Integration of In Situ and Remote Sensing Measurements for the Management of Harmful Cyanobacteria Blooms. A Lesson from a Strategic Multiple-Uses Reservoir (Lake Occhito, South Italy)

Water

Mariano Bresciani¹  Raffaella Matarrese²  Licia Guzzella³  Diego Copetti³ 

[1] Institute for Electromagnetic Sensing of the Environment, National Research Council of Italy, IREA-CNR, Section of Milano, Via Bassini 15, 20133 Milan, MI, Italy;Water Research Institute, National Research Council of Italy, IRSA-CNR, Section of Bari, Via De Blasio 5, 70132 Bari, BA, Italy;Water Research Institute, National Research Council of Italy, IRSA-CNR, Section of Brugherio, Via del Mulino 19, 20861 Brugherio, MB, Italy;

关键词: harmful cyanobacteria blooms;    microcystins;    multiple-uses reservoirs;    irrigation network;    in situ measurements;    remote sensing;   

DOI  :  10.3390/w13162162

来源: DOAJ

【 摘 要 】

Harmful cyanobacteria blooms (HCBs) are one of the main water quality threats affecting reservoirs. Guidelines suggest integrating laboratory, real-time in situ, and remote sensing data in the monitoring of HCBs. However, this approach is still little adopted in institutional measuring programs. We demonstrated that this integration improves frequency and spatial resolution of the data collection. Data were from an intense HCB (Planktothrix rubescens), which occurred in a south Italy multiple-uses reservoir (Lake Occhito) between 2008 and 2009 and regarded both the lake and the irrigation network. Laboratory and in situ fluorometric data were related to satellite imagery, using simple linear regression models, to produce surface lake-wide maps reporting the distribution of both P. rubescens and microcystins. In the first node of the distribution network, microcystin concentrations (4–10 µg L⁻¹) reached values potentially able to damage the culture and to accumulate during cultivation. Nevertheless, our study shows a decrease in the microcystin content with the distance from the lake (0.05 µg L⁻¹ km⁻¹), with a reduction of about 80% of the microcystin concentrations at the furthest tanks. Recent improvements in the spatial resolution (i.e., tens of meters) of satellite imagery allow us to monitor the main tanks of large and complex irrigation systems.

【 授权许可】

Unknown