| Author | Babel, Mukand Singh |
| Call Number | AIT Thesis no. AE-83-02 |
| Subject(s) | Soils--Leaching--Mathematical models
|
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Environment, Resources and Development |
| Publisher | Asian Institute of Technology |
| Abstract | Effect of leaching method (Ponding or Sprinkling) on salt displacement was studied in laboratory soil columns. The salt-mixed soil was packed in columns to an average bulk density of 1.43 g cm-3. Water was applied by keeping a thin
layer (1 cm) over the soil surface (ponding) and at the rates of 1.44 cm hr-1 and 0.54 cm hr-1 (sprinkling). Water and salt profiles were determined by
destructive sampling in 2 cm depth intervals when water front had reached a
depth of 20, 40 or 60 cm. The comparison showed that sprinkling is more efficient in leaching the salt compared to ponding. A saving in water of about 35% was observed with high rate sprinkling compared to ponding to achieve same
degree of leaching. On the other hand, high rate sprinkling required ten times more time than ponding. The dynamic simulation language (CSMP III) was used to develop a computer
model to simulate the water and salt movement in transient unsaturated flow conditions. The partial differential equations describing the salt and water movement were approximated by dividing the soil into a number of layers of equal
thickness .
To obtain input parameters, soil moisture characteristic curve and hydraulic diffusivity-water content function, experiments were conducted in laboratory .
The model performance was tested by comparing the simulated results with the
results obtained from the leaching experiments. The model gave satisfactory results for water movement. |
| Year | 1983 |
| Type | Thesis |
| School | School of Environment, Resources, and Development |
| Department | Department of Food, Agriculture and Natural Resources (Former title: Department of Food Agriculture, and BioResources (DFAB)) |
| Academic Program/FoS | Agricultural and Food Engineering (AE) |
| Chairperson(s) | Jensen, Jens Raunso |
| Examination Committee(s) | Gupta, Ashim Das ; Rahman, Md. Ataur |
| Scholarship Donor(s) | Government of Japan |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1983 |