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| Created: | Feb 22, 2026 at 3:44 a.m. (UTC) | |
| Last updated: | Feb 27, 2026 at 7:22 a.m. (UTC) | |
| Citation: | See how to cite this resource | |
| Content types: | Model Instance Content |
| Sharing Status: | Discoverable |
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Abstract
This HydroShare resource contains a calibrated Soil and Water Assessment Tool (SWAT) model developed to assess how land-use change influences river turbidity and sediment dynamics across major watersheds in Fiji. The model integrates high-resolution topography, climate, soil, and land-use data to quantify spatial and temporal variability in surface runoff, sediment yield, and turbidity under multiple scenarios. Baseline conditions representing the 2010–2019 period were established using ERA5-Land meteorological data and on-site gauges , soil maps, and satellite-derived land-cover information. Subsequent scenarios simulate deforestation, agricultural expansion, urban development, and reforestation to evaluate how different land-use transitions affect water quality in key catchments such as the Sigatoka Rivers.This model supports watershed-management and policy evaluation efforts aimed at reducing sediment-related degradation of water supply. All input data, model configuration, and post-processing scripts are included to ensure transparency and reproducibility for future hydrological and land-use impact studies in Pacific island contexts.
Subject Keywords
Coverage
Spatial
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Content
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| Readme | # Fiji River Basin SWAT Model ### Title: SWAT Model for Evaluating the Effects of Land Use Change on River Turbidity in Fiji **Author:** Suraj Shah **Affiliation:** School of Civil and Environmental Engineering, University of New South Wales **Contact:** [suraj.shah@unsw.edu.au](mailto:suraj.shah@unsw.edu.au) **HydroShare DOI:** _(assigned upon publication)_ **Model Version:** 1.0 **Date:** 2025-11-25 --- ## 1. Overview This repository contains a calibrated **Soil and Water Assessment Tool (SWAT)** model developed to evaluate the impacts of land-use change on river turbidity and sediment yield across major catchments in **Fiji**. The model integrates high-resolution topography, soil, and climate datasets to quantify spatial and temporal variability in runoff, sediment yield, and turbidity under baseline and alternative land-use scenarios. Baseline conditions representing the **2010–2020** period were established using ERA5-Land meteorological data, PSP soil maps, and land-use classifications derived from satellite imagery. Subsequent scenarios simulate **deforestation, agricultural expansion, urbanization, and reforestation** to assess their influence on sediment yield and water quality in key rivers. --- ## 2. Study Area - **Region:** Fiji Islands (primarily Viti Levu and Vanua Levu) - **Latitude Range:** −21° to −15° - **Longitude Range:** 176° E to 182° E - **Major Rivers:** Rewa, Ba, Navua, Sigatoka, Labasa, and others - **Hydrological Units:** Delineated using 30 m SRTM DEM, threshold = _(insert area threshold in km²)_ --- ## 3. Objectives 1. Quantify baseline turbidity and sediment load under current (2015) land-use conditions. 2. Simulate projected land-use change scenarios (e.g., forest → agriculture → urban). 3. Evaluate changes in river turbidity and sediment yield at sub-basin outlets. 4. Support watershed-management and policy evaluation for sediment-related degradation of coastal and freshwater ecosystems in Fiji. --- ## 4. Model Setup and Inputs - **SWAT Version:** SWAT2012 Rev 681 (or SWAT+ 2023, depending on final build) - **Watershed Delineation:** Fiji DEM clipped to 0.1° buffer beyond basin boundary. - **Land-Use Data:** PSP or ESA CCI Land Cover (2015–2020) reclassified to SWAT codes. - **Soil Data:** Fiji-PSP Soil Maps (FAO format, harmonized to SWAT database). - **Climate Inputs:** - Precipitation: ERA5-Land or IMERG (hourly aggregated to daily) - Temperature: ERA5-Land daily Tmin/Tmax - Solar Radiation, Humidity, Wind Speed: ERA5-Land hourly 0.1° grid - **Observed Data:** Discharge and turbidity from Water Authority of Fiji (WAF) and the Hydrology Section. |
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People or Organizations that contributed technically, materially, financially, or provided general support for the creation of the resource's content but are not considered authors.
| Name | Organization | Address | Phone | Author Identifiers |
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| Suraj Shah | University of New South Wales, Australia | NSW, AU | +610402887479 |
How to Cite
This resource is shared under the Creative Commons Attribution CC BY.
http://creativecommons.org/licenses/by/4.0/
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