本文關鍵詞： 葉綠素a 洪澤湖 時空變化 MERIS 氣候變化 淮河　出處：《環(huán)境科學》2017年09期 　論文類型：期刊論文

【摘要】：葉綠素a(Chl-a)濃度是衡量藻類生物量及評價水體營養(yǎng)狀態(tài)的重要指標.基于洪澤湖2016年7月、2016年12月共49個實測水質(zhì)參數(shù)與同步光譜數(shù)據(jù),驗證了5種可應用于MERIS/OLCI數(shù)據(jù)的Chl-a遙感估算模型(包括波段比值模型、三波段模型、FLH模型、MCI模型以及UMOC模型)在洪澤湖水域的適用性.結果表明,UMOC模型是最適用于洪澤湖水域的Chl-a濃度估算模型,其平均相對誤差為32.30%,低于波段比值模型的75.17%,三波段模型的62.44%,FLH模型的45.87%和MCI模型的56.95%.進而利用UMOC模型,結合MERIS數(shù)據(jù),獲取了洪澤湖2002~2012年Chl-a濃度遙感估算產(chǎn)品,并分析了洪澤湖Chl-a濃度的時空變化規(guī)律.洪澤湖Chl-a濃度具有明顯的時空差異性.依據(jù)水體像元長時間序列月平均Chl-a濃度的差異,將洪澤湖水體分為了區(qū)域A、區(qū)域B和區(qū)域C這3種類型.區(qū)域B和區(qū)域C水體無明顯的變化趨勢,區(qū)域A則顯著增加.與氣象因子的相關性分析表明,區(qū)域B和區(qū)域C年平均Chl-a的波動主要受年降水量的影響,反映了該2個區(qū)域Chl-a濃度的變化主要受湖流強度的控制,區(qū)域A年平均Chl-a濃度的變化與年平均風速呈顯著負相關性,風速下降的氣候大背景可能會加重這一區(qū)域的富營養(yǎng)化程度,威脅南水北調(diào)的水質(zhì)安全.此外,在汛期(7~9月)洪澤湖水體Chl-a濃度與離淮河入湖口的距離呈顯著的正相關關系,證明了這一時期淮河對洪澤湖藻類濃度具有明顯的抑制作用.
[Abstract]:Chlorophyll a Chl-a) concentration is an important index to measure algal biomass and evaluate the nutrient status of water body based on Hongze Lake in July 2016. In December 2016, 49 measured water quality parameters and synchronous spectral data were measured, and five Chl-a remote sensing estimation models (including band ratio model) were verified. The applicability of MCI model and UMOC model in Hongze Lake waters is shown. UMOC model is the most suitable model for estimating the concentration of Chl-a in Hongze Lake. Its average relative error is 32.30, which is lower than that of the ratio model of wave band 75.17%. 62.44 of the three-band model and 45.87% of the FLH model and 56.95of the MCI model. Then the UMOC model is used to combine the MERIS data. The remote sensing estimation products of Chl-a concentration from 2002 to 2012 in Hongze Lake were obtained. The temporal and spatial variation of Chl-a concentration in Hongze Lake was also analyzed. The Chl-a concentration of Hongze Lake had obvious difference in time and space. According to the difference of the monthly average Chl-a concentration in the long time series of water bodies, the variation of Chl-a concentration in Hongze Lake was analyzed. The water body of Hongze Lake is divided into three types: area A, region B and region C. there is no obvious change trend in area B and C, but there is a significant increase in area A. the correlation analysis with meteorological factors shows that the water body of Hongze Lake can be divided into three types. The fluctuation of average annual Chl-a in region B and C is mainly affected by annual precipitation, which indicates that the variation of Chl-a concentration in these two regions is mainly controlled by the intensity of lake flow. The variation of annual average Chl-a concentration in A area is significantly negatively correlated with the annual average wind speed, and the climate background of wind speed decline may aggravate the eutrophication degree of this area. In addition, there is a significant positive correlation between the concentration of Chl-a in Hongze Lake and the distance from the entrance of the Huaihe River to the mouth of the Huai River during the flood season from 7 to September. It is proved that the Huaihe River has obvious inhibitory effect on algae concentration in Hongze Lake during this period.
【作者單位】： 南京師范大學虛擬地理環(huán)境教育部重點實驗室;江蘇省地理信息資源開發(fā)與利用協(xié)同創(chuàng)新中心;
【基金】：國家自然科學基金項目(41671340) 國家重點研發(fā)計劃項目(2017YFB0503902)
【分類號】：X524;X87
【正文快照】： 南京210023)葉綠素a(Chl-a)濃度是藻類生物量重要指標,是水質(zhì)的重要表征參數(shù),也是我國水環(huán)境必須監(jiān)測的指標[1].湖泊Chl-a濃度的調(diào)查不僅可以確定水體的營養(yǎng)狀態(tài),為湖泊治理和漁業(yè)資源管理提供基礎信息,而且有助于深刻理解和研究湖泊生態(tài)系統(tǒng)的生物地球化學循環(huán)過程以及其對氣，

本文編號：1470396