Two mathematical approaches to study the phosphorus eutrophication of a wetland in Puerto Rico

Introduction− Laguna Cartagena (LC), a wetland in Lajas, Puerto Rico, has been negatively impacted by nutrients, main-ly phosphorus run-off from agricultural activities until the end of sugar cane cultivation in the late 1900s. This led to P concentration remain high at hypereutrophic state that was irremediable even after a 5-fold reduction in source water nutrient concentration. Objective−The main goal of this research paper is to apply two different mathematical approaches to assess the eutrophi-cation level of a wetland in Puerto Rico. Methodology−Grey Cluster Method (GCM) was used to classify LC’s eutrophic state by applying the International and Chinese trophic standards and two parameters, Total Phosphorous (TP) and Total Nitrogen (TN). Mean TP and TN from LC consolidated bottom substrate and flocculence samples were used to classify LC. To address whether LC can recover, soluble reactive phosphorus (SRP) and TP from LC inlet, outlet, and center water samples were used to model (dif-ferential equation) the input and loss of phosphorus in LC and determine whether an equilibrium point exists. GCM analysis classified LC as a eutrophic wetland using the International standard and hypereutrophic using the chinese standard. Results− Trophic state classification did not vary with use of consolidated bottom substrate versus flocculence samples. The differential equation model showed that SRP and TP levels within LC were higher than levels of SRP and TP entering LC, which could be caused by a nutrient recycling process within LC that may predict failure of remediation efforts. An equilib-rium point was found at the eutrophic level, which means that even if there is a reduction in phosphorus input, there will not be a change in LC’s eutrophic state. Conclusions−Chinese trophic standard indicated LC was in a hypertrophic state. Similar results were found using the in-ternational standard. The differential equation model showed that LC is irreversible.

• Autores: Paredes, Marlio; Torres Velasquez, Brenda Carolina; Sanchez Colon, Yashira Marie; Schaffner, Fred
• Tipo de recurso: Article of journal
• Fecha de publicación: 2019
• Institución: Corporación Universidad de la Costa
• Repositorio: REDICUC - Repositorio CUC
• Idioma: eng
• OAI Identifier: oai:repositorio.cuc.edu.co:11323/5626
• Acceso en línea: https://hdl.handle.net/11323/5626; https://doi.org/10.17981/ingecuc.15.1.2019.06; https://repositorio.cuc.edu.co/
• Palabra clave: Phosphorus dynamics; Total phosphorus; Soluble reactive phosphorus; Total nitrogen; Equilibrium point; Eutrophication; Hypereutrophication; Grey cluster method; Método de agrupamiento de grises; Dinámica del fósforo; Fósforo total; Fósforo soluble reactivo; Nitrógeno total; Punto de equilibrio; Eutrofización; Hipereutrofización
• Rights: openAccess
• License: CC0 1.0 Universal