Development and Application of a QGIS-Based Model to Estimate Monthly Streamflow

Abstract

Changes in rainfall pattern and land use have caused considerable impacts on the hydrological behavior of watersheds; a Long-Term Hydrologic Impact Analysis (L-THIA) model has been used to simulate such variations. The L-THIA model defines curve number according to the land use and hydrological soil group before calculating the direct runoff based on the amount of rainfall, making it a convenient method of analysis. Recently, a method was proposed to estimate baseflow using this model, which may be used to estimate the overall streamflow. Given that this model considers the spatial distribution of land use and hydrological soil groups and must use rainfall data at multiple positions, it requires the usage of a geographical information system (GIS). Therefore, a model that estimates streamflow using land use maps, hydrologic soil group maps, and rain gauge station maps in QGIS, a popular GIS software, was developed. This model was tested in 15 watersheds.

A Delaunay Edges and Simulated Annealing-Based Integrated Approach for Mesh Router Placement Optimization in Wireless Mesh Networks

“…The mesh clients in the simulation are set in the buildings considered as evacuation areas. We used the QGIS [ 38 ], which is a GIS application to visualize geographic information. In addition, we used the shapefiles of buildings from OpenStreetMap (OSM) [ 39 ] and the open data released by Kurashiki City [ 40 ].…”

Potential Erosion in Mining, Oil Palm Plantations, and Watersheds Reforestation Areas

“…Zhou et al [19] implied that rainfall-induced land loss is caused by poor land use and its alterations. To calculate fundamental flow, sub-watershed land use area, and rainfall-induced flow, land use maps, sub-watershed maps, maps of rain measuring stations, and rainfall data are required [33]. While various erosion control practices have been proposed and implemented, their efficacy and long-term viability remain uncertain.…”