Development and morphometry of drainage network in volcanic terrain, Central Anatolia, Turkey

Autor: Bekir Necati Altın, Türkan Bayer Altın
Přispěvatelé: ANIKUZHIYIL, ANISH -- 0000-0001-9686-1283, [Altin, Turkan Bayer -- Altin, Bekir Necati] Nigde Univ, Fac Educ, Dept Primary Sch Teaching, Nigde, Turkey, 0-Belirlenecek
Rok vydání: 2011
Předmět:
Zdroj: Geomorphology. 125:485-503
ISSN: 0169-555X
DOI: 10.1016/j.geomorph.2010.09.023
Popis: WOS: 000286564800003
This paper presents the results of morphotectonic and morphometric research carried out in order to determine the neotectonic development of the volcanic mountains and a drainage network in SW Cappadocia. The study area extends among the Aksaray, Nigde, and Nevsehir Provinces. The study area comprises Hasandag, Melendiz, Keciboyduran, Golludag Mountains and the adjacent parts of these volcanic mountains. Data collected exclusively from 1:25,000 digitised topographic maps and 10 m-resolution DEMs were used to define parameters related to the longitudinal profile of streams. The study area was divided into 10 volcanic units. Longitudinal profiles of 20 streams and stream orders were analysed to determine a regional tectonic differentiation pattern in these units. The streams in the study area drain into four different tectonic depressions. These depressions are Aksaray plain controlled by the Tuz Golu fault (TCF), Ciftlik plain controlled by the Keciboyduran Melendiz fault (KMF), Misli plain controlled by the Derinkuyu fault (DF), and Bor plain controlled by the Nigde Fault Zone (NFZ). An analysis of morphometric parameters shows that the development of a drainage network is associated with faults and rock resistance. Occurrence of morphometric parameters with different values in units reveals that the volcanic mountains were not uplifted in the same period and were subjected to different morphologic processes. High total order number in the south of Hasandag (unit 3) and Melendiz Mountains (unit 7) indicate that the uplift ratio of the southern part is much greater than that of the northern part. Moreover, development of the drainage network in the south is in a more advanced phase than in the north. Indeed, the drainage network in the north is in the youngest erosional phase of all parts of the study area. The increased stream length-gradient indices (SL), and stream gradients and an analysis of headward erosion show that the streams displaying the longest and highest reach of the erosional phase are all in the southern part of Keciboyduran and Melendiz Mountains. The longitudinal profile (Lp) of the present thalweg of the streams is irregular. The irregular Lp are associated with four different causes. These are geological variations in resistance, tectonics, and volcanic topography and downcutting in response to stream incision. The beginning of the fluvial incision in the northern part is younger than in the south. Crown Copyright (C) 2010 Published by Elsevier B.V. All rights reserved.
Databáze: OpenAIRE
Externí odkaz: