摘要
为明确洞庭湖水华发生规律、水体面积的变化规律及其影响因子,利用MODIS传感器提供的MOD02HKM数据,采用多波段水体指数(MBWI)模型、浮游藻类指数(FAI)方法识别、提取洞庭湖水体、水华范围,并对2001~2015年洞庭湖水体、水华时空分布数据进行分析.结果表明:洞庭湖的水面范围在年内呈现明显的季节变化,在年际成缩减趋势.水域面积由大到小依次是夏季、秋季、春季、冬季,且2001~2015年丰水期水体的平均面积是枯水期的2.2倍;2001~2015年洞庭湖水域面积萎缩速率为-14.574km^2/a,其中夏季的萎缩速率最大,达到-38.678km^2/a;2001~2015年期间,洞庭湖区域均发生水华,水华主要集中发生在东洞庭湖的西部湖湾区,西洞庭湖和南洞庭湖的水华则沿河岸零星分布;洞庭湖水华存在明显的季节变化和年季变化.每年水华面积基本呈现正态分布,最小值出现在冬季,最大值出现在夏季和秋季,其值达到681.43km^2;2001~2015年水华爆发面积最高占全湖面积的18.2%,水华面积年平均变化率为-8.657km^2/a,水华爆发面积呈现缩小的趋势.
In order to clarify the regularity of Dongting Lake blooms, the changing rule of water area and its influencing factors, the MODIS02 HKM images were used as the main data sources in the study. The Floating Algae Index(FAI) and a Multi-band Water Index(MBWI) were adopted to identify and extract the water and the scope of algal bloom in Dongting Lake. the temporal and spatial distribution data of water and algal bloom in Dongting Lake in the past 2001~2015 years were analyzed. The research conclusions were as follows: Firstly, the water area of Dongting Lake presented obvious seasonal change in years and a inter-annual reduced trend. The area of water was in order of summer, autumn, spring and winter. In the 2001~2015 year, the average area of water was 2.2 times that of the dry season. Secondly, the area shrinkage rate of Dongting Lake in 2001~2015 was-14.574 km^2/a, and the largest rate was-38.678 km^2/a in summer. Thirdly, from 2001 to 2015, algal bloom occurred annually in the Dongting Lake area, large-scale algal blooms were usually found in the western part of Dongting Lake. The algal bloom of the West Dongting Lake and the South Dongting Lake were scattered along the river bank. Fourthly, the seasonal and inter-annual seasonal variations of blooms in Dongting Lake were significant. The area of water bloom basically presented normal distribution every year. The minimum value appeared in winter and the maximum value appeared in summer and autumn. The minimum value of algal boom was appeared in winter time, whilst, the maximum value of algal boom appeared in summer and autumn. Its maximum value reached to 681.43 km^2. The largest algal bloom in 2001~2015 years accounted for 16.693% of the total Lake area. The annual average change rate of algal bloom area was-8.657 km^2/a. Algal blooms showed a trend of area reduction.
作者
曹萌萌
毛克彪
严毅博
崔京路
袁紫晋
Nusseiba
CAO Meng-meng;MAO Ke-biao;YAN Yi-bo;CUI Jing-lu;YUAN Zi-jin;Nusseiba(Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081,China;School of Computer and Communication,Fujian Agriculture and Forestry University, Fuzhou 350002,China)
出处
《中国环境科学》
EI
CAS
CSCD
北大核心
2019年第6期2523-2531,共9页
China Environmental Science
基金
国家自然科学基金资助项目(41571427)
国家重点研发计划重点专项(2016YFC0500203)
关键词
洞庭湖
水体面积
水华
时空分布
MODIS数据
Dongting Lake
water body area
algal bloom
change of temporal and Spatial
MODIS
