A screening model for the assessment of leachate collection efficiency and groundwater pollution potential at landfill sites

Aksakal, Sultan
Ünlü, Kahraman


Ünlü, Kahraman; PARKER, JC; STEVENS, D; CHONG, PK; KAMIL, I (Elsevier BV, 1992-10-01)
This paper describes a screening model for evaluating the migration of organic and inorganic contaminants leached from land-disposed wastes. The model is composed of a waste-zone release submodel, an unsaturated-zone transport submodel and a saturated-zone transport submodel. The waste-zone submodel assumes steady one-dimensional vertical flow through a uniform waste zone treated as a "stirred tank reactor". Soluble inorganic contaminants are assumed to exhibit a constant concentration in the leachate until...
A Quantitative Approach for Rapid Seismic Vulnerability Assessment of Steel Highway Bridges
Dicleli, Murat (1997-01-01)
While methodologies exist which allow to rapidly identify the seismically deficient bridges and rank them in terms of their respective vulnerability, it remains that the bridge vulnerability aspect of these methodologies is crude and generally limited to simple recognition of undesirable structural features known to have performed inadequately in past earthquakes. Thus, bridges sharing such features would also share the same rating, independently of variations in geometry and other structural properties. As...
A data-driven approach for predicting nepheline crystallization in high-level waste glasses
Sargın, Irmak; Lonergan, Charmayne E.; Vienna, John D.; McCloy, John S.; Beckman, Scott P. (2020-09-01)
High-level waste (HLW) glasses with high alumina content are prone to nepheline crystallization during the slow canister cooling that is experienced during large-scale production. Because of its detrimental effects on glass durability, nepheline (NaAlSiO4) precipitation must be avoided; however, developing robust, predictive models for nepheline crystallization behavior in compositionally complex HLW glasses is difficult. Using overly conservative constraints to predict nepheline formation can limit the was...
A Methodology for real-time sensor-based blockage assessment of building structures during earthquakes
Ergin, Tuluhan; Erberik, Murat Altuğ; Kurç, Özgür; Department of Civil Engineering (2013)
During and after earthquakes, occupants inside a damaged building should be evacuated rapidly and safely whereas related units outside the buildings (e.g. first responders) should know the current condition of the building. Obviously, this information should be as accurate as possible and accessed timely in order to speed up the evacuation. Unfortunately, absence of such information during evacuation and emergency response operations results in increased number of casualties. Hence, there arises a need for ...
A model for optimal operation of land-treatment sites for oily wastes
Ünlü, Kahraman (SAGE Publications, 2001-06-01)
Land treatment as a disposal technology has been extensively used for the disposal of oily wastes. Effective management of land treatment sites require optimal operation of the system in order to achieve the fastest and most complete degradation of petroleum hydrocarbons without contamination of the environment. This paper describes a model that can be used for optimising the operation of land treatment sites for oily wastes. The model is composed of system simulator and optimisation submodels. Conceptually...
Citation Formats
S. Aksakal and K. Ünlü, A screening model for the assessment of leachate collection efficiency and groundwater pollution potential at landfill sites. 1995, p. 490.