Estimativa de volume de reservatório de água com software livre

Abstract

Em projetos de navegação, construção de portos, reservatórios e barragens faz-se necessário o conhecimento da profundidade e volume de um corpo hídrico, como uma seção de um rio ou um reservatório de água, visto que para que a circulação dos navios requer profundidades suficientes e em barragens com finalidade de captação de água o volume é essencial para gestão e planejamento do abastecimento das atividades dependentes da captação. Para o tal utiliza-se de métodos de obtenção de valores de profundidade, chamados levantamentos batimétricos. Este trabalho tem por objetivo comparar dois tipos de interpolação de dados batimétricos para obtenção de volume de reservatório através de software livre, ou seja, de forma acessível financeiramente e prática. Foi feito um trabalho de campo, com protótipo de barco autônomo construído pelos autores acoplado com ecobatímetro de forma a obter os dados de profundidade ao longo das seções de uma piscina semiolímpica. Com os valores de profundidade levantados, utilizou-se de duas formas de interpolação e os volumes obtidos foram comparados com o calculado pela medição em régua e trena do reservatório de geometria bem definida, uma piscina. Observou-se que a interpolação IDW teve melhor distribuição e uma diferença de apenas 6,24 m³ do volume calculado (1,30 % do volume total), dessa forma a mesma pode ser utilizada como modelagem de reservatórios para fins de outorga, gestão hídrica e projetos executivos de construção de barragens ou portos. Water reservoir volume estimation with free software through data obtained with remotely-operated ships A B S T R A C TOn navigation, ports and reservoirs projects, knowledge of the depth and volume of a water stream, like sections of a river or a reservoir, for instance, is necessary since it’s essential to have minimum depth for navigation and volume’s management for water distribution in dams or reservoirs. Bathymetric surveys are commonly used as a methodology to extract data on the depth of these streams. The objective of this study is to present a technique to calculate the volume of water reservoirs using an open software by comparing two kinds of interpolation of bathymetric data and depth data measured with a measuring tape. There was a field survey with an autonomous boat prototype attached with an echo sounder so that it could be possible to extract depth data throughout the sections of the reservoir. As a result of two interpolation methodologies, TIN and IDW, the processed data was compared with the volume calculated on the field for a well-shaped reservoir, in this case a pool. It was observed that the IDW interpolation presented a better distribution and a slight difference of 6,24 m³ from the measured volume, therefore it can be used for modeling reservoirs in order to obtain licenses, hydrologic management, and dams or port projects.Keywords: bathymetry; depth; interpolation; free software.

EVALUASI FUNGSI LINGKUNGAN EMBUNG BERBASIS SISTEM INFORMASI GEOGRAFI: KASUS EMBUNG KRAPYAK DAN TONOGORO DI KULON PROGO, DAERAH ISTIMEWA YOGYAKARTA (Environment Role Evaluation of Retention Basins Using Geographic Information Systems: Case of Krapyak and Tonogoro in Kulon Progo, Special Region of Yogyakarta)

“…Kumpulan titik data (X, Y, Z) dilakukan interpolasi untuk membuat DEM. Interpolasi yang digunakan dalam penelitian ini adalah Triangulation Irregular Network (TIN) (Ibrahim et al, 2022), Ordinary Kriging (Thanh et al, 2020), dan Inverse Distance Weighting (IDW) (Marques et al, 2021).…”

Comparative Analysis for Volume Estimation in Small Dams Using Conventional Bathymetry and Remote Sensing

“…Within the scope of water management, the precise determination of the volume of water retained in dams is a critical aspect, directly influencing decisions related to the responsible use of these resources since, in regions where water availability is very variable during the year, these small dams are essential structures to make irrigation viable and, consequently, maintain the quality of life of people in rural areas (Rodrigues et al, 2012;Andrade et al, 2020;Marques et al, 2021).…”

“…Furthermore, integrating Geographic Information Systems (GIS) and hydrological modeling enables more integrated and data-based management, facilitating informed decisionmaking and the implementation of climate change adaptation strategies. Ultimately, effective water resources management requires a holistic and collaborative approach, involving multiple stakeholders and adopting proactive measures to ensure the long-term sustainability of freshwater systems (Andrade et al, 2020;Marques et al, 2021;Andrade et al, 2022).…”

“…Using satellite images and remote sensors enables a quick and comprehensive assessment, overcoming some logistical limitations of conventional bathymetry. The spatial and temporal resolution of these technologies provides a holistic view of water behavior, expanding monitoring possibilities at different temporal and spatial scales (Rodrigues et al, 2012;Ferreira et al, 2016;Ferreira et al, 2019;Andrade et al, 2020;Caballero et al, 2020;Mateo-Perez et al, 2020;Marques et al, 2021;Andrade et al, 2022).…”