Soil Properties and Moisture Movement in the Unsaturated Zone

2016 ◽  
pp. 149-190
Keyword(s):  
Soil Properties ◽  
Unsaturated Zone ◽  
Moisture Movement

Soil Properties and Moisture Movement in the Unsaturated Zone

2006 ◽  
pp. 6-1-6-59 ◽  
Author(s):  
Rafael Angulo-Jaramillo ◽  
Randel Haverkamp ◽  
Samuel Debionne ◽  
Pierre Viallet ◽  
Devaraj de Condappa
Keyword(s):  
Soil Properties ◽  
Unsaturated Zone ◽  
Moisture Movement

Soil Properties and Moisture Movement in the Unsaturated Zone

1998 ◽  
Author(s):  
Randell Haverkamp ◽  
Faycal Bouraoui ◽  
Christian Zammit ◽  
Rafael Angulo-Jaramillo
Keyword(s):  
Soil Properties ◽  
Unsaturated Zone ◽  
Moisture Movement

Factors Controlling the Distribution and Fate of Nitrate in the Unsaturated Zone and Groundwater in a Semiarid Agriculture Area

2012 ◽  
Vol 518-523 ◽  
pp. 4892-4895
Author(s):  
Su Fen Wang ◽  
Tian Ming Huang ◽  
Ji Lai Liu ◽  
Yu Long Liu
Keyword(s):  
Soil Moisture ◽  
Water Table ◽  
Unsaturated Zone ◽  
Water Quality Management ◽  
Nitrate Pollution ◽  
Movement Direction ◽  
Nitrate Content ◽  
Movement Velocity ◽  
Moisture Movement ◽  
Pollute Groundwater

Overuse of fertilizers in agriculture could cause groundwater nitrate pollution. However, this is related to nitrate input, soil moisture movement (direction and rate), and depth of water table in (semi)arid areas, where nitrate can be preserved and nitrate loss by denitrification can be limited. A 18-m soil profile to water table in Daxing, Beijing shows that the nitrate is accumulated in the upper unsaturated zone and has not reached water table; and then groundwater nitrate remains at baseline level (5.6 mg/L). The soil moisture movement velocity is 0.28 m/yr based on nitrate use history. It takes another ~35 years for the moisture with high nitrate content to reach water table and pollute groundwater, to which attention should be paid in water quality management.

A Conceptual Model of Soil Moisture Movement in Seasonal Frozen Unsaturated Zone

2011 ◽  
Vol 90-93 ◽  
pp. 2612-2618 ◽  
Author(s):  
Si Miao Sun ◽  
Chang Lei Dai ◽  
Hou Chu Liao ◽  
Di Fang Xiao
Keyword(s):  
Soil Moisture ◽  
Conceptual Model ◽  
Unsaturated Zone ◽  
Soil Surface ◽  
Frozen Soil ◽  
Freezing And Thawing ◽  
Moisture Movement ◽  
Freeze Thaw ◽  
Surface Evaporation ◽  
Thawing Process

Conceptual model is considered as one of the crucial and essential methods for scientific research on cold region hydrology. However, graphical conceptual model that integrates with a variety of influencing factors and specializes in describing soil moisture dynamic in seasonal frozen unsaturated zone has never occurred in any related researches, due to which the study on mechanism of frozen soil moisture movement has been delayed in a certain degree. Firstly, three stages of freezing and thawing process are divided in this article to serve for the further study in seasonal frozen unsaturated zone, which respectively are: the Stage of Freezing (Instable Freezing Stage and Stable Freezing Stage), the Stage of Thawing (Instable Thawing Stage and Stable Thawing Stage) and the Stage of Freeze-free. Secondly, based on different stages above, three characteristics and the relationships are analyzed, which include freeze-thaw-action and groundwater table, freeze-thaw-action and groundwater storage, freeze-thaw-action and soil surface evaporation. Thirdly, referred to related theories (Frozen Soil Hydrology and Snow & Ice Hydrology) and the construction of watershed model in warm regions, a whole set of graphical conceptual model and corresponding symbolic model have been built with freezing and thawing process as x-axis (time coordinate) and both soil frozen depth and different parameters as double y-axis. The different parameters include groundwater depth, soil water moisture rate and soil surface evaporation intensity. The graphical and symbolic conceptual models comprehensively describe the entire process and the factors relationships of soil moisture movement in seasonal frozen unsaturated zone. These models are expected to provide scientific basis for practical work in cold areas, such as hydrologic and hydraulic calculation in cold seasons, assessment and utilization of frozen area water resources and agricultural irrigation in cold regions, and also to provide references to the development of mathematical or experimental models in related researching fields.

scholarly journals Influence of the vadose zone on groundwater pollution - A review

2019 ◽  
Vol 1 (1) ◽  
pp. 41-44
Author(s):  
Banajarani Panda ◽  
Chidambaram S
Keyword(s):  
Soil Properties ◽  
Water Content ◽  
Water Table ◽  
Vadose Zone ◽  
Groundwater Pollution ◽  
Land Surface ◽  
Unsaturated Zone ◽  
Water Movement ◽  
Ground Surface ◽  
Fluid Distribution

The vadose zone is the geologic profile that lies between the water table and the ground surface. It has low water content relative to the saturated zone and commonly referred as the unsaturated zone. Recharge to the water table passes through the vadose zone and understanding transport through this region is critical in groundwater pollution studies. Groundwater pollution is controlled by a number of physical and chemical processes which may retard or transform contaminants as they pass through the vadose zone.  Porous materials hold water under tension as a component of soil structure, ambient fluid pressures and other factors. When vadose zone water content is below saturation, leakage liquid as well as the dissolved materials passed on in it are retained. Hydrologically, the depth of unsaturated zone plays an important role in controlling water movement and contaminant transport from the land surface to the aquifer. The purpose of this study is to present an overview of the principles of fluid flow and moisture retention in the vadose zone and its influence on groundwater pollution. The study is presented in two parts: Part I includes descriptions of zones of soil moisture, basic principles of properties controlling the fluid distribution in pore spaces and how subsurface soil properties can be used to assess the leachate mobility. Part II review the principle of fluid movement in the vadose zone and impact of seepage on groundwater pollution. This study will focus on how vadose zone conditions and soil properties act to control groundwater pollution.

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