中文摘要：

定量构造地貌研究有助于理解构造与地表过程之间的耦合关系及其对地形地貌发育的影响,数字高程模型（DEM）和地理信息系统（GIS）空间分析技术的结合为开展这方面的研究提供了新途径.利用这一方法,对北天山乌鲁木齐河流域进行地貌计量指标的综合分析.构造上,乌鲁木齐河流域分为山前坳陷区、南山隆起带、后峡断陷带以及天山主脉等构造分区.本文首先分析了DEM数据精度、流域面积与空间分布特征对面积-高程积分的潜在影响,根据分析结果,选择合适的面积阈值对乌鲁木齐河流域开展面积-高程积分分析,进一步结合高程频率分布特征探讨该流域地形地貌演化特征.结果表明,1）面积-高程积分受DEM数据精度的影响不显著,但其具有明显的流域面积和空间依赖性;2）基于面积-高程积分分析,乌鲁木齐河流域各构造分区的地貌演化阶段存在差异,除后峡断陷带地貌演化趋于老年阶段外,其余均处于壮年演化阶段;3）各构造分区平均高程频率分布状态表明,山前坳陷区、南山隆起带和天山主脉地形目前均处于前均衡—均衡状态演化阶段,后峡断陷带地形则为后均衡演化阶段.

英文摘要：

Quantitative tectonic geomorphology study is helpful to understanding of the coupling relationship between tectonic and surface processes and its impacts on topographic evolution. GIS spatial analysis on digital elevation model （DEM） has been successfully applied to reveal these effects by quantitatively extracting geomorphic indices such as hypsometric integral （HI） and to further understand the landform evolution of some specific regions. Here we use HI as well as hypsometric curves （HC） to reveal the landform evolution of the Urumq River drainage basin in the northern Tianshan Mountains range, Northwestern China. Tectonically and geomorphologically, the Uriimqi River drainage basin can be divided into four subzones, i.e. Tianshan uplift zone, Houxia graben, Nanshan uplift zone and piedmont depression, which are characterized by significantly different lithology and surface processes from each other. Our analysis of HI and HC is performed on each zone of the Urumq River drainage basin. We first analyzed the possible effects on HI of the resolution of DEM data and the attributes （such as the area, lithology and tectonism） of sub-basins. Based on these analyses, we then chose 9km2 as the suitable area threshold of the sub- basin to perform the HI analysis. Together with the elevation distribution, we characterized the topographic evolution of the Urumqi River drainage basin and its four tectonic subzones. Our results show that, （1） The DEM resolution insignificantly affects the HI, while this geomorphologic index displays an obvious scale-spatial dependency. （2） The landform evolution of the Llriimqi River drainage basin is defined by both HI and HC at the stage of maturity （ HI = 0. 4882 with the S-shaped HC）, and the four tectonic subzones of the drainage basin are defined at different stages of landform evolution by these two geomorphologic indices, with Houxia graben at topographic old age （HI〈0.4） and the three other subzones at the stage of topographic maturity （HI〉0.4?