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In order to accurately measure the reservoir capacity after siltation, this paper uses the ground 3D laser scanning system to obtain the topography above the water surface and the unmanned ship sounding system to obtain the topography below the water surface. then carry out the accurate review of the reservoir capacity through the combination model...
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New methods allow the direct computation of flood inundation maps from lidar data, independently of discharge estimates, hydraulic analysis, or defined cross sections. One method projects the interpolated profile of measured flood levels onto surrounding topography, creating a smooth inundation surface that is entirely based on data and geometrical...
Citations
... Much of the current literature on landfills is mostly groundwater and soil only. This study uses technologies such as unmanned vessels and monitoring well imaging techniques to capture the amount and distribution of contaminated media visually, finely, and accurately [36][37][38], and adds sediment investigation and sample collection to fill the gap in the sediment investigation work in damage identification and assessment work [39]. ...
... The water depth measurement device is completed by the digital dual-frequency depth sounder on board, which mainly uses ultrasonic waves to penetrate the medium and produce emission on the surface of different media, emits ultrasonic waves through the transducer, and measures the time difference between the emitted and reflected waves to measure the water depth [40]. The attitude sensor of the hull is used to correct the collected bathymetry data, eliminating the problem that the oscillation of the hull caused by wind and current during the measurement process makes the bathymetry data collected by the transducer mismatch with the GPS receiver plane data, ensuring that the measurement data is true and reliable [36,41]. The parameters of the unmanned vessel equipment are shown in Table 2. ...
Landfills are a potential source of local environmental pollution of all kinds, and the gradual destruction of seepage-proof structures in informal landfills will lead to contamination of the surrounding soil and groundwater environment. In this study, an informal landfill site in eastern China is used as the research object. Using technologies such as unmanned vessels and monitoring well imaging to delineate the amount and distribution of polluting media, sampling of the surrounding soil, sediment, groundwater, and surface water for testing, analysis, and evaluation is carried out visually and finely for heavy metals, petroleum hydrocarbons, volatile organic compounds (VOCs), semi-volatile organic compounds (SVOCs), and other indicators. The test results show that volatile phenols are the main contaminant species in the shallow groundwater, chlorinated hydrocarbons and benzene were prevalent in the deep groundwater, hexachlorobenzene and lead in the surface soil, and di(2-Ethylhexyl) phthalate in the deep soil (5.5 m), with a maximum exceedance of 1.24 times. Nearly 10 years have passed since the waste dumping incident at the landfill, but characteristic contaminants are still detected in the topsoil of the dumping area, which shows the long-term nature of the environmental impact of illegal dumping on the site. The study recommends that when developing a comprehensive remediation plan, the persistence of the environmental impact of the waste should be considered and appropriate remediation measures should be screened.
