基于HEC-RAS的丹江古洪水水文学恢复研究  

Hydrology Reconstruction of the Palaeoflood Based on the HEC-RAS Model in the Danjiang River

作　　者：李晓刚[1] 黄春长[2] 

机构地区：[1]商洛学院城乡规划与建筑工程学院,陕西商洛726000 [2]陕西师范大学旅游与环境学院,陕西西安710062

出　　处：《商洛学院学报》2016年第6期71-75,共5页Journal of Shangluo University

基　　金：陕西省教育厅专项科研计划项目(15JK1224);商洛市科学技术研究计划项目(SK2014-01-05)

摘　　要：为了获取丹江流域万年尺度水文数据,对丹江河谷进行深入的野外考察,在上游竹林关段发现夹有四层古洪水滞流沉积层的全新世黄土—古土壤剖面.采用＂厚度-含沙量法＂恢复丹江上游竹林关段四次古洪水洪峰水位,运用ArcGIS耦合HEC-RAS模型法恢复洪峰流量.结果表明,水位为404.4-412.5 m,流量为8570-23350 m^3·s^-1.在同一河段利用2010年7月现代大洪水遗留水位痕迹恢复其流量,与实测数据相对误差仅为2.91%,这充分说明采用该模型恢复丹江上游竹林关段全新世古洪水洪峰流量是准确的.研究结果使得丹江流域水文序列从数十年实测数据延伸至万年尺度,获取了全新世四次特大洪水水位和流量数据,对丹江流域的洪水管理、开发、治理、调度提供了重要的基础资料.Field investigations were carried out along the upper reaches gorge of the Danjiang River. A set of 4 palaeoflood slackwater deposit beds （ SWDs） of the Holocene age were found in the depth range of 10 -40 cm by using the sedimentological criteria at the LZT sites. The palaeoflood peak stages were estimated with the elevations and the deposition depths of the SWD. The paleoflood stage were between 404.4 m and 412.5 m. The palaeoflood peak discharges were estimated by using the HEC-RAS one dimensional model running within an ArcGIS environment. The results indicated that these palaeoflood discharges were between 8 570m^3·s^-1 and 23 350 m^3·s^-1. Based on the flood stage indicators, the peak discharges of modern floods were also reconstructed in the same reach using the HEC-RAS model and the same hydraulic parameters. The error between the reconstructed and gauged peak flood discharges is 2.91%. These showed that the palaeoflood peak discharges reconstructed by using the HEC-RAS model are reliable. This result provides reference in hydrological engineering, water resource management and flood mitigation on the river.

关 键 词：HEC-RAS 水文恢复 古洪水 丹江 

分 类 号：P331.1[天文地球—水文科学]