Dear Rosa Romero

If I understand correctly, you can read this paper. I think it is useful

Article Remote Sensing Techniques to Assess Water Quality

Ecological Water Quality model is of one several models, which uses the active and passive (remote sensing) instruments for the retrieval of water quality. Such models often require calibration and validation.

Years ago, I had good results with In-situ sonde, Aquatrol, used to document salinity intrusion and tidal-freshwater water level changes in a USFS Wilderness Area (Wambaw Creek). They can be customized but sure have gone up in price. You might contact company to see if they still have refurbished models or rental units if on a budget or temporary need. Sondes do require calibration checks against standards or water level staff gauge for depth when servicing. Might be especially useful if using a boat with GPS and lower sonde to various depths when taking timed samples during lake transects. The unvented model requires barometric adjustment to compensate for pressure changes When taking depth measurements.

https://in-situ.com

Six main public domain water quality models which are presently available for Rivers and streams are being captured in this article. These main models could produce important results if they are used in the correct manner, because they are different in terms of assumptions, strength and weaknesses, processes they represent, modeling capability and data input requirements. The Model review discussed includes, water quality analysis simulation program (WASP7), simulation catchment (SIMCAT), quality simulation along Rivers (QUASAR), and the temporal overall model for catchment (TOMCAT), QUAL2KW, QUAL2EU. The models are described individually according to a consistent set of criteria-conceptualization, model capability, model strengths, limitations, input data and how it utilized. The outcome showed that TOMCAT and SIMCAT are important in ASSESSING effect of point sources in a very simple way. The QUAL2KW, unlike the QUAL2EU where macrophytes play a major interaction, it can convert algal death to carbonaceous Biochemical Oxygen Demand (CBOD), thereby making it more suitable. In addition to the extensive requirement of data, it is expensive and time consuming to set up these complex models such as QUASAR and WASP7. Therefore, one model cannot be used for all the required functionalities. Choosing a model would depend on a specific application, financial cost and time availability. This article may be of help in choosing a suitable model for a specific water quality problem.

Article Water Quality Model for Streams: A Review