scholarly journals Fractal behavior of soil water storage at multiple depths

2016 ◽  
Author(s):  
Wenjun Ji ◽  
Mi Lin ◽  
Asim Biswas ◽  
Bing C. Si ◽  
Henry W. Chau ◽  
...  
Keyword(s):  
Surface Layer ◽  
Soil Water ◽  
Management Practices ◽  
Surface Soil ◽  
Fractal Theory ◽  
Water Storage ◽  
Water Dynamics ◽  
Soil Water Storage ◽  
Scaling Properties ◽  
Deep Layers

Abstract. Spatio-temporal behavior of soil water is essential to understand the science of hydrodynamics. Data intensive measurement of surface soil water using remote sensing has established that the spatial variability of soil water can be described using the principle of self-similarity (scaling properties) or fractal theory. This information can be used in determining land management practices provided the surface scaling properties hold at deep layer. Current study examined the scaling properties of sub-surface soil water and its relationship to surface soil water, thereby serving as the supporting information for the plant root and vadose zone models. Soil water storage (SWS) down to 1.4 m depth at seven equal intervals was measured along a transect of 576 m for 5 years. The surface SWS showed multifractal nature only during the wet period (from snowmelt until mid to late June with large SWS) indicating the need of multiple scaling indices in transferring soil water variability information over multiple scales. However, with increasing depth, the SWS became monofractal in nature indicating the need of single scaling index to upscale/downscale soil water variability information. The dynamic nature made the surface layer soil water in the wet period highly variable compared to the deep layers. In contrast, all soil layers during the dry period (from late June to the end of the growing season with low SWS) were monofractal in nature, probably resulting from the high evapotranspirative demand of the growing vegetation that surpassed other effects. This strong similarity between the scaling properties at the surface layer and deep layers provides the possibility of inferring about the whole profile soil water dynamics using the scaling properties of the easy-to-measure surface SWS data.

scholarly journals Fractal behavior of soil water storage at multiple depths

2016 ◽  
Vol 23 (4) ◽  
pp. 269-284 ◽  
Author(s):  
Wenjun Ji ◽  
Mi Lin ◽  
Asim Biswas ◽  
Bing C. Si ◽  
Henry W. Chau ◽  
...  
Keyword(s):  
Soil Water ◽  
Management Practices ◽  
Surface Soil ◽  
Multiple Scales ◽  
Fractal Theory ◽  
Water Storage ◽  
Water Dynamics ◽  
Soil Water Storage ◽  
Scaling Properties ◽  
Deep Layers

Abstract. Spatiotemporal behavior of soil water is essential to understand the science of hydrodynamics. Data intensive measurement of surface soil water using remote sensing has established that the spatial variability of soil water can be described using the principle of self-similarity (scaling properties) or fractal theory. This information can be used in determining land management practices provided the surface scaling properties are kept at deep layers. The current study examined the scaling properties of sub-surface soil water and their relationship to surface soil water, thereby serving as supporting information for plant root and vadose zone models. Soil water storage (SWS) down to 1.4 m depth at seven equal intervals was measured along a transect of 576 m for 5 years in Saskatchewan. The surface SWS showed multifractal nature only during the wet period (from snowmelt until mid- to late June) indicating the need for multiple scaling indices in transferring soil water variability information over multiple scales. However, with increasing depth, the SWS became monofractal in nature indicating the need for a single scaling index to upscale/downscale soil water variability information. In contrast, all soil layers during the dry period (from late June to the end of the growing season in early November) were monofractal in nature, probably resulting from the high evapotranspirative demand of the growing vegetation that surpassed other effects. This strong similarity between the scaling properties at the surface layer and deep layers provides the possibility of inferring about the whole profile soil water dynamics using the scaling properties of the easy-to-measure surface SWS data.

scholarly journals The influence of stony soil properties on water dynamics modeled by the HYDRUS model

