| Author | Deb, Sanjit Kumar |
| Call Number | AIT Thesis no.WM-99-18 |
| Subject(s) | Soil erosion prediction--Simulation methods
|
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of
Engineering. |
| Publisher | Asian Institute of Technology |
| Abstract | Rising concerns regarding agricultural non-point sources pollution have promoted
mathematical computer models for examining and evaluating the nature and extent of such
effect. In this study GLEAMS model is tested to evaluate model's applicability in simulating
soil loss and nutrient export from agricultural land on hydrologic, physiographic, and
management conditions of the Rayong watershed. Model calibration and validation are carried
out such that each of the three submodels is tested based on qualitative and quantitative
assessment for the selected events with considerable lumping of inputs. Sensitivity analyses
are performed to quantify site-specific model parameters and relative model responses.
Compared to conventional agronomic practices, relative effectiveness of several BMPs is
evaluated on an event basis.
Results indicate that GLEAMS is capable of producing reasonable prediction of soil
loss, runoff N and P nutrient losses, and their concentrations below the crop root zone within
the agreed variability of field data. The erosion and nutrient submodels are somewhat erratic
but within acceptable limits, yielding good prediction on certain events and only fair on other
events. Model prediction from all plots is reasonably well with observed data in comparing the
impact of alternate BMPs on soil and nutrient losses reduction. Of all BMPs, combinations of
intercropping and contour plowing seem to be most effective in reducing soil and runoff
nutrient losses, while no-till reduces nutrient concentrations below the crop root zone.
Direction and depth of tillage may have significant influence on BMPs plots of the study area. |
| Year | 2000 |
| Type | Thesis |
| School | School of Engineering and Technology (SET) |
| Department | Department of Civil and Infrastucture Engineering (DCIE) |
| Academic Program/FoS | Water Engineering and Management (WM) |
| Chairperson(s) | Loof, Rainer;Gupta, Ashim Das ; |
| Examination Committee(s) | Babel,M. S.;Izumi, Norihiro ; |
| Scholarship Donor(s) | The German Academic Exchange Service;(DAAD); |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 2000 |