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İstanbul Teknik Üniversitesi (2017)

Hydrogeological investigation of Hasanlar dam basin

AMIROV Fikrat

Titre : Hydrogeological investigation of Hasanlar dam basin

Hasanlar barajı havzasının hidrojeoloji incelemesi

Auteur : AMIROV Fikrat

Université de soutenance : İstanbul Teknik Üniversitesi

Grade : Master 2017

Résumé partiel
In this Graduate Degree thesis study it is aimed to investigate the geological, hydrological and hydrogeological properties of the Hasanlar Dam Basin and its close surrounding within the scope of the Geological Engineering program of Istanbul Technical University, Institute of Science, Technology and Engineering. The area of investigation is within the boundaries of the Yığılca district of Düzce province, located in the Western Black Sea region. To be more specific the study area is in frontiers of the F 26 C3, F 26 C4 ; F 27 D3 ; G 26 A1, G 26 A2, G 26 A3, G 26 A4 ; G 26 B1, G 26 B2, G 26 B3, G 26 B4 ; G 27 B2 and G 27 D4 1/ 25.000 scale topographic maps. During the field investigations coordinates, strike and dip of the layers measured by instruments (Brunton geological compass, Etrex gps etc.). The Geological map of 1/ 25.000 scale revised with the field studies. The data obtained from previous studies were also taken into consideration in terms of clarification of formation boundaries. Subsequently geological cross sections were prepared. The Hasanlar dam basin is located within western Pontid zone. The Yedigöller Formation underlying at the bottom is mainly consist of metavolcanite, metagranitoid, migmatite, amphibolite, gneiss, marble and schist age of Precambrian. The Lower Ordovician aged Kurtköy Formation, consisting of sandstone, mudstone and conglomerate comes with angular unconformity over the Yedigöller Formation. The Ereğli Formation, transitional with Kurtköy Formation from bottom and Yılanlı Formation from top is consist of consecutive sandstone, shale and limestone units. The Yılanlı Formation, composed of limestone, dolomitic limestone and dolomites is of Middle-Upper Devonian-Lower Carboniferous age. Triassic-Permian aged Çakraz Formation comes with angular unconformity over the Yılanlı Formation, is composed of sandstone, mudstone and conglomerates. Consisting of Cretaceous aged units such as conglomerate, sandstone, siltstone, marl, limestone, marble, granite, gabbro and serpentinite Abant and Akveren Formations demonstrates angular unconformity each other. The Yığılca Formation formed from aglomerate, basalt and different volcanic origin rocks during volcanic activities in the Eocene period is transitional with Çaycuma Formation consisting of limestone, tuffite, marl-level sandstone, siltstone and claystone units. Quaternary aged units are slope rubble and alluvium. They are formed as a result of erosion and transportation of river sediments. Trustworthy and regular measured data’s gathered from the State Meteorological Stations in the study area were evaluated for the groundwater budget estimations of Hasanlar Dam Basin. Arid and rainy periods of the region determined by the average precipitation and deviation rates. Syn-precipitation curves plotted with ArcGIS software used to calculate total and average precipitation rates for Hasanlar Dam Basin. Moreover, the same curve method applied to estimate total and average real evapotranspiration rates which previously gathered from 5 different State Meteorological Stations and calculated by PENMAN method. Subsequently, flow rate obtained from difference of precipitation and real evapotranspiration compared with ratio compiled from Flow Observation Stations. Total recharge and discharge rates acquired due to mentioned calculations. Structural and hydrogeological features of the lithological units in the study area are evaluated and classified according to possessiveness and transmission characteristics of groundwaters. Unconsolidated Formations (wide-rich aquifers, regional unallied-local aquifers) and Consolidated Formations (wide-rich aquifers, regional-unallied local aquifers, poor aquifers, very poor aquifer).

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