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<!-- SIGNAL_EARTH_INFOBOX_START --> {| class="wikitable" style="float:right; clear:right; margin:0 0 1em 1em; width:320px;" |+ SIGNAL Earth Structured Data |- ! Object type | Causal Mechanism |- ! SIGNAL Earth ID | CMECH-0012 |- ! Mechanism family | erosion and sediment transport |- ! Role | Reusable causal pathway |- ! Mapped causal edges | 32 |- ! Article priority | Shared Mechanism Article |- ! Article status | Published |- ! Review status | Proposed |} <!-- SIGNAL_EARTH_INFOBOX_END --> describe the processes by which soil, sediment, and particulate materials are detached, mobilized, and moved by water, wind, or other forces, subsequently affecting downstream environmental conditions such as water quality, habitat structure, and turbidity. This mechanism explains how upstream disturbances or natural events influence downstream sediment-related Damage Signals through physical causality rather than accounting or proxy relationships. == Signal Relationships == Upstream Damage Signals such as burned area, extreme precipitation intensity, and land conversion contribute to increased soil erosion rates and sediment-laden runoff. These in turn elevate sediment fluxes to rivers and coasts, raising suspended sediment concentrations in freshwater systems. Elevated sediment transport affects downstream signals including freshwater ecosystem condition, water clarity, heavy metal concentrations, and coastal erosion extent. The relationships are primarily physical, involving the detachment, transport, and deposition of particulate material, rather than being artifacts of measurement or normalization. == Mechanism Pathway == The pathway begins with the detachment of soil or sediment particles from the land surface due to forces such as raindrop impact, surface runoff, or wind. Vegetation cover, soil structure, and land use influence susceptibility to erosion. Mobilized particles enter transport pathways—overland flow, river channels, or coastal currents—where they are carried downstream. Sediment delivery ratios determine the proportion of eroded material reaching aquatic systems. Suspended sediments may adsorb contaminants like heavy metals, affecting water quality. Altered sediment transport fluxes modify habitat substrates and turbidity, influencing ecosystem health and physical features such as shoreline stability. == Scientific Basis == The mechanism is grounded in geomorphology, hydrology, and sedimentology, supported by empirical observations and modeling studies. Raindrop impact and runoff energy are established drivers of soil particle detachment. Sediment transport dynamics are well-characterized in fluvial and coastal systems, with sediment delivery ratios and fluxes quantifying material movement. The adsorption of pollutants onto sediments and their downstream transport is documented in environmental chemistry literature. Remote sensing and in situ measurements provide data on burned areas, erosion rates, suspended sediment concentrations, and related variables. == Scope and Boundary Conditions == This mechanism applies to terrestrial and aquatic environments where particulate material is subject to mobilization and transport. It encompasses water-driven erosion primarily but includes wind-driven processes linked to dust aerosol generation. The influence of anthropogenic activities such as mining, land conversion, and infrastructure development is included where they alter surface conditions or sediment pathways. The mechanism does not cover chemical transformations independent of sediment transport or biological processes unrelated to physical sediment dynamics. == Lag and Persistence == Erosion and sediment transport responses can exhibit short lags following triggering events like storms or fires, with sediment pulses occurring during or shortly after such events. Persistent changes may arise from sustained land use changes or infrastructure that alter sediment sources or transport routes. Sediment deposited in floodplains or reservoirs may be remobilized later, extending the temporal influence. The duration and timing of effects depend on event magnitude, landscape characteristics, and hydrological connectivity. == Thresholds and Nonlinearities == Nonlinear responses occur when thresholds in vegetation cover, soil saturation, or storm intensity are crossed, leading to disproportionate increases in erosion and sediment transport. For example, fire can abruptly remove protective vegetation, sharply increasing erosion rates. Similarly, extreme precipitation events may exceed infiltration capacity, causing runoff and sediment mobilization that scales nonlinearly with rainfall intensity. Sediment delivery ratios may change abruptly with channel connectivity alterations, affecting downstream sediment