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Related Experiment Video

Updated: Jul 2, 2025

Capturing Flow-weighted Water and Suspended Particulates from Agricultural Canals During Drainage Events

Capturing Flow-weighted Water and Suspended Particulates from Agricultural Canals During Drainage Events

Published on: November 7, 2017

Exploring hydrological controls on dissolved organic carbon export dynamics in a typical flash flood catchment using

Yue Wu¹, Hang Su¹, Lei Cheng¹

¹State Key Laboratory of Water Resources Engineering and Management, Wuhan University, Wuhan 430072, China; Hubei Provincial Collaborative Innovation Centre for Water Resources Security, Wuhan 430072, China.

The Science of the Total Environment

|February 25, 2024

Summary

Dissolved organic carbon (DOC) export from headwater catchments is complex. This study used a process-based model to show how storm intensity shifts DOC sources, highlighting hydrology's role in regulating carbon export.

Keywords:

DOC fluxes Flow pathways High-frequency measurement INCA-C model Storm intensity

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Area of Science:

Hydrology
Biogeochemistry
Environmental Science

Background:

Dissolved organic carbon (DOC) export from headwater catchments is crucial for global carbon cycling.
Previous studies often used statistical models, obscuring process-level understanding of runoff and DOC dynamics.
Understanding the coupling between runoff generation and DOC export is essential.

Purpose of the Study:

To simulate high-frequency discharge and DOC export dynamics using a process-based model.
To investigate the influence of storm intensity on DOC export pathways and sources.
To elucidate the role of hydrological pathways in regulating DOC storm exports.

Main Methods:

Utilized the INCA-C process-based model for hourly simulation of discharge and DOC export.
Analyzed data from a 1.8 km² flash flood experimental headwater catchment.
Evaluated model performance using Nash-Sutcliffe efficiency (NSE) for discharge and DOC concentrations.

Main Results:

The INCA-C model successfully captured hourly discharge and DOC concentration dynamics.
DOC fluxes exhibited distinct dynamics and varied contributions from four flow pathways based on storm intensity.
At higher storm intensities, subsurface flow from organic soil dominated DOC export, with greater peaks and shorter time-to-peaks.
DOC sources shifted from mineral layer subsurface runoff during moderate events to organic layer subsurface runoff during extreme events.

Conclusions:

Hydrological pathway controls and DOC dynamic patterns shift with storm intensity.
Different flow pathways exert distinct and variable controls on DOC export.
Process-based modeling is vital for understanding how hydrology regulates DOC storm exports.