2018 ◽  
Vol 66 (2) ◽  
pp. 181-188 ◽  
Author(s):  
Hana Hlaváčiková ◽  
Viliam Novák ◽  
Zdeněk Kostka ◽  
Michal Danko ◽  
Jozef Hlavčo
Keyword(s):  
Soil Water ◽  
Water Retention ◽  
Water Storage ◽  
Water Dynamics ◽  
Soil Water Storage ◽  
Rock Fragments ◽  
Soil Fraction ◽  
Fine Soil ◽  
Stony Soil ◽  
Water Retention Properties

AbstractStony soils are composed of two fractions (rock fragments and fine soil) with different hydrophysical characteristics. Although stony soils are abundant in many catchments, their properties are still not well understood. This manuscript presents an application of the simple methodology for deriving water retention properties of stony soils, taking into account a correction for the soil stoniness. Variations in the water retention of the fine soil fraction and its impact on both the soil water storage and the bottom boundary fluxes are studied as well. The deterministic water flow model HYDRUS-1D is used in the study. The results indicate that the presence of rock fragments in a moderate-to-high stony soil can decrease the soil water storage by 23% or more and affect the soil water dynamics. Simulated bottom fluxes increased or decreased faster, and their maxima during the wet period were larger in the stony soil compared to the non-stony one.

Safflower productivity as related to soil water storage and management practices in semiarid regions

2001 ◽  
Vol 32 (17-18) ◽  
pp. 2851-2862 ◽  
Author(s):  
Alberto R. Quiroga ◽  
Martín Díaz-Zorita ◽  
Daniel E. Buschiazzo
Keyword(s):  
Soil Water ◽  
Management Practices ◽  
Water Storage ◽  
Soil Water Storage ◽  
Semiarid Regions

Characterisation of a windbreak system on the south coast of Western Australia. 3. Soil water and hydrology

2002 ◽  
Vol 42 (6) ◽  
pp. 729 ◽  
Author(s):  
D. J. M. Hall ◽  
R. A. Sudmeyer ◽  
C. K. McLernon ◽  
R. J. Short
Keyword(s):  
Ground Water ◽  
Soil Water ◽  
Western Australia ◽  
Surface Soil ◽  
Water Storage ◽  
Time Domain Reflectometry ◽  
Water Levels ◽  
Soil Water Storage ◽  
Neutron Moisture ◽  
Water Contents

This paper describes changes in soil water and ground water at various distances from a Pinus pinaster windbreak in south-western Australia. Soil water contents were measured by neutron moisture meter and time domain reflectometry at distances from a windbreak ranging from 1 to 20 tree heights (H). Within 3 H of the windbreak, soil water storage was reduced by 100–153 mm/1.8 m when compared to unsheltered conditions (20 H) over the 4 years of the experiment. Beyond 3 H, no significant differences in soil water storage were found which could be related to microclimate modification. Relationships between surface soil water storage (mm/0.4 m) at <6�H and 12–24 H were 1 : 1 regardless of the technique used. Similarly, soil water depletion within the crop rootzone (mm/0.6 m) was similar at distances >3 H. Reductions in the depth and duration of perched water levels occurred within 4 H of the windbreak. Despite this, the windbreaks had no effect on the regional ground-water levels.

scholarly journals Soil-water dynamics and unsaturated storage during snowmelt following wildfire

2012 ◽  
Vol 9 (1) ◽  
pp. 441-483
Author(s):  
B. A. Ebel ◽  
E. S. Hinckley ◽  
D. A. Martin
Keyword(s):  
Water Content ◽  
Soil Water ◽  
Soil Water Content ◽  
Water Storage ◽  
Field Capacity ◽  
Water Dynamics ◽  
Soil Water Storage ◽  
Soil Water Dynamics ◽  
Near Surface ◽  
Snowmelt Period

