| 珠江三角洲网河区低水位时空变化规律 |
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| 引用本文： | 陆永军,季荣耀,王志力,顾继一,贾良文,莫思平.珠江三角洲网河区低水位时空变化规律[J].水科学进展,2019,30(6):800-809. |
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| 作者姓名： | 陆永军 季荣耀 王志力 顾继一 贾良文 莫思平 |
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| 作者单位： | 1.南京水利科学研究院水文水资源与水利工程科学国家重点实验室, 江苏南京 210029; |
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| 基金项目： | 国家自然科学基金资助项目（51520105014）；国家重点研发计划资助项目（2017YFC1404200） |
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| 摘 要： | 珠江三角洲近30年的大规模无序采挖沙改变了网河区水多沙少、河势稳定的演变趋势，促使河床由缓慢淤积转变为大幅下切，低水位出现明显下降。这种人为作用已涵盖并远超同期河流自然演变的程度，对取水供水、生态保护、航运保障等产生了较大影响。在总结河口三角洲地区水位变化研究的基础上，以珠江三角洲网河区为例，按低水位变化划分为常年潮流段、季节性潮流段和常年径流段。其中，常年潮流段基本不受采砂影响；季节性潮流段依据径流、潮流比例，越靠近枯水潮流界，低水位变化越大；常年径流段还存在溯源冲刷引起的低水位下降。结合水沙变异过程，试图探讨水动力对河床急剧演变的响应机制，以期为通航低水位设计提供依据。
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| 关 键 词： | 低水位 时空变化 人工采砂 溯源冲刷 珠江三角洲 |
| 收稿时间： | 2019-01-01 |
Spatial-temporal variation of low water level in the channel network system of the Pearl River Delta |
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| LU Yongjun,JI Rongyao,WANG Zhili,GU Jiyi,JIA Liangwen,MO Siping.Spatial-temporal variation of low water level in the channel network system of the Pearl River Delta[J].Advances in Water Science,2019,30(6):800-809. |
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| Authors: | LU Yongjun JI Rongyao WANG Zhili GU Jiyi JIA Liangwen MO Siping |
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| Institution: | 1.State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Nanjing Hydraulic Research Institute, Nanjing 210029, China;2.School of Marine Sciences, Sun Yat-sen University, Guangzhou 510275, China |
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| Abstract: | Large-scale and disorderly sand excavation in the Pearl River Delta in recent 30 years has changed the evolution trend of more water and less sediment and the stable river regime,promoting the change of riverbed from slow deposition to large erosion,and the low water level has decreased significantly. This artificial effect has covered and far exceeded the natural evolution of rivers in the same period,and has a crucial impact on water intake and supply,ecological protection,shipping security and so on. On the basis of summarizing the study of water level changes in deltas and estuaries,this paper takes the Pearl River Delta network system as an example,and divides it into perennial tidal current section,seasonal tidal current section and perennial runoff section according to the change of low water level. Among them,the perennial tidal current section is basically not affected by sand excavation;the closer the seasonal tidal current section is to the low-water tidal current boundary,the greater the change of low-water level;and the lower-water level is caused by backward erosion in the perennial runoff section. Combined with the process of water and sediment variation,this paper attempts to explore the response mechanism of hydrodynamics to the rapid evolution of riverbed,in order to provide basis for navigation low water level design. |
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| Keywords: | low water level spatial-temporal variation sand excavation backward erosion the Pearl River Delta |
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