fluxes. == Uncertainty and Contestability == Uncertainties arise from spatial heterogeneity in soil properties, vegetation, and land use, as well as temporal variability in weather and hydrological conditions. Measurement errors in erosion rates and sediment concentrations contribute to uncertainty. The relative importance of different drivers can vary regionally, and interactions with biological and chemical processes complicate attribution. Some relationships, such as sediment-associated contaminant transport, depend on site-specific geochemistry, leading to contestability in generalized interpretations. == Related Signal Edges == * [[Burned area (annual)|DS-00007 Burned area (annual)]] --amplifies--> [[Soil erosion rate (water-driven)|DS-00029 Soil erosion rate (water-driven)]] * [[Coal extraction rate|DS-00033 Coal extraction rate]] --contributes_to--> [[Sediment-laden runoff to receiving waters|DS-00804 Sediment-laden runoff to receiving waters]] * DS-00720 Extreme precipitation intensity --contributes_to--> DS-00746 Freshwater suspended sediment concentration * DS-00720 Extreme precipitation intensity --contributes_to--> [[Soil erosion rate (water-driven)|DS-00029 Soil erosion rate (water-driven)]] * DS-00746 Freshwater suspended sediment concentration --contributes_to--> [[Heavy Metal Concentration (e.g., Hg)|DS-00170 Heavy metal concentration (e.g., Hg)]] * DS-00746 Freshwater suspended sediment concentration --dampens--> [[Lake Secchi Depth (Water Clarity)|DS-00136 Lake Secchi depth (water clarity)]] * [[Marine construction disturbance from offshore energy infrastructure|DS-00835 Marine construction disturbance from offshore energy infrastructure]] --contributes_to--> [[Sediment Transport Flux|DS-00173 Sediment transport flux]] * [[Primary copper ore extraction rate|DS-00035 Primary copper ore extraction rate]] --contributes_to--> [[Sediment-laden runoff to receiving waters|DS-00804 Sediment-laden runoff to receiving waters]] * DS-00768 Road runoff contaminant load --contributes_to--> DS-00746 Freshwater suspended sediment concentration * DS-00745 Sediment delivery ratio --causes--> [[Sediment flux to rivers/coasts|DS-00145 Sediment flux to rivers/coasts]] * [[Sediment flux to rivers/coasts|DS-00145 Sediment flux to rivers/coasts]] --causes--> DS-00746 Freshwater suspended sediment concentration * [[Sediment Transport Flux|DS-00173 Sediment transport flux]] --contributes_to--> DS-00723 Coastal erosion extent * [[Sediment Transport Flux|DS-00173 Sediment transport flux]] --contributes_to--> DS-00790 Freshwater ecosystem condition index * [[Sediment transport interruption from impoundment infrastructure|DS-00826 Sediment transport interruption from impoundment infrastructure]] --contributes_to--> DS-00790 Freshwater ecosystem condition index * [[Sediment transport interruption from impoundment infrastructure|DS-00826 Sediment transport interruption from impoundment infrastructure]] --contributes_to--> [[Sediment Transport Flux|DS-00173 Sediment transport flux]] * [[Sediment-laden runoff to receiving waters|DS-00804 Sediment-laden runoff to receiving waters]] --contributes_to--> DS-00746 Freshwater suspended sediment concentration * [[Sediment-laden runoff to receiving waters|DS-00804 Sediment-laden runoff to receiving waters]] --contributes_to--> DS-00787 Freshwater suspended sediment load index * DS-00773 Significant wave height --contributes_to--> DS-00723 Coastal erosion extent * DS-00744 Soil degradation severity index --amplifies--> [[Soil erosion rate (water-driven)|DS-00029 Soil erosion rate (water-driven)]] * [[Soil erosion rate (water-driven)|DS-00029 Soil erosion rate (water-driven)]] --contributes_to--> DS-00745 Sediment delivery ratio * [[Tailings Mass Generated Rate|DS-00036 Tailings mass generated rate]] --contributes_to--> [[Sediment-laden runoff to receiving waters|DS-00804 Sediment-laden runoff to receiving waters]] * DS-00767 Urban stormwater contaminant load --contributes_to--> DS-00746 Freshwater suspended sediment concentration * DS-00723 Coastal erosion extent --contributes_to--> [[Sediment flux to rivers/coasts|DS-00145 Sediment flux to rivers/coasts]] * DS-00721 Coastal storm surge height --contributes_to--> DS-00723 Coastal erosion extent * DS-00726 Desertification severity index --contributes_to--> DS-00727 Dust aerosol concentration * DS-00725 Dryland vegetation cover fraction --dampens--> DS-00727 Dust aerosol concentration * DS-00722 Extreme wind intensity --contributes_to--> DS-00723 Coastal erosion extent * [[Global mean sea level|DS-00003 Global mean sea level]] --contributes_to--> DS-00723 Coastal erosion extent * [[Soil erosion rate (water-driven)|DS-00029 Soil erosion rate (water-driven)]] --contributes_to--> DS-00775 Pesticide runoff concentration * [[Sediment-laden runoff to receiving waters|DS-00804 Sediment-laden runoff to