Drivers and the socio-economic context of soil erosion

Climate

Climate and weather are among the most important drivers of soil erosion by water. The amount, intensity, and timing of precipitation determine how much energy is available to detach and transport soil particles, while temperature influences soil conditions and hydrological processes that affect erosion risk.

Rainfall intensity is a key factor in splash erosion. During intense storms, raindrops strike the soil surface with greater force, dislodging soil particles and making them vulnerable to transport. High-intensity rainfall can also generate infiltration-excess overland flow, which occurs when rain falls faster than the soil can absorb it. The excess water flows across the surface, increasing its potential to detach and transport soil particles.

Total rainfall amount is equally important because it influences how much runoff is generated. After prolonged or repeated rainfall, soils may become saturated, meaning all soil pores are filled with water. Under these conditions, additional rainfall cannot infiltrate and instead flows over the surface as saturation-excess overland flow. This runoff can mobilize large quantities of sediment, particularly on sloping land.

In regions with cold winters, temperature plays a major role in soil erosion processes. Repeated freeze-thaw cycles weaken soil structure by expanding and contracting water within the soil, making soil particles more susceptible to detachment. During spring, melting snow and frozen or partially frozen soils often limit infiltration, generating substantial amounts of overland flow. These snowmelt events can produce significant erosion and sediment transport, even in the absence of intense rainfall.

Climate influences erosion not only through individual weather events but also through seasonal patterns and long-term climate conditions. Areas experiencing frequent heavy rainfall, rapid snowmelt, or strong freeze-thaw cycles often face greater erosion risks and require appropriate soil conservation measures to protect land and water resources.