Lakshminath Bezbaroa Central Library Digital Repository

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Now showing 1 - 5 of 26

Recent Submissions

Modelling the Effect of Land use Land cover changes on groundwater recharge
(2022)
Devi, Ande Bhuvaneswari
Groundwater is the world's largest available freshwater resource. More than half of the world’s population depends on this resource for domestic supply. A global assessment on groundwater resources indicates a constant decline in water storage among principal aquifers. Aquifer recharge is complex, influenced by climate conditions; land use and land cover (LULC) dynamics; aquifer lithology, and topography. Climate and LULC have significant effect on the recharge process due to their direct impact on soil infiltration. Urbanisation-induced LULC changes lead to the rise in impervious surface coverage, causing a decrease in infiltration and a significant decline in groundwater recharge rates. However, due to the complex nature of groundwater recharge and lack of databases, studies on the effects of LULC and climate on the groundwater recharge is minimal. Therefore, this study is aimed at the effects of LULC and climate on the groundwater recharge process for a coastal urban shallow aquifer of Cochin, Kerala, India. The study was accomplished in two parts, with the first part based on direct observations from the study area aided by satellite datasets and secondary datasets. The second part is on forecasting future scenarios, based on modelling. A series of LANDSAT satellite data sets were used to analyse the historical LULC dynamics of Cochin from 1994 to 2020. The analysis indicates that the rapid urbanisation and other anthropogenic activities have adversely affected all major natural land cover classes for the past three decades. To understand the changes in groundwater potential zones due to the changing LULC, a multi-criteria decision analysis (MCDA) approach was adopted in a GIS platform. Historical groundwater potential index maps (GWPI) were derived using six geo-environmental factors by keeping all other factors static with changing LULC. Change detection analysis was performed on the historical GWPI to derive groundwater potential change index (GWPCI). The study reveals the impact of the LULC dynamics on groundwater potential.
Seismic Behavior of Assam-type Wooden Houses
(2021)
Chand, Biswajit
Traditional Assam-type wooden houses are popular housing systems in the seismically active north-eastern Himalayan region of India. These have performed exceptionally well during the past several earthquakes on contrary to RC structures. Apart from its high seismic resilience, the housing system has a number of features that are uniquely different from other traditional wooden houses, e.g., its construction methodology, timber framing system, special type of connection between framing members, light-weight walls and roof, and good wall-to-frame connections that contribute to their earthquake safety. In spite of having excellent earthquake-resistant features, the Assam-type houses have not received due attention and seismic performance has not been studied so far. Therefore, a maiden attempt has been made to evaluate the seismic behavior of Assam-type houses scientifically. To evaluate the seismic behavior, full-scale frames of a single-story Assam-type house were tested under quasi-static cyclic and monotonic lateral loads. The influence of timber framing members, connections, openings (window, door) and infills (Ikra panels) of the frame specimens was studied to get deeper insights into the lateral-load behavior. Results showed excellent behavior in terms of high lateral drift and ductility capacity without any significant drop in the lateral strength. The physical and mechanical properties of materials used in timber framing and infill (Ikra) panels of the house were experimentally evaluated under relevant loading conditions to scientifically study their behavior and understand their contribution in the global lateral load carrying capacity of Assam-type houses. The behavior of seven different connections generally provided in Assam-type houses were also evaluated under relevant loading conditions to assess the performance and contribution of the different connections on the overall lateral load behavior. The primary connections of the timber frame hardly suffered any significant damage under the lateral loading, and the performance was found to be much superior compared to the behavior of connections in other vernacular houses. Experimental results were used to develop to the simplified (macro) as well as detailed (micro) finite element models to predict the lateral load behavior of frames of Assam-type houses. While the macro modelling was found to be very effective in estimating the lateral strength of the frames, the micro modelling was found to satisfactorily simulate even the damage accumulated in different members. Further, to ascertain their seismic behavior, the dynamic behavior of traditional Assam-type houses was evaluated on full-scale single-storey 3D house specimen using a large number of recorded and synthetic ground motions with increasing PGA amplitude under shake table tests. The specimen exhibited excellent behavior without any significant damage even under extreme level of shaking. Since the house specimen did not suffer significant damage under dynamic loads, a quasi-static test was carried out on the same house specimen after the shake table test to evaluate its lateral load carrying capacity. The experimental results showed very high deformability and ductility capacity of the house. Results obtained in the experimental study were finally used to develop an empirical regression model for estimation of the lateral strength of Assam-type housing frame and the entire house. Finally, construction guidelines for Assam-type houses were made to further improve the seismic performance. The extensive experimental study on Assam-type wooden housing can be used to scientifically convince the local people, who have started constructing reinforced concrete buildings without fully understanding their construction and design aspects, to again adopt the practice of construction of such houses. This, in turn, may reduce the seismic risk in the region by controlling the construction of informally constructed reinforced concrete buildings.
Investigation on the Use of Various Industrial Waste Materials as a Sustainable Geopolymer Binder for Pavement Application
(2026)
Bijalwan, Alok
UNDER EMBARGO
An Investigation of the Anti-cancer Activity and Mechanistic Insights of the Supramolecular Nanobots
(2026)
Dey, Parama
UNDER EMBARGO
Designing and Evaluating Illumination Fidelity in Immersive Virtual Environments for Task-Based Behavioral Studies
(2026)
Kumar, Rohit
UNDER EMBARGO