receiving waters]] --causes--> [[Sediment flux to rivers/coasts|DS-00145 Sediment flux to rivers/coasts]] * [[Land conversion to cropland rate (anthropogenic; annual estimate; declared boundary)|DS-00196 Land conversion to cropland rate (anthropogenic; annual estimate; declared boundary)]] --contributes_to--> [[Sediment-laden runoff to receiving waters|DS-00804 Sediment-laden runoff to receiving waters]] * [[Marine construction disturbance from offshore energy infrastructure|DS-00835 Marine construction disturbance from offshore energy infrastructure]] --contributes_to--> DS-00723 Coastal erosion extent == Related Signal Nodes == * [[Burned area (annual)|DS-00007 Burned area (annual)]] * [[Soil erosion rate (water-driven)|DS-00029 Soil erosion rate (water-driven)]] * [[Coal extraction rate|DS-00033 Coal extraction rate]] * [[Sediment-laden runoff to receiving waters|DS-00804 Sediment-laden runoff to receiving waters]] * DS-00720 Extreme precipitation intensity * DS-00746 Freshwater suspended sediment concentration * [[Heavy Metal Concentration (e.g., Hg)|DS-00170 Heavy metal concentration (e.g., Hg)]] * [[Lake Secchi Depth (Water Clarity)|DS-00136 Lake Secchi depth (water clarity)]] * [[Marine construction disturbance from offshore energy infrastructure|DS-00835 Marine construction disturbance from offshore energy infrastructure]] * [[Sediment Transport Flux|DS-00173 Sediment transport flux]] * [[Primary copper ore extraction rate|DS-00035 Primary copper ore extraction rate]] * DS-00768 Road runoff contaminant load * DS-00745 Sediment delivery ratio * [[Sediment flux to rivers/coasts|DS-00145 Sediment flux to rivers/coasts]] * DS-00723 Coastal erosion extent * DS-00790 Freshwater ecosystem condition index * [[Sediment transport interruption from impoundment infrastructure|DS-00826 Sediment transport interruption from impoundment infrastructure]] * DS-00787 Freshwater suspended sediment load index * DS-00773 Significant wave height * DS-00744 Soil degradation severity index * [[Tailings Mass Generated Rate|DS-00036 Tailings mass generated rate]] * DS-00767 Urban stormwater contaminant load * DS-00721 Coastal storm surge height * DS-00726 Desertification severity index * DS-00727 Dust aerosol concentration * DS-00725 Dryland vegetation cover fraction * DS-00722 Extreme wind intensity * [[Global mean sea level|DS-00003 Global mean sea level]] * DS-00775 Pesticide runoff concentration * [[Land conversion to cropland rate (anthropogenic; annual estimate; declared boundary)|DS-00196 Land conversion to cropland rate (anthropogenic; annual estimate; declared boundary)]] == Key Researchers / Contributors to the Literature == * Researchers contributing to geomorphology and sediment transport modeling * Authors of the 2017 Nature Communications assessment on global soil erosion * Contributors to the 2022 Science article on global river suspended sediment flux * Maintainers of the ESA FireCCI burned area products * Authors of the Global Tailings Review (ICMM/UNEP/PRI) * Researchers involved in studies of sediment-associated contaminant transport * Provisional; requires steward review == Sources and Key Academic Articles == * [https://www.nature.com/articles/s41467-017-02142-7 Borrelli et al. 2017. An assessment of the global impact of 21st century land use change on soil erosion. Nature Communications] * [https://doi.org/10.1126/science.abn7980 Syvitski et al. 2022. Rapid changes to global river suspended sediment flux by humans. Science. https://www.science.org/doi/10.1126/science.abn7980] * [https://climate.esa.int/en/projects/fire/ ESA FireCCI burned area products] * [https://globaltailingsreview.org/ Global Tailings Review (ICMM/UNEP/PRI] * [https://doi.org/10.1016/j.jhazmat.2007.09.012 Rico et al. 2008. Tailings dam failures dataset. Journal of Hazardous Materials. https://doi.org/10.1016/j.jhazmat.2007.09.012] * [https://www.sciencedirect.com/science/article/abs/pii/S0013935124013458 Comprehensive review on toxic heavy metals in the environment and their removal from aquatic environment by phytoremediation and plant-growth-promoting bacteria. 2024. ScienceDirect] * Provisional; requires steward review == Wikipedia Context == Wikipedia provides general background on erosion and sediment transport as physical processes shaping landscapes and aquatic systems. This SIGNAL article focuses specifically on how these processes operate as causal mechanisms linking upstream Damage Signals such as burned area and extreme precipitation to downstream impacts on sediment flux, water quality, and ecosystem condition within the SIGNAL causal graph framework. * https://en.wikipedia.org/wiki/Erosion * https://en.wikipedia.org/wiki/Sediment_transport * https://en.wikipedia.org/wiki/Soil_erosion * https://en.wikipedia.org/wiki/Sediment
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