scholarly journals Relation between Infiltration Rate, Cover Materials and Hydraulic Conductivity of Forest Soils in Japanese Cedar and Hiba Arborvitae Plantation Forests under Artificial Rainfall in Ishikawa Prefecture, Japan

2018 ◽  
Author(s):  
Yoshitaka Komatsu
Keyword(s):  
Hydraulic Conductivity ◽  
Forest Soils ◽  
Japanese Cedar ◽  
Infiltration Rate ◽  
Plantation Forests ◽  
Artificial Rainfall ◽  
Ishikawa Prefecture

Simulating transient infiltration in unsaturated soils

1998 ◽  
Vol 35 (6) ◽  
pp. 1093-1100 ◽  
Author(s):  
J R McDougall ◽  
I C Pyrah
Keyword(s):  
Hydraulic Conductivity ◽  
Unsaturated Soils ◽  
Flow Model ◽  
Unsaturated Flow ◽  
Surface Region ◽  
Infiltration Rate ◽  
Soil Suction ◽  
Wetting Front ◽  
Near Surface ◽  
Unsaturated Hydraulic Conductivity

Transient responses to various infiltration events have been examined using an unsaturated flow model. Numerical simulations reveal a range of infiltration patterns which can be related to the ratio of infiltration rate to unsaturated hydraulic conductivity. A high value of this ratio reflects a prevailing hydraulic conductivity which cannot readily redistribute the newly infiltrated moisture. Moisture accumulates in the near-surface region before advancing down through the soil as a distinct wetting front. In contrast, low values of the ratio of rainfall to unsaturated hydraulic conductivity show minimal moisture accumulation, as the relatively small volumes of infiltrating moisture are readily redistributed through the soil profile.Key words: numerical modelling, infiltration, unsaturated soil, soil suction, groundwater.

scholarly journals Determination of Spatial and Temporal Variability of Soil Hydraulic Conductivity for Urban Runoff Modelling

Water ◽  
2019 ◽  
Vol 11 (5) ◽  
pp. 941 ◽  
Author(s):  
Matej Radinja ◽  
Ines Vidmar ◽  
Nataša Atanasova ◽  
Matjaž Mikoš ◽  
Mojca Šraj
Keyword(s):  
Hydraulic Conductivity ◽  
Temporal Variability ◽  
Water Repellency ◽  
Infiltration Rate ◽  
Control Measures ◽  
Soil Conditions ◽  
Spatial And Temporal Variability ◽  
Soil Hydraulic Conductivity ◽  
Soil Hydraulic

Soil hydraulic conductivity has a direct influence on infiltration rate, which is of great importance for modelling and design of surface runoff and stormwater control measures. In this study, three measuring techniques for determination of soil hydraulic conductivity were compared in an urban catchment in Ljubljana, Slovenia. Double ring (DRI) and dual head infiltrometer (DHI) were applied to measure saturated hydraulic conductivity (Ks) and mini disk infiltrometer (MDI) was applied to measure unsaturated hydraulic conductivity (K), which was recalculated in Ks in order to compare the results. Results showed significant differences between investigated techniques, namely DHI showed 6.8 times higher values of Ks in comparison to DRI. On the other hand, Ks values obtained by MDI and DRI exhibited the lowest difference. MDI measurements in 12 locations of the small plot pointed to the spatial variability of K ranging between 73%–89% as well as to temporal variability within a single location of 27%–99%. Additionally, a reduction of K caused by the effect of drought-induced water repellency was observed. Moreover, results indicate that hydrological models could be enhanced using different scenarios by employing a range of K values based on soil conditions.

Effects of skidding on forest soil infiltration in west-central Alberta

2000 ◽  
Vol 80 (4) ◽  
pp. 617-624 ◽  
Author(s):  
A. D. Startsev ◽  
D. H. McNabb
Keyword(s):  
Hydraulic Conductivity ◽  
Boreal Forests ◽  
Soil Water Potential ◽  
Infiltration Rate ◽  
Forest Harvesting ◽  
Saturated Hydraulic Conductivity ◽  
Soil Freezing ◽  
Surface Erosion ◽  
Soil Infiltration ◽  
Constant Head

