Hydrological connectivity for synergism between environmental flow and water quality in urban river-lake system

Journal of Environmental Management, Journal Year: 2025, Volume and Issue: 381, P. 125300 - 125300

Published: April 11, 2025

Language: Английский

Integrating AHP and GIS for Sustainable Surface Water Planning: Identifying Vulnerability to Agricultural Diffuse Pollution in the Guachal River Watershed

Sustainability, Journal Year: 2025, Volume and Issue: 17(9), P. 4130 - 4130

Published: May 2, 2025

Diffuse agricultural pollution is a leading contributor to surface water degradation, particularly in regions undergoing rapid land use change and intensification. In many developing countries, conventional assessment approaches fall short of capturing the spatial complexity cumulative nature multiple environmental drivers that influence vulnerability. This study addresses this gap by introducing Integral Index Vulnerability Contamination (IIVDC), spatially explicit, multi-criteria framework combines Analytical Hierarchy Process (AHP) with Geographic Information Systems (GIS). The IIVDC integrates six key indicators—slope, soil erodibility, use, runoff potential, hydrological connectivity, observed quality—weighted through expert elicitation mapped at high resolution. methodology was applied Guachal River watershed Valle del Cauca, Colombia, where pressures are pronounced. Results indicate 33.0% exhibits vulnerability 4.3% very vulnerability, critical zones aligned steep slopes, limited vegetation cover, strong connectivity cultivated areas. By accounting for both biophysical attributes pollutant transport pathways, offers replicable tool prioritizing management interventions. Beyond its technical application, contributes sustainability enabling evidence-based decision-making resource protection planning. It supports integrated, targeted actions can reduce long-term contamination risks, guide sustainable practices, improve institutional capacity governance. approach suited contexts data but planning essential. Future refinement should consider dynamic quality monitoring validation across contrasting hydro-climatic enhance transferability.

Language: Английский

Hydrological connectivity shape the nitrogen pollution sources and microbial community structure in a river-lake connected system

Frontiers in Microbiology, Journal Year: 2025, Volume and Issue: 16

Published: April 11, 2025

Intensified agricultural and urban activities have exacerbated nitrogen pollution, posing a severe threat to freshwater ecosystems, particularly under intensified urbanization activities. This study systematically examined Baiyangdian Lake (BYD) its principal inflowing rivers, namely Fu River (FH), Baigouyin (BGY), Xiaoyi (XY) characterize the spatio-temporal distribution, primary sources, impact on sediment microbial community structure. Results indicated pronounced seasonal variations in both pollution loads with riverine levels rising markedly from dry season (May) wet (August). Atmospheric deposition accounted for 43.9% of input season, whereas fertilizers sewage contributed 23.3 26.4%, respectively. Additionally, communities exhibited distinct temporal spatial patterns, significantly higher diversity species richness being during season. The, composition shifted, as evidenced by decline Proteobacteria increases Firmicutes Actinobacteriota . River-lake connectivity emerged critical factor, FH displaying notably index compared BGY XY rivers. Structural equation modeling (SEM) analysis further revealed that river-lake was positively correlated negatively α-diversity. These findings demonstrated directly influenced concentrations, which turn indirectly modulated diversity.

Language: Английский