Presentation 3.pptxfor soil science students

It includes soil science data (Soil Physics)

1. EXTENDED DARCY'S LAW AND ITS APPLICATIONS.

2. Introduction ​ 2

3. Darcy's Laws A mathematical equation describing the flow of fluids through porous media, such as soil. It states that the flow rate (Q) is proportional to the hydraulic gradient (dh/dL) and the hydraulic conductivity (K) of the soil.  E 3

4. Hydraulic Conductivity (K):   A measure of the soil's ability to conduct water. It depends on soil properties like texture, structure, and water content.  E 4

5. The change in hydraulic head (water pressure) over a given distance (L).  4. Extended Darcy's Law: A modified version of Darcy's Law that includes additional terms to account for nonlinear effects, inertial effects, coupling with heat and mass transfer, and heterogeneous soil properties.  5. Nonlinear Effects:  Phenomena that cannot be described by a linear relationship between flow rate and hydraulic gradient, such as soil water hysteresis (different water retention curves for wetting and drying).  PRESENTATION TITLE 3. Hydraulic Gradient (dh/dL): 

6.  Predicting water infiltration rates and runoff generation in different soil types and land uses (e.g., agricultural, urban, forest). -         Example: Using Extended Darcy's Law to simulate water infiltration and runoff in a watershed, helping to identify areas prone to erosion and flooding. APPLICATIONS  6 1 . Water Infiltration and Runoff Modeling:

7.   - Modeling the movement and fate of nutrients (e.g., nitrogen, phosphorus) or contaminants (e.g., pesticides, heavy metals) in soil and groundwater. - Examples: - Predicting nutrient leaching and optimizing fertilizer application rates to minimize environmental impact.  APPLICATIONS  7 2. Solute Transport and Fate:

8.   Understanding and predicting soil water evaporation and drying processes, crucial for irrigation management and soil moisture monitoring. -                            Example: Using Extended Darcy's Law to estimate soil evaporation rates and optimize irrigation scheduling for crops like corn or soybeans.  APPLICATIONS  8 3. Soil Evaporation and Drying:

9. Designing and evaluating strategies for cleaning up contaminated soil and groundwater, such as pump-and-treat systems or bioremediation.         Example: Modeling contaminant transport and removal using Extended Darcy's Law to optimize remediation system design and operation.  APPLICATIONS  9 4. Soil Remediation and Contaminant Cleanup:  

10. Optimizing irrigation and drainage systems for efficient water use and reduced environmental impact. -  Examples: - Designing precision irrigation systems for crops like tomatoes or potatoes. - Evaluating the effectiveness of conservation tillage and cover crops in reducing soil erosion and improving water quality.  APPLICATIONS  10 5. Agricultural and Environmental Applications: - 

11. examples of Extended Darcy's Law applications in soil science: -   Water infiltration and runoff modeling - Solute transport and fate (e.g., nutrient leaching, contaminant transport)                                                                         Soil evaporation and drying                                         Soil remediation and contaminant cleanup -   Agricultural and environmental applications           (e.g., irrigation, drainage, soil conservation) 11

12. Thank  you      Presented By: 12 TAHSEEN ASLAM

13. Persented By: 13