|
|
Modeling water regime in a small watershed
Vogel, T. ; Tesař, Miroslav ; Císlerová, M.
The paper is focused on the role of the soil water regime in formation of subsurface runoff. One-dimensional dual-permeability model is used to simulate variably saturated movement of water in the soil, in which preferential flow effects were reported. Simulated pressure head variations are compared with the available tensiometric observations. A possible conceptual model of prevailing water transfer mechanism in a hillslope segment is presented. The shallow subsurface flow is approximated by one-dimensional saturated flow along the inclined soil-bedrock interface. For a selected growing season, the model generated hillslope hydrograph is compared with the observed stream hydrograph. The simulated subsurface runoff peaks compare well with the measured stream discharge peaks.
|
|
|
Soil water regime of the artic-alpine tundra of the Giant Mts. region, assessment and modelling
Tesař, Miroslav
This subproject deals with the soil moisture dynamics in the mountainous region of the Krkonoše (Giant) Mts. as a starting point for qualitative studies taking into account the newly developed discontinuous and essentially nonhomogenous approach to the soil water regime character. As precise as possible identification of the accumulation and percolation phases of the soil water regime should be the main result of the soil water regime observation. The attention is also paid: (i) to the study and description of the runoff from a watershed formation taking into account the soil moisture dynamics and storage as an important factor affecting surface runoff formation; (ii) to the determination of the influence of the land-use changes on the soil water regime.
|
|
|
The rainfall-runoff formation from a small catchment
Tesař, Miroslav ; Šír, Miloslav ; Syrovátka, Oldřich ; Bayer, T. ; Eliáš, Václav
We dedicate this contribution to the question how the relation of outflow of water from the soil into the transport collector determined by hydropedological methods bears with the discharge at the closure profile of a small forest catchment in the course of a vegetation season. In connection with this phenomena we investigate how much is such catchment homogenous. The monitored catchments Liz and Albrechtec are sloping, their geological subsoil is formed of impermeable bottom and they don't contain significant parts with ground water level. The soil cover is composed of several horizons with different aquifer properties, but the precipitated water largely infiltrates downwards the soil, so that a surface and subsurface runoff angle wise downhill to the watercourse is a very rare phenomena which appears at catastrophic rains only. The forest stand is represented by spruce. The both catchments are located in the elevation from 700 to 1000 m a.s.l. in the mountain region of Šumava.
|
|
|
Water Balance of the Soil Profile of the Headwater Region in the Krkonoše (Giant Mts)
Tesař, Miroslav ; Šír, Miloslav ; Syrovátka, Oldřich ; Dvořák, I.
The present article deals with the soil water regime of the mountainous localities in the Krkonoše (Giants) Mts. (mountainous meadow and dwarf pine forest). Both localities lie at the Labská louka region at the right bank of the Labe river at the elevation of about 1360 m a.s.l. Soil water regime is described by the time course of the soil water storage and outflow of water below the soil profile. The long-term water balance of the soil profile was composed in the form of the cumulative lines of precipitation, evapotranspiration and outflow of water below the soil profile to the substratum. Evapotranspiration was estimated with the help of the energy balance of the plant cover based on the global radiation input and air temperature close to the soil profile. Outflow of water below the soil profile to the substratum was determined using the tensiometric soil moisture monitoring. Soil water storage was recalculated with the use of retention curves from time series of tensiometric data sets. Rainfall totals were measured using the standard rain gauge.
|
|
| |
|
| |
guest ::
