Study on Mechanism of Local Scour in downstream of Bed Protection Works

护床工程下游局部冲刷机理研究

• 批准号: 14550519
• 负责人: KANDA Keiichi
• 金额: $ 1.73万
• 依托单位: Akashi National College of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2002
• 资助国家: 日本
• 起止时间: 2002 至 2003
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-14550519/
• 关键词: LOCAL SCOUR; BED PROTECTION WORKS HYDRAULIC EXPERIMENT; NUMERICAL SIMULATION; RICH-IN-NATURE RIVER WORKS; 多自然型工法; 河道横断構造物; 粗度急変部; 河川環境; 多自然型河づくり

THIS STUDY DEALS WITH LOCAL SCOUR IN DOWNSTREAM OF BED PROTECTION WORKS IN ORDER TO ESTABLISH THE REASONABLE DESIGN OF THE BED PROTECTION WORKS. THE CONCLISIONS OF THIS STUDY CAN BE DRAWN AS FOLLOWS.1.A DETAILD FIELD SURVEY WAS CARRIED OUT REGARDING LOCAL SCOUR AT THE SECTION OF NINOARATE WEIR HAVING A BROAD CRESTE AND CULVERTS IN HYAKKEN RIVER, PREPARATIONS FOR MEASURING STREAM CONDITIONS AND SCOUR DEPTH AT A FLOOD WERE MADE.2.THE EXPERIMENTS WERE CARRIED OUT IN CASE OF SUDDEN CHANGE IN BED ROUGHNESS LONGITUDINALLY FROM A ROUGH BED CONSISTING OF THREE TYPES OF BED PROTECTION WORKS TO A MOVABLE BED UNDER DYNAMIC CONDITION OF BED LOAD. VARIATIONS OF BED PROFILE AND THE MAXIMUM DEPTH OF SCOUR HOLE WERE DISCUSSED AND FLOW CHARACTERISTICS WERE MEASURED AT SEVERAL STAGES OF SCOUR. AS THE RESULT, A METHOD TO REDUCE SCOUR DEPTH BY USING RICH-IN-NATURE TYPE RUBBLE WORKS WAS PROPOSED.3.BASED ON THESE RESULTS, 2-D NUMERICAL SIMULATIONS FOR LOCAL SCOUR IN DOWNSTREAM OF BED PROTECTION WORKS USING BOUNDARY FITTED COORDINATE SYSTEM WERE PROPOSED AND APPLIED TO THE EXPERIMENTS. COMPARING THE NUMERICAL AND EXPERIMENTAL RESULTS VERIFIED THE ABILITY OF THIS MODEL TO PREDICT THE SCOUR PROCESS

本研究针对床防护工程下游局部冲刷问题进行研究，以期建立床防护工程的合理设计。研究结论如下： 1、对哈肯河宽顶涵洞二水堰断面的局部冲刷进行了详细的实地调查，为洪水时的水流状况和冲刷深度测量做好了准备2、床面粗糙度纵向突变情况下由三类床面防护工程组成的粗糙床面到动态床面下的移动床面进行了实验 床载状况。讨论了床层剖面的变化和冲刷孔的最大深度，并测量了冲刷的几个阶段的流动特性。在此基础上，提出了利用富质型碎石工程减少冲刷深度的方法。 3.在此基础上，提出了采用边界拟合坐标系对河床防护工程下游局部冲刷进行二维数值模拟，并将其应用到工程中。实验。数值结果与实验结果的比较验证了该模型预测冲刷过程的能力

项目成果

神田佳一, 前田英史: "ジオテキスタイル製ふとん篭護床工下流部の河床変動に関する模型実験"第59回土木学会年次学術講演会概要集. (2004)

Keiichi Kanda、Hidefumi Maeda：“土工织物床垫保护结构下游河床波动的模型实验”日本土木工程学会第 59 届年度学术会议摘要集（2004 年）。

神田佳一: "百間川二の荒手分流堰周辺部の局所洗掘とその軽減法に関する実験的研究"明石工業高等専門学校研究紀要. 45. 103-108 (2003)

神田圭一：“百间川尼阿拉特引水堰周围局部冲刷及其缓解方法的实验研究”明石工业大学研究公报45. 103-108（2003）。

青木智幸, 神田佳一: "水抜き管を有する広頂堰下流部の洗掘軽減法に関する実験的研究"第58回土木学会年次学術講演会概要集. II-89-1-II-89-2 (2003)

青木智之、神田庆一：《带排水管的宽顶堰下游冲刷缓解方法的实验研究》日本土木工程学会第58届年会学术会议摘要集II-89-1-II-。 89 -2 (2003)

Kanda K: "Experimental Study on Local Scour and its Reduction around the Ninoarate Weir in the Hyakken River"3rd IAHR Symposium on River, Coastal and Estuarine Morphodynamics, Barcelona. 3. 1197-1206 (2003)

Kanda K：“Hyakken 河 Ninoarate 堰周围局部冲刷及其减少的实验研究”第三届 IAHR 河流、沿海和河口形态动力学研讨会，巴塞罗那。

S.MAENO: "FUNDAMENTAL STUDY ON LOCAL SCOUR AROUND THE NINOARATE WEIR IN THE HYAKKEN RIVER"ADVANCES IN RIVER ENGINEEING.. VOL. 8. 261-266 (2002)

S.MAENO：“哈肯河 NINOARATE 堰周围局部冲刷的基础研究”河流工程进展..卷。