scholarly journals How to Implement User-Friendly BLMs in the Absence of DOC Monitoring Data: A Case Study on Bulgarian Surface Waters

Water ◽  
2022 ◽  
Vol 14 (2) ◽  
pp. 246
Author(s):  
Tony Venelinov ◽  
Stefan Tsakovski
Keyword(s):  
Surface Water ◽  
Surface Waters ◽  
Historical Data ◽  
Monitoring Network ◽  
Water Bodies ◽  
Monitoring Networks ◽  
Biotic Ligand ◽  
Surface Water Bodies ◽  
User Friendly

The metal bioavailability concept is implemented in the Water Framework Directive (WFD) compliance assessment. The bioavailability assessment is usually performed by the application of user-friendly Biotic Ligand Models (BLMs), which require dissolved metal concentrations to be used with the “matching” data of the supporting physicochemical parameters of dissolved organic carbon (DOC), pH and Cadissolved. Many national surface water monitoring networks do not have sufficient matching data records, especially for DOC. In this study, different approaches for dealing with the missing DOC data are presented: substitution using historical data; the appropriate percentile of DOC concentrations; and combinations of the two. The applicability of the three following proposed substitution approaches is verified by comparison with the available matching data: (i) calculations from available TOC data; (ii) the 25th percentile of the joint Bulgarian monitoring network DOC data (measured and calculated by TOC); and (iii) the 25th percentile of the calculated DOC from the matching TOC data for the investigated surface water body (SWB). The application of user-friendly BLMs (BIO-MET, M-BAT and PNEC Pro) to 13 surface water bodies (3 reservoirs and 10 rivers) in the Bulgarian surface waters monitoring network outlines that the suitability of the substitution approaches decreases in order: DOC calculated by TOC > the use of the 25th percentile of the data for respective SWB > the use of the 25th percentile of the Bulgarian monitoring network data. Additionally, BIO-MET is the most appropriate tool for the bioavailability assessment of Cu, Zn and Pb in Bulgarian surface water bodies.

scholarly journals Short communication: Quantitative spatial analysis of randomly situated surface water bodies through f-αspectra

2001 ◽  
Vol 6 (3) ◽  
pp. 213-217 ◽  
Author(s):  
B. S. Daya Sagar
Keyword(s):  
Spatial Distribution ◽  
Surface Water ◽  
Short Communication ◽  
Probability Distributions ◽  
Water Bodies ◽  
Spatial Organisation ◽  
Data Set ◽  
Surface Water Bodies ◽  
Quantitative Spatial Analysis

A notable similarity is observed between the probability distributions obtained from a data set that contains a large number of randomly situated surface water bodies and the probability distributions estimated by binomial multiplicative process. From these well conformed probability distributions, the generalised information dimensions have been computed through f-αspectra to characterise and quantify the spatial organisation of the surface water bodies. It is noticed from the investigated case study that the results tend to vary by changing the direction of bisecting process. The experimental results on spatial distribution of surface water bodies of the study area qualify that the computed generalised information dimensions for the vertical bisecting is rather uniform than that of the horizontal bisecting process.

Inferring the interconnections between surface water bodies, tile-drains and an unconfined aquifer–aquitard system: A case study

2016 ◽  
Vol 537 ◽  
pp. 86-95 ◽  
Author(s):  
N. Colombani ◽  
D. Di Giuseppe ◽  
B. Faccini ◽  
G. Ferretti ◽  
M. Mastrocicco ◽  
...  
Keyword(s):  
Surface Water ◽  
Unconfined Aquifer ◽  
Water Bodies ◽  
System A ◽  
Tile Drains ◽  
Surface Water Bodies

scholarly journals Proximal VIS-NIR spectrometry to retrieve substance concentrations in surface waters using partial least squares modelling

2018 ◽  
Vol 19 (4) ◽  
pp. 1204-1211 ◽  
Author(s):  
A. Wagner ◽  
S. Hilgert ◽  
T. Kattenborn ◽  
S. Fuchs
Keyword(s):  
Remote Sensing ◽  
Water Quality ◽  
Surface Water ◽  
Least Squares ◽  
Partial Least Squares ◽  
Surface Waters ◽  
Suspended Solids ◽  
Quality Parameters ◽  
Water Bodies ◽  
Surface Water Bodies

Abstract Many water quality parameters such as concentrations of suspended matter, nutrients and algae directly or indirectly change the electromagnetic reflectance and transmission properties of surface water bodies. Optical measurement approaches have shown great potential to partially substitute water sampling and laboratory analyses, but are obstructed by limited flexibility or high maintenance demands. In order to overcome these problems and to bridge the gap between in situ and remote sensing measurements, the use of close-range, above-surface reflectance measurements in the VIS-NIR domain to measure water quality parameters in surface water bodies was investigated. Remote sensing reflectance in a 1 m³ water tank with increasing, known concentrations of suspended solids was measured. A partial least squares model was trained to predict concentrations from reflectance curves, which performed well, considering the wide range of concentrations and illumination conditions (R²cal = 0.96, R²val = 0.97). The approach was then transferred to the field and further parameters were tested. Using a semi-autonomous spectrometer mounted to a boom stand on a motor boat, we traced substance concentrations in close intervals along a longitudinal gradient from inflow to dam in a drinking water reservoir in Brazil. The method is suitable for parameters directly influencing the reflection properties of the water body (e.g. suspended solids (R²cal = 0.93), chlorophyll-a (R²cal = 0.74)), or for parameters closely related to those (e.g. total phosphorus (R²cal = 0.97)). For chemical oxygen demand, the method is not well suited (R²cal = 0.14, R²val = 0.45). Once calibrated to the local conditions, the spectrometer can be used stationary or on moving platforms to map and monitor surface waters. The integration of the procedure into acoustic and imaging techniques is further investigated.

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