基于DEM和LWLR的河道断面构造方法及应用研究  

Method and Application of River Section Construction Based on DEM and LWLR

作　　者：熊子云 孙营营[1] 朱晓敏 胡思波 谢文龙 陆宝宏[1] 姚泰伦 XIONG Ziyun;SUN Yingying;ZHU Xiaomin;HU Sibo;XIE Wenlong;LU Baohong;YAO Tailun(School of Hydrology and Water Resources,Hohai University,Nanjing 210024,Jiangsu,China;Huaneng Lancang River Hydropower Inc.,Kunming 650209,Yunnan,China;PowerChina Zhongnan Engineering Corporation Limited,Changsha 410014,Hunan,China)

机构地区：[1]河海大学水文水资源学院,江苏南京210024 [2]华能澜沧江水电股份有限公司,云南昆明650209 [3]中国电建集团中南勘测设计研究院有限公司,湖南长沙410014

出　　处：《水力发电》2025年第5期17-24,共8页Water Power

基　　金：国家自然科学基金联合基金项目(U2240218);中国华能集团科技项目(HNKJ22-H87TB);金沙江旭龙水电站建设期影响区域环境水体监测及评估项目(XL-FW-2023-012)。

摘　　要：针对采用DEM数据进行山区河道水动力模拟时运行中断和模拟效果不佳的问题,提出了一种基于DEM和LWLR的河道断面构造方法,以解决模型运行不稳定问题,提高水力学模型的模拟效果。首先,从DEM中提取各断面最低点,对于非唯一最低点,采用相邻断面最低点插值处理;然后,通过局部加权线性回归算法平滑河段河底高程,进而构造出更为精准的河道断面。将该方法应用于金沙江上游直门达至巴塘的水动力模拟中,并采用岗拖站的水位和流量资料进行模型的率定与验证。研究结果表明,与直接从DEM提取河道断面相比,该方法确保了水动力模型的稳定运行,节省了建模和模型运行的时间,有利于大规模河网的建模与分析;水位确定性系数、流量确定性系数和峰现时间分别提升了1.11%、0.89%、1.2 h,这进一步验证了此方法的实用性及其在地形资料匮乏地区进行水动力计算的应用价值。This paper proposes a river section construction method based on DEM and LWLR to solve the problem of unstable model operation and improve the simulation effect of hydraulic models,in response to the problems of interruption and poor simulation effect in mountain river hydrodynamic simulation based on DEM data.This method first extracts the lowest points of each section from DEM,and for non unique lowest points,adjacent section lowest points are interpolated.Subsequently,the local weighted linear regression algorithm is used to smooth the riverbed elevation of the river section,thereby constructing a more accurate river cross-section.Apply this method to the hydrodynamic simulation from Zhimen to Batang in the upper reaches of the Jinsha River,and calibrate and validate the model using water level and flow data from Gangtuo Station.The research results indicate that,(a)compared with directly extracting river cross-sections from DEM,this method ensures the stable operation of hydrodynamic models,saves modeling and model running time,and is conducive to the modeling and analysis of large-scale river networks;and(b)the water level certainty coefficient,flow certainty coefficient,and peak occurrence time are increased by 1.11%,0.89%,and 1.2 hours,respectively,which verified the practicality of this method and its application value in hydrodynamic calculations in areas with scarce terrain data.

关 键 词：DEM LWLR 构造断面 水动力学模型 金沙江上游 

分 类 号：TV122[水利工程—水文学及水资源]