ASSESMENT OF BATHYMETRIC MAPS VIA GIS FOR WATER IN RESERVOIR

Abstract

In order to adopt measures for storing more water in reservoirs, lakes and ponds; to
prevent water pollution, protect water sources and extend the service life of these
facilities, it is important for manager (Municipalities, Directorates of the State
Hydraulic Works (DSHW), Irrigation Unions etc.) to know the current topographic
conditions and any changes in the storage capacities of these facilities. This study
aimed to identify the updated topographic and bathymetric data required for the
efficient management and usage of Altınapa reservoir, changes in surface area and
volume of the facility, and to form a Reservoir Information System (RIS). Two
digital elevation models, from 2009 and 1984, were used to determine changes in
the storage capacity of the reservoir. The calculations indicated that, within this 25-
year period, the storage capacity of the reservoir decreased by 12.7% due to
sedimentation. A Dam Information System (RIS) was developed from a wide range
of data sources, including topographic and bathymetric data of the reservoir and its
surrounding area, data on specific features such as plant cover, water quality
characteristics (Temperature, Dissolved Oxygen (DO), Secchi Disk Depth (SDD)
and pH), geological structure, average water level, water supplied from springs,
evaporation value of the reservoir, and precipitation.