ZHANG Yifeng,JIAO Juying,CHEN Yixian,et al.Channel Morphology and Sediment Connectivity of Fangta Wastersed in Ansai County of Northern Shaanxi Province[J].Research of Soil and Water Conservation,2019,26(03):11-15.
陕北安塞坊塌小流域的沟道形态及其泥沙连通性
- Title:
- Channel Morphology and Sediment Connectivity of Fangta Wastersed in Ansai County of Northern Shaanxi Province
- 分类号:
- S157.1
- 摘要:
- 通过对陕北安塞坊塌小流域主沟道及其支流小沟道的研究，旨在探究沟道级别、沟道比降和径流节点特征对泥沙连通性的影响程度，以及泥沙淤地坝对泥沙连通性的作用。采用ArcGIS软件，基于1∶10 000比例尺地形图生成的数字高程模型（DEM），利用水文分析模型提取沟道网络图和沟道坡度图，进而获得沟道级别、沟道比降和径流节点，并结合野外实地调查，记录沟道泥沙潜在连通位置。结果表明：泥沙连通性随着沟道级别的升高而降低；沟道比降随着沟道级别的升高逐级减小，泥沙连通性随着沟道比降的降低也减弱；径流节点数和沟道级别成正相关关系；同时修建的淤地坝对泥沙连通性有着阻碍作用，而且在坝地人工沟渠中泥沙连通性呈弱连通性。研究表明通过沟道形态指标，可以反映出沟道泥沙连通性的变化并实现对泥沙连通性的评价。
- Abstract:
- Study on the main channel and its tributary channel of Fangta watersed in Ansai County of northern Shaanxi, aims at investigating the influences of channel networks, channel levels, runoff nodes and check dams on sediment connectivity. ArcGIS software are used to extract the channel networks, channel level and runoff node based on the digital elevation model derived from topographic maps with the scale of 1:10 000, and the location of sediment connectivity was recorded by combining with the field investigation.The results show that sediment connectivity and channel slope decrease with the increase of channel level, sediment connectivity also decreases with the decrease of channel slope, the feature information index of runoff nodes has the positive correlation with channel level. The channel morphology indexes can reflect the change of channel sediment connectivity and realize the evaluation of sediment connectivity.
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备注/Memo
收稿日期:2018-06-30;改回日期:2018-09-04。
基金项目:国家自然科学基金面上项目“黄土丘陵沟壑区流域泥沙连通性对降雨与人类活动的响应机制”（41771319）
作者简介:张意奉(1992-),女,山西朔州人,硕士研究生,研究方向为土壤侵蚀。E-mail:244175652@qq.com
通讯作者:焦菊英(1965-),女,陕西宝鸡人,博士,研究员,主要从事流域侵蚀产沙、土壤侵蚀与植被关系及水土保持效益评价。E-mail:jyjiao@ms.iswc.ac.cn