| 摘要: |
| 【目的】研究HEC-RAS模型在汉江上游洪水演进和流量重建中的应用效果。【方法】通过对汉江上游安康至白河段的实地考察，基于数字流域平台及HEC-RAS模型对2010年“7·18”、2011年“9·19” 2场洪水进行了演进模拟，并结合ArcGIS重现了2场洪水的淹没范围和水深。运用HEC-RAS模型对考察发现的5次洪痕进行洪峰流量的重建，与利用比降面积法的重建结果进行比对，并利用实测数据对重建结果进行了验证。【结果】模型的率定、2场洪水水位与流量等指标的模拟系列和实测系列的纳什效率系数(NSE)及确定性系数(R2)均大于0.91；此外，基于HEC-RAS模型重现的淹没区域与实地调查所得结果吻合度较好，且根据洪痕重建的洪峰流量误差为0.12%~2.88%，重建精度较高，优于比降面积法。【结论】HEC-RAS模型可用于汉江上游洪水的演进模拟和洪峰流量的重建，可视化的淹没范围、水深等成果可为安康市洪灾风险评价提供基础数据。 |
| 关键词: 洪水演进 流量重建 洪痕 HEC-RAS 汉江上游 |
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| 基金项目:国家自然科学基金项目(71471071)；国家社会科学基金项目(14BZS070)；中央高校基本科研业务费专项(GK201601006) |
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| Application of HEC-RAS model in flood routing and discharge reconstruction of the upper reaches of Hanjiang River |
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WANG Guangpeng,ZHA Xiaochun,HUANG Chunchang,et al
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| Abstract: |
| 【Objective】This paper applied the HEC-RAS model in flood routing and discharge reconstruction of the upper reaches of Hanjiang River.【Method】Through the field investigation in the upper reaches of the Hanjiang River,two floods were simulated based on the platform of digital basin,the HEC-RAS model and ArcGIS to reproduce the submerged ranges and water depths of the two floods.Besides,the HEC-RAS model was used to reconstruct the flood peak discharges of five flood marks,and the reconstruction results were compared with the calculation by slope area method,and verified by the measured data.【Result】The efficiency coefficient NSE and the certainty coefficient R2 between simulation and measured series were>0.91.The flooded area based on the HEC-RAS model was in good agreement with the results obtained from field survey with the peak flow error of 0.12%-2.88%.The reconstruction accuracy was higher than the slope-area method.【Conclusion】The HEC-RAS model can be used for flood routing and reconstruction of flood discharge in the upper reaches of Hanjiang River.The visual submerged area and water depth would provide data support for flood disaster risk assessment in Ankang. |
| Key words: flood routing discharge reconstruction flood level mark HEC-RAS upper reaches of Hanjiang River |
