Determination of geostatistically representative sampling locations in Porsuk Dam Reservoir Turkey

Aksoy, Ayşegül
Düzgün, Hafize Şebnem
Several factors such as wind action, bathymetry and shape of a lake/reservoir, inflows, outflows, point and diffuse pollution sources result in spatial and temporal variations in water quality of lakes and reservoirs. The guides by the United Nations Environment Programme and the World Health Organization to design and implement water quality monitoring programs suggest that even a single monitoring station near the center or at the deepest part of a lake will be sufficient to observe long-term trends if there is good horizontal mixing. In stratified water bodies, several samples can be required. According to the guide of sampling and analysis under the Turkish Water Pollution Control Regulation, a minimum of five sampling locations should be employed to characterize the water quality in a reservoir or a lake. The European Union Water Framework Directive (2000/60/EC) states to select a sufficient number of monitoring sites to assess the magnitude and impact of point and diffuse sources and hydromorphological pressures in designing a monitoring program. Although existing regulations and guidelines include frameworks for the determination of sampling locations in surface waters, most of them do not specify a procedure in establishment of monitoring aims with representative sampling locations in lakes and reservoirs. In this study, geostatistical tools are used to determine the representative sampling locations in the Porsuk Dam Reservoir (PDR). Kernel density estimation and kriging were used in combination to select the representative sampling locations. Dissolved oxygen and specific conductivity were measured at 81 points. Sixteen of them were used for validation. In selection of the representative sampling locations, care was given to keep similar spatial structure in distributions of measured parameters. A procedure was proposed for that purpose. Results indicated that spatial structure was lost under 30 sampling points. This was as a result of varying water quality in the reservoir due to inflows, point and diffuse inputs, and reservoir hydromorphology. Moreover, hot spots were determined based on kriging and standard error maps. Locations of minimum number of sampling points that represent the actual spatial structure of DO distribution in the Porsuk Dam Reservoir
AGU 46th Annual Fall Meeting, (9 - 13 Eylül 2013)


Determination of optimum rack angle of tyrolean type water-intake structures
Melek, Abiddin Berhan; Göğüş, Mustafa; Department of Civil Engineering (2017)
Tyrolean weir is known as an effective device to separate major part of sediment from the main channel flow in order to provide required sediment-free water discharge for run-off river hydropower plants. Basically, in the design of Tyrolean weirs, the main concern is to divert at least the design discharge of the facility while it permits to enter the minimum amount of bed-sediment to the system. In this study, water and sediment capture rates of Tyrolean type water-intake structures were investigated for a...
Assessment of the effects of multiple extreme floods on flow and transport processes under competing flood protection and environmental management strategies
Tu, Tongbi; Carr, Kara J.; Ercan, Ali; Trinh, Toan; Kavvas, M. Levent; Nosacka, John (2017-12-01)
Extreme floods are regarded as one of the most catastrophic natural hazards and can result in significant morphological changes induced by pronounced sediment erosion and deposition processes over the landscape. However, the effects of extreme floods of different return intervals on the floodplain and river channelmorphological evolution with the associated sediment transport processes are not well explored. Furthermore, different basin management action plans, such as engineering structure modifications, m...
Obtaining soil-water characteristic curves by numerical modeling of drainage in particulate media /
Shoarian Sattari, Amir; Toker, Nabi Kartal; Department of Civil Engineering (2014)
The soil water characteristic curve (SWCC) reflects fundamental drainage properties of partially saturated soils by revealing the relation between soil suction and water content. Although during the past decades, various experimental methods have been proposed for obtaining the SWCC, these approaches are generally time consuming, expensive and highly dependent on operator skills. One solution to this has been sought through various empirical or physico-empirical formulations that link the SWCC to common soi...
Assessment of seawater intrusion in a coastal aquifer by using correlation, principal component, and factor analyses
Karahanoğlu, Nurkan (Wiley, 1997-05-01)
Hydrogeochemical characterization of the Erzin Plain coastal aquifer has been accomplished in this research to investigate the spatial and transient behavior of its water quality. The aquifer is located along the Mediterranean coast and forms one of the most productive aquifers in Turkey. Chemical analyses of groundwater samples collected from the aquifer during 1964-1968 (128 samples), May 1993 (30 samples), October 1993 (37 samples), and June 1994 (20 samples) constitute the available groundwater quality ...
Investigation of Sea Surface Temperature (SST) Anomalies over Cyprus Area
Georgiou, Andreas; Akcit, Nuhcan (2016-04-08)
The temperature of the sea surface has been identified as an important parameter of the natural environment, governing processes that occur in the upper ocean. This paper focuses on the analysis of the Sea Surface Temperature (SST) anomalies at the greater area of Cyprus. For that, SST data derived from MODerate-resolution Imaging Spectroradiometer (MODIS) instrument on board both Aqua and Terra sun synchronous satellites were used. A four year period was chosen as a first approach to address and describe t...
Citation Formats
A. Aksoy and H. Ş. Düzgün, “Determination of geostatistically representative sampling locations in Porsuk Dam Reservoir Turkey,” presented at the AGU 46th Annual Fall Meeting, (9 - 13 Eylül 2013), San-Francisco, Amerika Birleşik Devletleri, 2013, Accessed: 00, 2021. [Online]. Available: