Hydro-geomorphic assessment of flood hazards and sediment transport dynamics in a rapidly urbanizing river basin using remote sensing and GIS (Case study: [insert local basin])

Project Abstract

In rapidly urbanizing river basins, flood hazards and sediment transport dynamics are reshaped by land-use change, impervious surface expansion, and altered hydrological responses, necessitating an integrated geo-spatial approach to risk assessment and watershed management. This study presents a hydro-geomorphic assessment that combines remote sensing, Geographic Information Systems (GIS), and hydrological modeling to quantify flood susceptibility and sediment flux under current and projected land-use scenarios in a case study basin placeholder. High-resolution multispectral satellite imagery and time-series digital elevation models are employed to map geomorphic features, channel morphology, and floodplain dynamics, while land cover classification and impervious surface mapping quantify urbanization progression. A distributed hydrological model is calibrated and validated using observed rainfall, streamflow, and sediment load measurements to simulate peak discharge, flood extents, and sediment transport rates across baseline and urbanization scenarios. Sediment yield is estimated through integrated end-member analysis and transport capacity approaches, incorporating shear stress, channel width, vegetation cover, and bank stability to evaluate destabilization risks. The research further analyzes geomorphic responses such as channel incision, floodplain aggradation, and bank erosion using change detection techniques on multi-temporal DEMs and synthetic aperture radar (SAR) data to capture subsidence and surface deformations associated with urban growth. Results indicate that urban expansion amplifies peak discharges, advances floodwave timing, and elevates sediment delivery to downstream reaches due to reduced infiltration, enhanced surface runoff, and heightened conduit variability. Spatially explicit risk maps identify hotspot zones where infrastructure, housing, and critical facilities are most vulnerable to flooding and sediment inundation. The study investigates feedback mechanisms between hydrological extremes and river morphology, revealing threshold-driven regime shifts in channel planform and valley fill under sustained urban pressure. Scenario analysis under different climate and land-use trajectories demonstrates potential mitigation pathways, including green-blue infrastructure retrofit, restoration of riparian buffers, sediment management through upstream retention basins, and enforcement of zoning practices that preserve hydrological connectivity. Uncertainty analysis addresses data limitations, sensor fusion errors, and model parameter sensitivity to urban parameters such as leakages, drainage density, and impervious fraction. The work contributes to methodological advancements by integrating remote sensing-derived geomorphic indicators with physics-based and empirical sediment transport models to deliver a robust framework for forecasting flood hazards and sediment flux in evolving basins. Policy implications emphasize proactive land-use planning, flood risk communication, and adaptive management strategies that harmonize urban development with riverine processes. Finally, the research offers a scalable template applicable to similar basins, enabling stakeholders to simulate, monitor, and mitigate hydromorphological risks in the face of rapid urbanization and climate variability.

Project Overview

What This Project Is About

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This project looks at how floods form and move sediment in a river basin that is rapidly becoming urban. It uses simple mapping and data tools to understand how changes in land use and rainfall affect flood risks and the way sediment travels along the river.

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The Problem It Addresses

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Urban growth often changes how water flows and sediment is carried, which can increase flood damage and degrade waterways. The project fills gaps in local flood risk understanding by linking landscape changes with river behavior in one basin.

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Objectives of the Project

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1. Identify how urbanization changes river channels and flood pathways.
2. Analyze historical flood events and sediment movement patterns.
3. Assess current flood risk under future land-use scenarios.
4. Provide practical recommendations for land-use planning and flood mitigation.

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What You Will Do Step by Step

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Step 1: Collect basic data about the river basin (maps, rainfall, land use).

Step 2: Use simple remote sensing images to see land changes over time.

Step 3: Map flood-prone areas and trace sediment paths along the river.

Step 4: Combine the information to identify key factors driving floods and sediment movement.

Step 5: Interpret results with plain-language explanations and visuals for stakeholders.

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Expected Outcome

Expect clear maps and explanations showing how urban growth affects floods and sediment transport, plus actionable guidance for planners to reduce flood risk and protect water quality.