| 引用本文: | 柯文莉,陈成忠,吉红霞,陈秘,刘元波.洞庭湖水面面积与城陵矶水位之间的绳套关系.湖泊科学,2017,29(3):753-764. DOI:10.18307/2017.0325 |
| KE Wenli,CHEN Chengzhong,JI Hongxia,CHEN Mi,LIU Yuanbo.A loop-like relationship between water surface area of Lake Dongting and water level at Chenglingji, the Yangtze River. J. Lake Sci.2017,29(3):753-764. DOI:10.18307/2017.0325 |
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| 摘要: |
| 洞庭湖是我国第二大淡水湖，与长江连通，在防洪抗旱和湿地生态保护等方面具有重要的现实意义.采用Terra/MODIS L1B遥感数据，提取了2000-2012年洞庭湖水面面积，结合同期城陵矶水位观测数据，建立了城陵矶水位与洞庭湖水面面积的绳套关系曲线.分析结果表明：20002012年间，洞庭湖水面面积呈现总体减少的趋势；在季节上表现为规律性的涨落，具有明显的涨（4-6月）-丰（7-9月）-退（10-12月）-枯（1-3月）的水文特征；在空间格局上表现为由湖体中心向外扩张，随后由外向湖体中心逐渐收缩的变化过程；洞庭湖水面面积与城陵矶水位之间具有较高的相关性，但不同时期的相关系数存在一定的差异：枯水期二者相关性较低，丰水期相关性最高，涨水期和退水期相关性较高；这种差异与各个时期的主导因素不同有关，长江来水对枯水期、丰水期的绳套关系影响较大，其中东洞庭湖最为明显；不论丰水年（2002年）或干旱年（2011年），洞庭湖水面面积变化与城陵矶水位之间的相关性均较高.研究结果对于深入认识江湖关系的宏观复杂性、长江中下游地区以及洞庭湖水域洪涝灾害的预防和治理都具有积极的意义. |
| 关键词: 长江 洞庭湖 江湖关系 水位-面积曲线 水文遥感 |
| DOI：10.18307/2017.0325 |
| 分类号: |
| 基金项目:国家重点基础研究发展计划“973”项目（2012CB417003）；中国科学院南京地理与湖泊研究所“一三五”战略发展规划项目（NIGLAS2012135001） |
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| A loop-like relationship between water surface area of Lake Dongting and water level at Chenglingji, the Yangtze River |
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KE Wenli1,2, CHEN Chengzhong1, JI Hongxia2, CHEN Mi1,2, LIU Yuanbo2
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1.Hubei Normal University, Huangshi 435000, P.R.China;2.Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, P.R.China
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| Abstract: |
| Lake Dongting is the second largest freshwater lake in China, directly connected to the Yangtze River. It has significance of practical effects on flood control, drought prevention and wetland conservation. This study addresses spatial-temporal variation in water surface area of Lake Dongting and its relationship with water level at Chenglingji of the Yangtze River. Water surface area were extracted from multi-temporal images of the Terra/MODIS (moderate-resolution imaging spectroradiometer) for the years 2000-2012. In combination of water level data of Chenglingji, a loop-like relationship was explored between the lake water surface area and the water level. Our results show that the lake area decreased from 2000 to 2012, with a strong seasonal variation in terms of rising (April-June), flooding (July-September), retreating (October-December) and drying (January-March) periods. The inundated area displays a seasonal change of spatial pattern with expansion from lake center to its maximum bounds during February-August and contraction from its maximum bounds to lake center during September-January. The lake water surface has a good correlation with the water level at Chenglingji and the correlation coefficient varies in seasons with the minimum value for drying period, the maximum for flooding period, and relatively high values for rising and retreating periods. The variation is probably related to the difference in controlling factors in different time periods. The Yangtze River has a relatively large impact on the loop-like relationship in drying season and flooding season, especially for the east Lake Dongting, which is the case even for high-and low-water years. Our findings offer an insight into the complexity of river-lake relationship and provide an important basis for flooding prevention in Lake Dongting and the mid-and lower-reaches of Yangtze River. |
| Key words: Yangtze River Lake Dongting river-lake relationship area-water level curve hydrologic remote sensing |
