| 洞庭湖城陵矶水道水力几何形态的研究 |
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| 引用本文： | 黎明.洞庭湖城陵矶水道水力几何形态的研究[J].湖泊科学,1997,9(2):112-116. |
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| 作者姓名： | 黎明 |
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| 作者单位： | 南京大学城市与资源学系!南京210093 |
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| 基金项目： | 国家自然科学基金!49271010 |
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| 摘 要： | 根据１９５１－１９８８年洞庭湖城陵矶站的水文测验资料，运用Ｌ．Ｂ．Ｌｅｏｐｏｌｄ河床力几何形态原理，建立洞庭湖出口－城陵矶水道河相关系式，研究该水道水力几何形态的特点及变化。研究表明，与河流水道相比，洞庭湖出口水道河宽指数ｂ随流量的变化较小，而水深指数ｆ及流速指数ｍ随流量的变化较大，河床横面具有窄深的特点。
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| 关 键 词： | 洞庭湖 水力几何形态 湖泊 水流 城陵矶水道 |
| 收稿时间： | 1996/10/5 0:00:00 |
| 修稿时间： | 1996/11/14 0:00:00 |
The Hydraulic Geometry of Chenglingji Outlet, Dongting Lake |
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| Li Ming.The Hydraulic Geometry of Chenglingji Outlet, Dongting Lake[J].Journal of Lake Science,1997,9(2):112-116. |
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| Authors: | Li Ming |
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| Institution: | Department of Urban and Resource Sciences.Nanjing University, Nanjing 210093 |
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| Abstract: | Based on the hydrologic data from Chenglingji (Qilishan) Hydrologic Station, Dongting Lake from 1951 to 1988, the formuIa of hydraulic geometry in the section of Chenglingji - Dongting Lake mouth - are constructed according to L. B. Leopood's principle on hydraulic geometry of stream channels. In addition, the characteristics and changes of hydraulic geometry of stream channels are also studied. As a result, the stream channel width exponent b of Chenglingji outlet changes little with the discharge, whereas the deepth exponent f and the veloclty exponent m change greatly with the discharge. Moreover, the cross section of the Chenglinji outlet is getting narrow and deep. The main reason is that the deposition processes of the Dongting Lake leads to an increase in the sediment transport capacity of Cherglinji outlet, while the eroding processes take place in the channel bottom mainly. In the past 40 years, because of the natural depositions of flood diversion in 3 waterways of the Jingjiang River as well as the influences of the curve cutoff of the Low Jingjiang River in 1967 - 1972, the values of m and m/f are increasing with each passing way and the sediment transport rate is decreasing obviously in Chenglingji outlet. All of these make sediment transport capacity increase and the eroding processes of the streatn channel strong, resulting a deep and narrow cross section of the outlet. |
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| Keywords: | Dongting Lake hydraulic geometry of stream channels |
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