithological Control on Variations in Total Dissolved Solids (TDS) and pH of Auya River Water, Obano Area, Paniai Regency , Central Papua Boma, Deserius; Mote, Dance
Journal of Geoscience, Engineering, Environment, and Technology Vol. 11 No. 1 (2026): JGEET Vol 11 No 01 : March (2026)
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jgeet.2026.11.1.27493

Abstract

This study focuses on the study of the influence of lithology and the level of rock weathering on the water quality of the Auya River located in Obano District, Paniai Regency, Central Papua, using Total Dissolved Solids (TDS) and pH as the main indicators. The approach applied is a quantitative descriptive method, which was carried out through field surveys at six observation points, direct measurement of water quality parameters, and statistical analysis including descriptive statistics, Pearson correlation, and linear regression. The results of the study indicate an increasing trend in TDS and pH values from upstream to downstream, which is related to changes in lithology from intrusive igneous rocks to sedimentary rocks, accompanied by an increase in weathering intensity. The correlation test shows a very strong relationship between TDS and pH (r = 0.975), as well as a significant relationship between water quality parameters with lithology and weathering levels. The results of the regression analysis show that lithology contributes to TDS variations by (84.1%), while the level of weathering affects pH variations by (71.4%). These findings confirm that geological factors play a dominant role in controlling the hydrogeochemical characteristics of river water through the process of mineral dissolution and ion release. Furthermore, the presence of sulfide minerals such as pyrite contributes to increased dissolved ions through natural oxidation processes. Furthermore, anthropogenic activities also contribute to variations in water quality. TDS (17–63 mg/L) and pH (6.6–7.9) indicate that the Auya River water quality remains within clean water quality standards. This study emphasizes the importance of geological aspects as a basis for water quality management in areas with high geological complexity.
Spatial Variation of Physicochemical Characteristics of Auya River Water in Relation to Geological Conditions, Paniai Regency, Central Papua, Indonesia Boma, Deserius; Sukiyah, Emi; Syah Alam, Boy Yoseph Cahya Sunan Sakti
Journal of Geoscience, Engineering, Environment, and Technology Vol. 11 No. 3 (2026): JGEET Vol 11 No 03 : September (2026)
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jgeet.2026.11.3.30300

Abstract

This study aims to analyze the spatial variation of the physicochemical characteristics of Auya River water and its relationship to geological conditions in Paniai Regency, Central Papua. In situ measurements were conducted at 20 stations (ST01–ST20) from upstream to downstream for Total Dissolved Solids (TDS), pH, Electrical Conductivity (EC), and temperature. Based on field conditions, the stations were grouped into Intrusive Igneous Rock (ST01–ST05), Siltstone (ST06–ST10), and Sand (ST11–ST20). Data were analyzed using descriptive statistics, One-Way ANOVA, Welch ANOVA, Tukey HSD, Pearson correlation, and partial correlation by controlling for cumulative distance. The results showed TDS 25–153 mg/L, pH 6.50–7.77, EC 48–166 µS/cm, and temperature 16.80–20.20 °C, with an increasing trend from upstream to downstream. One-Way ANOVA showed significant differences between groups for TDS, pH, EC, and temperature (p < 0.001). Tukey's test showed that all pairs of groups differed significantly in TDS, pH, and EC, while temperature between Intrusive Igneous Rock and Siltstone was not significantly different (p = 0.073). Pearson's correlation showed a very strong positive relationship between parameters (r = 0.969–0.985; p < 0.001), but the coefficient decreased after cumulative distance was controlled. These findings suggest that the physicochemical characteristics of the water form spatial gradients that coincide with changes in geological conditions. Because the geological groups are also arranged in an upstream–downstream sequence, these statistical differences are interpreted as geological–spatial associations, not evidence of an independent influence of lithology. Thus, variations in the Auya River water likely reflect the combined contributions of geological conditions, longitudinal position, solute accumulation, elevation, and environmental factors along the river course, which also need to be considered in hydrogeochemical interpretations.
Co-Authors Boy Yoseph Cahya Sunan Sakti Syah Alam Emi Sukiyah Mote, Dance