Soil compaction during forest harvesting generally reduces macropore space, which reduces infiltration and increases the potential for surface erosion and waterlogging. Hydrological effects of 3, 7 and 12 skidding cycles and their persistence were evaluated for 3 yr at 14 sites, which represented a range of soil texture and compaction conditions in the foothills and boreal forests of Alberta. Saturated hydraulic conductivity (HC) was determined using a constant head method on soil cores collected from 5- and 10-cm depths; unconfined infiltration rate of the surface soil (IR) was measured in situ with tension infiltrometers at near saturation. A significant (P < 0.05) increase in bulk density during skidding caused a significant reduction in both HC and IR after the first three cycles at eight sites where soil water potential at the time of skidding was higher than −15 kPa; the decrease at the other sites was not significant. Additional traffic, up to 12 cycles, did not cause a further significant decrease in HC or IR. The infiltration rate of soil compacted by three skidding cycles showed a recovery trend. However, in more intensively trafficked soils, compaction effects on infiltration remained significant for at least 3 yr, which was possibly attributed to heavy snowpacks preventing soil freezing at lower depths. Key words: Saturated hydraulic conductivity, unconfined infiltration rate, tension infiltrometers, skidders, boreal forest, Alberta

scholarly journals Effect of Water Quality and Date Palm Biochar on Evaporation and Specific Hydrological Characteristics of Sandy Soil

Agriculture ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 300
Author(s):  
Arafat Alkhasha ◽  
Abdulrasoul Al-Omran ◽  
and Abdulaziz G. Alghamdi
Keyword(s):  
Water Quality ◽  
Soil Moisture ◽  
Hydraulic Conductivity ◽  
Date Palm ◽  
Saline Water ◽  
Sandy Soils ◽  
Infiltration Rate ◽  
Hydrological Characteristics ◽  
Arid Conditions ◽  
Cumulative Infiltration

Experiments were conducted in a soil laboratory using transparent columns (5 and 40 cm in diameter and length, respectively) to evaluate the effects of water quality (i.e., fresh or saline water) with the addition of biochar on soil moisture characteristics. Soil and biochar were gently combined and added into the top 10 cm of each column at a rate of 2%, 4%, 6%, and 8% (w/w). The results show a decrease in cumulative evaporation by 29.27%, 16.47%, 14.17%, and 14.61% with freshwater, and by 21.24%, 12.22%, 21.08%, and 12.67% with saline water for B1, B2, B3, and B4, respectively, compared with unamended soil (B1, B2, B3 and B4 represent the treatments with the biochar rate of 2, 4, 6, and 8%, respectively). Cumulative infiltration was reduced by 34.38%, 43.37%, 58.89%, and 57.07% with freshwater, and by 30.18%, 44.38%, 54.44%, and 49.11% with saline water for B1, B2, B3, and B4, respectively. The infiltration rate was reduced by 32.73%, 42.17%, 57.82%, and 56.85% with freshwater, and 42.09%, 54.6%1, 62.68%, and 58.41% with saline water for T1, T2, T3, and T4, respectively, compared with the control. The saturated hydraulic conductivity of B1 decreased significantly by 92.8% and 67.72% with fresh and saline water, respectively. Biochar, as a soil conditioner, could be used in arid conditions with fresh and saline water to enhance the hydrological properties of sandy soils.

Effect of Biological Clogging on Infiltration Rate in Soil Treatment Systems

1990 ◽  
Vol 22 (3-4) ◽  
pp. 101-108 ◽  
Author(s):  
Takuya Kawanishi ◽  
Hiroyuki Kawashima ◽  
Kazuyuki Chihara ◽  
Motoyuki Suzuki
Keyword(s):  
Hydraulic Conductivity ◽  
Numerical Model ◽  
Substrate Concentration ◽  
Infiltration Rate ◽  
Biomass Growth ◽  
Two Dimensional ◽  
Soil Hydraulic Conductivity ◽  
Percolation Rate ◽  
Flow Experiments ◽  
Biological Clogging

Effect of biomass on the soil hydraulic conductivity was clarified on andosol soil. The approximate value of the maximum allowable density of biomass was determined, which corresponds to the minimum hydraulic conductivity of the clogged andosol soil. On the basis of these values and the mass balance of the substrate, the relation among substrate concentration, thickness of clogged zone and the percolation rate was discussed. In addition, a numerical model was constructed, and the biomass growth and the change of permeability were simulated. Calculated results were compared with the results of two-dimensional infiltration flow experiments. By using the model, the conditions to avoid infiltration failure were determined.

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