Batman Universitesi Yasam Bilimleri Dergisi
Cilt 1, Sayı 2  Ocak-Haziran 2012  (ISSN: 2147-4877, E-ISSN: 2459-0614)
Ali Bilgin, Sönmez Arslan, Yeliz Şenay, Süleyman Polat

NO Makale Adı
1356036772 Rock-Decomposition in Hasankeyf District and Its Effect on Residential Area

This paper discusses weathering of limestone exposed around Hasankeyf
and the factors worsening of natural stones which are used as construction materials
in older historical buildings. When the limestone exposed to the atmosphere rocks
slowly break down. These breaking down termed as weathering is occasionally
by contact of the limestone with water, air and organisms. Rocks expands when
heated and contracts when cooled result in physical weathering by breaking down
without changing their chemical composition. Rainfall is acidic because atmospheric
CO2 dissolves in the rainwater producing weak carbonic acid. This acid reacts with
calcium carbonates (limestone) and forms calcium bicarbonate. This process speeds
up with decrease in temperature, since colder water holds more CO2 gas producing
H2CO3dissolves limestone and produce Ca(HCO3)2. Carbonationon the surface of
well jointed limestone of Hasankeyf produces weathering along the joints lithologies
and historical works around the Hasankeyf have been adversely affected by tectonic
activities and meteoric waters result in rock falling and rock decompositions. In this
study, the detailed information on rock decomposition based on causes and reasons
are being given. Hasankeyf location is divided by young and deep valleys with respect
to geomorphologic position. The HasankeyfValley hillsides are more likely steep in
terms of topographic position. The massive looking limestone which form both sides
of the valley are tick-layers and weak with respect to hardening and unstable to rockfalling.
With respect to climate, Hasankeyf is cool and rainy in winter and hot and
arid in summer. Mediterranean type of climate takes place Hasankeyf district. As a
result, the vital measures are being mentioned on conservation of caves, historical
remnants, physical and chemical decomposition effects upon these remnants and the
caves are being discussed in detail.