Environmental assessment of Karachi Harbor area and Lyari River | |
| Author | Sadaf, Uzma |
| Call Number | AIT Thesis no.WA-94-8 |
| Subject(s) | Environmental impact analysis--Pakistan--Lyari River Environmental impact analysis--Pakistan--Karachi Harbor |
| Note | A Thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Civil Engineering |
| Publisher | Asian Institute of Technology |
| Abstract | Inadequately treated wastewater disposal into the Lyari channel impairs the environment not only along the channel but also at its outfall in the harbor basin. This study is conducted to evaluate the existing conditions in the channel-harbor basin system, and to assess the impacts borne by the former on the later. It was sought to use MIKE 11 model to simulate the existing pollution pattern in the channel for determination of abatement in the pollution level by imposition of effluent quality criteria and provision of appropriate treatment techniques. The existing conditions in the channel were analyzed and zones of various degrees of pollution were delineated using cluster analysis. Spatial variation of various parameters in the harbor basin was used to assess the impact of L yari outfall in the area. Trend of pollution loading in the harbor basin was also ascertained using data over a period of 10 years. Hydrodynamic simulations were realistic but the failure of Transport Dispersion Model suggests that a more detailed Water Quality Model of MIKEl 1 should be applied for modelling . of water with high BOD concentrations. Evaluation of the existing conditions shows that the most polluted stretches of the channel are in the upstream reach and again in the middle reach, both of which receive wastewater from the predominantly industrial areas. It is inferred from the characteristics of the wastewater that primary sedimentation and simple biological techniques would be. appropriate to circumscribe the contamination levels within the allowable limits. The difference between the properties of water samples at the Lyari outfall and those of the other stations in the harbor basin was found to be pronounced which implies that there is a lack of proper flushing due to tidal action, which results in containment of the input in the area near the outfall. It can be summed up that although there is an unchecked wastewater input in the harbor basin, yet the highly buffered receiving system is sustaining the load. Recommendations are made to study the problem with more detailed spatial and temporal data which would help to assess the extent of long term impacts of the contaminants explicitly. |
| Year | 1994 |
| Type | Thesis |
| School | School of Civil Engineering |
| Department | Other Field of Studies (No Department) |
| Academic Program/FoS | Water Resources Research Engineering (WA) |
| Chairperson(s) | Liang, Sherng |
| Examination Committee(s) | Suphat Vongvisessomja ;Kaew Nualchawee ;Uruya Weesakul ;Ammentorp, Hans Christian |
| Scholarship Donor(s) | NORAD |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1994 |