Abstract. Many forested watersheds with a substantial fraction of precipitation delivered as snow have the potential for landscape disturbance by wildfire. Little is known about the immediate effects of wildfire on snowmelt and near-surface hydrologic responses, including soil-water storage. Montane systems at the rain-snow transition have soil-water dynamics that are further complicated during the snowmelt period by strong aspect controls on snowmelt and soil thawing. Here we present data and analysis from field measurements of snow hydrology and subsurface hydrologic and temperature responses during the first winter and spring after the September 2010 Fourmile Canyon Fire in Colorado, USA. Our observations of soil-water content and soil temperature show sharp contrasts in hydrologic and thermal conditions between north- and south-facing slopes. South-facing burned soils were ~1–2 °C warmer on average than north-facing burned soils and ~1.5 °C warmer than south-facing unburned soils, which affected soil thawing during the snowmelt period. Soil-water dynamics also differed by aspect: in response to soil thawing, soil-water content increased approximately one month earlier on south-facing burned slopes than on north-facing burned slopes. While aspect and wildfire affect soil-water dynamics during snowmelt, soil-water storage at the end of the snowmelt period reached the value at field capacity for each plot, suggesting that post-snowmelt unsaturated storage was not substantially influenced by aspect in wildfire-affected areas. Our data and analysis indicate that snowmelt-driven groundwater recharge may be larger in wildfire-impacted areas, especially on south-facing slopes, because of earlier soil thaw and longer durations of soil-water contents above field capacity in those areas.

scholarly journals Soil-water dynamics and unsaturated storage during snowmelt following wildfire

2012 ◽  
Vol 16 (5) ◽  
pp. 1401-1417 ◽  
Author(s):  
B. A. Ebel ◽  
E. S. Hinckley ◽  
D. A. Martin
Keyword(s):  
Water Content ◽  
Soil Water ◽  
Soil Water Content ◽  
Water Storage ◽  
Field Capacity ◽  
Water Dynamics ◽  
Soil Water Storage ◽  
Soil Water Dynamics ◽  
Near Surface ◽  
Snowmelt Period

Abstract. Many forested watersheds with a substantial fraction of precipitation delivered as snow have the potential for landscape disturbance by wildfire. Little is known about the immediate effects of wildfire on snowmelt and near-surface hydrologic responses, including soil-water storage. Montane systems at the rain-snow transition have soil-water dynamics that are further complicated during the snowmelt period by strong aspect controls on snowmelt and soil thawing. Here we present data from field measurements of snow hydrology and subsurface hydrologic and temperature responses during the first winter and spring after the September 2010 Fourmile Canyon Fire in Colorado, USA. Our observations of soil-water content and soil temperature show sharp contrasts in hydrologic and thermal conditions between north- and south-facing slopes. South-facing burned soils were ∼1–2 °C warmer on average than north-facing burned soils and ∼1.5 °C warmer than south-facing unburned soils, which affected soil thawing during the snowmelt period. Soil-water dynamics also differed by aspect: in response to soil thawing, soil-water content increased approximately one month earlier on south-facing burned slopes than on north-facing burned slopes. While aspect and wildfire affect soil-water dynamics during snowmelt, soil-water storage at the end of the snowmelt period reached the value at field capacity for each plot, suggesting that post-snowmelt unsaturated storage was not substantially influenced by aspect in wildfire-affected areas. Our data and analysis indicate that the amount of snowmelt-driven groundwater recharge may be larger in wildfire-impacted areas, especially on south-facing slopes, because of earlier soil thaw and longer durations of soil-water contents above field capacity in those areas.

scholarly journals Response of Soil Water Dynamics to Rainfall on A Collapsing Gully Slope: Based on Continuous Multi-Depth Measurements

Water ◽  
2020 ◽  
Vol 12 (8) ◽  
pp. 2272
Author(s):  
Zhi-Yun Jiang ◽  
Xue-Dan Wang ◽  
Si-Yi Zhang ◽  
Bin He ◽  
Xiao-Li Zhao ◽  
...  
Keyword(s):  
Response Time ◽  
Soil Water ◽  
Water Storage ◽  
Water Dynamics ◽  
Soil Water Storage ◽  
Soil Water Dynamics ◽  
Rainfall Events ◽  
Middle Slope ◽  
Collapsing Gully ◽  
Upper Slope

