Hydraulic conductivity variation in chilean volcanic soils due to wheeling and management

Abstract

To describe the effect of wheeling on saturated hydraulic conductivity (ks), undisturbed soil samples from an Andisol were collected at three depths In Chilean soil classification system Andisols are defined as Malihue at the 2 sites minor and mayor mechanical stresses were applied repeatedly and the hydraulic properties determined for all depths.The saturated hydraulic conductivity Ks was reduced due to wheeling but the magnitude depended on the speed and load during wheeling. In addition, also the pore size distribution was reduced both in total but also in size classes. Smaller values of Ks were observed in Site 2 where low speed and low tire inflation pressure were applied, while the traffic induces a reduction of the pore associated to a reduced functionality of the porous system. To assess these qualitative changes and soil behaviour, measurements like hydraulic conductivity (ks) are a good tool to describe the physical quality of a soil.

The mudflow disaster at Villa Santa Lucía in Chilean Patagonia: understandings and insights derived from numerical simulation and postevent field surveys

“…Flo-2D is a two-dimensional finite-differences model (FLO-2D, 2018;O'Brien and Zhao, 2004) that simulates non-Newtonian flow. The model creates simulations in complex topographies, urbanized areas, and floodplains, allowing fluid exchange between the channels and the floodplain.…”

“…The model creates simulations in complex topographies, urbanized areas, and floodplains, allowing fluid exchange between the channels and the floodplain. It can model water flows, hyperconcentrated sediment flows, and mudflows (FLO-2D, 2018;O'Brien and Zhao, 2004). The input data required are a digital topography of the land, the geometry of the channel, estimated values of the channel roughness and the flood plain, liquid and solid inputs, precipitation, and rheological properties of the water-sediment mixture.…”

Livestock Grazing Reduces Soil Quality and Threatens Recovery of a Degraded Andean Araucaria Forest.

“…Experimental evidence indicates that K sat is determined by the large pores space rather than the micropores (Alaoui et al,2011), strongly linked to soil structure (Dorner et al, 2012). Thus, changes in saturated hydraulic conditions may help us understand possible changes in pore space's continuity and distribution (Cuevas et al, 2013). The effect of cattle trampling causes a predisposition for finer soil particle losses by wind and water erosion (Huang et al, 2007;Krummelbein et al, 2009;Su et al, 2004), causing a redistribution of pore continuity in the topsoil thus impairing water flow and conductivity.…”

Water Repellency of Monument Soil Treated by Tung Oil

“…Meanwhile, the hydraulic conductivity of treated soil is significantly lower than that of untreated soil at the same dry density. This can be explained by the fact that the hydraulic conductivity is not only influenced by pore size and porosity, but also influenced by pore space connectivity (Cuevas et al 2013;Neithalath et al 2010). It was found that Tung oil film can well adapt to the contour and closely coat on soil particles and can fill in the pores of soil (Li and Zhang 2012).…”