Investigating runoff generation on compacted subsoil using a field rainfall simulator

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21110%2F16%3A00304466" target="_blank" >RIV/68407700:21110/16:00304466 - isvavai.cz</a>

Result on the web

<a href="http://meetingorganizer.copernicus.org/EGU2016/EGU2016-1135.pdf" target="_blank" >http://meetingorganizer.copernicus.org/EGU2016/EGU2016-1135.pdf</a>

DOI - Digital Object Identifier

—

Result language

angličtina

Original language name

Investigating runoff generation on compacted subsoil using a field rainfall simulator

Original language description

Understanding the dominant runoff generation process is vital for both hydrologic and erosion field research and modelling. Although lateral subsurface stormflow and consecutive topsoil saturation are well known to be rather frequent, majority of the models still assume Hortonian runoff only. This assumption may be especially invalid in sloping arable land with compacted subsoil. At CTU in Prague a field rainfall simulator with 16 m2 experimental plots has been used for erosion and hydrologic research since 2012. Within early soil profile investigations in Bykovicky stream experimental catchment a compacted sandy-loam subsoil layer was identified, which was argued to affect greatly the overland runoff generation mechanism. Therefore the experimental setup was extended to capture the subsurface flow from a shallow cultivated topsoil. Eight sprinkling experiments of various rainfall intensities and durations ranging from 23 to 162 mm/hour and 60 to 155 minutes respectively were conducted from fall 2013 to summer 2015. Dynamics of subsurface flow, surface runoff and soil moisture in three depths was monitored. Various initial conditions of soil moisture and vegetation cover were represented in the experiments. While surface runoff did not form at lower intensities and the ponding time differed greatly at higher intensities depending on particular conditions, subsurface flow was observed in every simulation and started in average after 20–30 minutes. Both flow components interacted very fast, subsurface runoff forming from dominating part to one third of total runoff. Selected experiments were selected for consecutive modelling exploiting the subsurface moisture data. Both experimental and modelled results support the conceptual model of runoff formation on this particular site and suggest the necessity of considering the lateral flow in sites with similar conditions.

Czech name

—

Czech description

—

Type

O - Miscellaneous

CEP classification

DA - Hydrology and limnology

OECD FORD branch

—

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2016

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů