This paper presents the Squirtle, an Autonomous Surface Vehicle (ASV) for autonomous navigation and capable of manoeuvring in tight river environments. Its main features include precise localization with RTKGPS and inertial sensors, high manoeuvrability and autonomy, depth sensing and obstacle detection. Its purpose is the exploration and mapping of the bottom of rivers and of their shores. The...

In recent years, inland navigation networks benefit from the innovation of the instrumentation and SCADA systems. These data acquisition and control systems lead to a reactive asset-management of inland navigation networks. However, sensors and actuators are subject to faults due to the strong effects of the environment, aging, etc. In this paper, a sensor Fault Detection and Isolation (FDI) ap...

Water is the most vital resource for the living beings to survive. India has a vast and varied inland water resource which is considered to be richest in world’s nature lakes. The physicochemical characteristic of Nellore tank has been studied for monsoon, pre-monsoon, postmonsoon in the year. From the results water body was found to be well in the permissible limit of BIS (1998, except pH, DO,...

The altimeter emits a radar pulse, which is reflected at the nadir-surface and measures the two-way travel time, as well as the returned energy as a function of time, resulting in a return waveform. Over the open ocean the waveform shape corresponds to a theoretical model which can be used to infer information on range corrections, significant wave height or wind speed. However, the waveforms o...

Chlorophyll-a (chl-a) levels in lake water could indicate the presence of cyanobacteria, which can be a concern for public health due to their potential to produce toxins. Monitoring of chl-a has been an important practice in aquatic systems, especially in those used for human services, as they imply an increased risk of exposure. Remote sensing technology is being increasingly used to monitor ...

Mercury contamination in water has been an issue to the environment and human health. In this article, mercury in marine and oceanic waters has been reviewed. In the aquatic environment, mercury occurs in many forms, which depend on the oxidation-reduction conditions. These forms have been briefly described in this article. Mercury concentrations in marine waters in the different parts of the w...