Soil water conditions play an important role in the formation of a collapsing gully, but we are still at the early stages of understanding how the soil water changes on the slope after different rainfall events due to a lack of high-frequency continuous field observations. This study aimed to reveal the response of soil water dynamics to rainfall events for different slope aspects and positions based on continuous multi-depth observations of soil water on a typical collapsing gully slope from 2017 to 2019 in Wuhua County, Guangdong Province, China. The vegetation characteristics and soil properties were investigated, and the storage of soil water was also calculated. The results showed that the dynamics and storage of soil water varied with the slope aspect, slope position and vegetation cover. The response time of the soil water to intensive rainfall events on the sunny slope was shorter than that on the shady slope, while soil water storage in the sunny slope was significantly lower than in the shady slope (p < 0.01). For the different slope positions, the soil water response time to the intensive rainfall events on the upper slope was shorter than that in the middle slope, while the soil water storage in the middle slope was significantly higher than on the upper slope. This was mainly due to the redistribution runoff from the upper slope to middle slope, delaying the process by which rainwater infiltrated into the soil layers. Moreover, vegetation significantly allayed the response of soil water dynamics to an intensive rainfall event but increased the storage of soil water, owing to the protection of soil surface from rain and conservation of high soil clay content. The bare area in the middle position of the sunny slope was speculated to be the potential source of the collapsing gully because it lacked the cover of vegetation. Our findings highlight the importance of soil water dynamics on the formation of a collapsing gully and provided valuable insights for the optimization of soil conservation and management practices for collapsing erosion.

scholarly journals Multifractal detrended fluctuation analysis in examining scaling properties of the spatial patterns of soil water storage

2012 ◽  
Vol 19 (2) ◽  
pp. 227-238 ◽  
Author(s):  
A. Biswas ◽  
T. B. Zeleke ◽  
B. C. Si
Keyword(s):  
Soil Water ◽  
Detrended Fluctuation Analysis ◽  
Water Storage ◽  
Soil Water Storage ◽  
Fluctuation Analysis ◽  
Multifractal Detrended Fluctuation Analysis ◽  
Scaling Properties ◽  
Scaling Property ◽  
Detrended Fluctuation ◽  
Properties Of Soil

Abstract. Knowledge about the scaling properties of soil water storage is crucial in transferring locally measured fluctuations to larger scales and vice-versa. Studies based on remotely sensed data have shown that the variability in surface soil water has clear scaling properties (i.e., statistically self similar) over a wider range of spatial scales. However, the scaling property of soil water storage to a certain depth at a field scale is not well understood. The major challenges in scaling analysis for soil water are the presence of localized trends and nonstationarities in the spatial series. The objective of this study was to characterize scaling properties of soil water storage variability through multifractal detrended fluctuation analysis (MFDFA). A field experiment was conducted in a sub-humid climate at Alvena, Saskatchewan, Canada. A north-south transect of 624-m long was established on a rolling landscape. Soil water storage was monitored weekly between 2002 and 2005 at 104 locations along the transect. The spatial scaling property of the surface 0 to 40 cm depth was characterized using the MFDFA technique for six of the soil water content series (all gravimetrically determined) representing soil water storage after snowmelt, rainfall, and evapotranspiration. For the studied transect, scaling properties of soil water storage are different between drier periods and wet periods. It also appears that local controls such as site topography and texture (that dominantly control the pattern during wet states) results in multiscaling property. The nonlocal controls such as evapotranspiration results in the reduction of the degree of multiscaling and improvement in the simple scaling. Therefore, the scaling property of soil water storage is a function of both soil moisture status and the spatial extent considered.

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