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    Geotechnical considerations for coastal reservoirs
    (Elsevier, 2020) Sitharam, T.G.; Kolathayar, S.
    Geotechnology and geotechnical schemes have a significant role to play in conserving the water. This chapter highlights the importance of geotechnology in surface and subsurface water storage and in coastal reservoirs. Groundwater hydrology, soil/rock characteristics and permeability are the major factors governing the efficiency of water storage techniques in the ground. The innovative materials for construction of water storage schemes in the ground and for lining are briefly discussed. The chapter further discusses the concept of the subsurface dike or underground dams and its applicability in storing a large amount of water underground and in check seawater intrusion. The role of geotechnology in construction and maintenance of coastal reservoirs is discussed in detail. Different dike construction methods are discussed considering recent developments on techniques and materials. The major geotechnical components in the design and construction of coastal reservoirs are the stability of sea dike and settlement of the soil below the dike. The geotechnical parameters and the concepts of checking the stability factor of safety and settlement calculations are presented in this chapter. The coastal reservoirs must be safe against earthquakes, and deterministic estimation of seismic hazard is introduced briefly at the end. © 2020 Elsevier Inc.
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    Stability Analysis of Emerged Seaside Perforated Quarter Circle Breakwater Using Soft Computing Techniques
    (Springer Science and Business Media Deutschland GmbH, 2022) Madhusoodhanan, S.; Rao, S.
    Breakwaters are constructed to address a variety of coastal requirements ranging from maintaining tranquility conditions for a port or harbor area to prevent coastal recession. Quarter circle breakwater (QCB) is a composite structure, with a rubble mound foundation and a super structure comprising of a quarter circular surface facing incident waves resting on a horizontal bottom with a rear vertical wall alongside. Be it any structure, it is essential that the design is economic, safe, and functional. Thus, the accurate estimation of minimum (critical) weight of the super structure required to oppose the sliding is vital. Also, physical model studies can be laborious and time-consuming, whereas numerical modeling can be complex. Therefore, under such circumstances, soft computing techniques prove to be handy if sufficient data are available. In this study, W/γHi 2 of an emerged seaside perforated QCB for varying S/D ratios is estimated using ANN, SVM, and AdaBoost models. Hi/gT2, d/hs, and p (%) are chosen as input parameters with the W/γHi 2 as the output parameter. Further, the obtained results are compared using performance indicators such as RMSE, R2, and MAE following which the best model is selected. The data that are used for the present study is collected from the laboratory investigation conducted in the Wave Mechanics Laboratory of the Department of Water Resources and Ocean Engineering, National Institute of Technology Karnataka, Surathkal. © 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.