Mehrzad Shahidzadehasadi’s Post

#Caltech researchers have developed a new method to measure soil moisture in the shallow subterranean region between the surface and underground aquifers. This region, called the vadose zone, is crucial for plants and crops to obtain water through their roots. The new #method relies upon seismic technology that normally measures how the ground shakes during #earthquakes. However, it can also detect the vibrations of human activity, like traffic. As these #vibrations pass through the ground, they are slowed down by the presence of water—the more moisture, the slower the vibration moves. The new study measures the water content in the vadose zone through #seismic rumblings from everyday traffic. The new method is based on a technique pioneered in the Zhan lab, called distributed acoustic sensing (#DAS). With this technique, lasers are pointed into unused underground fiber-optic cables (like the kind that provides the internet). As a seismic wave, or any kind of #vibration, passes through the cable, the laser light bends and refracts. Measuring the wiggles in this laser light gives researchers information about the passing wave, making the 10-kilometer cable equivalent to a line of thousands of conventional seismic sensors. #DAS #DFOS #DFOST #DistributedAcousticSensing https://lnkd.in/g4kt2h5r

Glad to introduce #SHyTCWaves: a novel hybrid model designed to accurately predict spatial and temporal directional wave spectra induced by tropical cyclones 🌊🌪️ The metamodel is based on: (a) parameterization of more than 180,000 historical global 6-hour TC track segments; (b) MDA selection and numerically run of 2,000 cases with a third-generation spectral wave model covering the whole casuistic; (c) reconstruction of spatial and temporal fields of directional wave spectra for any tropical cyclone and validation with altimeter data 🌀 This model boasts exceptional computational efficiency and can be implemented globally for fast short-term forecast or probabilistic risk assessment 🌏   This is the fourth publication of the #HyPapers release, which all have in common the use of a hybrid downscaling approach 🌐 that combines mathematical algorithms and numerical modeling. If you missed the #HyWaves #HySwash and #HyTCWaves posts, explore our earlier publications to catch up! 🔍   Sara O. van Vloten | Laura Cagigal Gil | Beatriz Pérez Díaz | Ron Hoeke | Fernando J. Mendez GeoOcean   #GoHybrid #Tropical #Cyclones 🚀

River noise propagation revisited: Surface-, line- and point sources are assessed using a ray tracing calculation tool (Odeon v 18.13) and an improved spreadsheet model. The ray tracing geometry is simplified, looking at the first order effects and the impact of a barrier on the distance loss (DL) from a surface source. The DL is compared to measured data for a medium size river and a 89 m wide dam with 6 m fall, the largest water flow in the measured dataset (Q = 430 m3/s). A multiple regression formula on n = 267 measured data show a distance loss of abut 4,4 dB per doubling of distance r, which is in between line- and point source. With screening involved, the distance loss will increase. In general the noise level will drop faster from a river than e.g. trafficked road. The match between theory and measurements are not perfect. There is a discussion of the results and some assessments for further work at the end. This is a work in progress. https://lnkd.in/giPdCgGe #noise #river #fountain #surfacesource #linesource #ioa #acoustics #correlation #sound #waterfall #stream #statistics #patternrecognition #godtlydmiljø Brekke & Strand

🌐🛠️📊 𝑫𝒊𝒔𝒄𝒐𝒗𝒆𝒓 𝒕𝒉𝒆 𝑭𝒖𝒕𝒖𝒓𝒆 𝒐𝒇 𝑼𝒕𝒊𝒍𝒊𝒕𝒚 𝑳𝒐𝒄𝒂𝒕𝒊𝒏𝒈 𝒘𝒊𝒕𝒉 𝑴𝑨𝑳𝑨̊ 𝑬𝒂𝒔𝒚 𝑳𝒐𝒄𝒂𝒕𝒐𝒓 𝑾𝒊𝒅𝒆𝑹𝒂𝒏𝒈𝒆! 🌍🔍 Unleash the power of cutting-edge ground penetrating radar (GPR) technology! 🚀 Whether you’re a seasoned pro or just starting out, the WideRange system has you covered: * Ultra-Fast Data Acquisition: With the widest GPR antenna bandwidth, it delivers high-resolution results in a flash. * Adaptable Anywhere: Rough terrain? No problem! Pair it with the Rough Terrain Cart (RTC) for seamless operation. * Comprehensive Utility Detection: 🚧 Pipe Locating: Prevent excavation mishaps by pinpointing buried pipes. ⚡ Cable Locating: Keep services running smoothly by identifying underground cables. 🕳️ Void Detection: Ensure safety and precise construction planning. 🌿 Environmental Assessments: Conduct impact studies and remediation efforts. 🏗️ Construction Planning: Safeguard projects by locating all underground utilities. And guess what? These capabilities are powered by advanced AI algorithms! 🤖🔬 Upgrade your utility locating projects today! Contact GlobalGIS for details. 📞💡 070 - 332 1503 https://wa.me/94703321503 #UtilityLocating #GPR #MALÅTech #Innovation #Geophysics #PrecisionMapping #PipeLocating #CableLocating #ConstructionSafety #UrbanPlanning #Infrastructure #ClimateChangeAdaptation #globalgis

Interested in Hyperspectral Remote Sensing? We had a recent USGS webinar moderated by Amanda O’Connor, one of our own remote sensing experts! Please Check out the recording of "Remote Sensing of Surface Mineral Composition," and explore the latest in remote sensing tech with leaders in the field! 🛰️ https://bit.ly/460yWqW #ENVI #NV5Geospatial #APACGeospatial #SpectralAnalysis #RemoteSensing

Low‐Frequency Blast Detection Using a Large‐N Dark Fiber in Noisy Environments: Template Matching and Optimal Channel Selection #SRL Installed but inactive fiber-optic strands are called "dark fiber" and can be used for distributed acoustic sensing, or DAS. In a new study, a team from Rice University and Berkeley Lab explore the feasibility of using a dark‐fiber array in a noisy environment to detect small explosions. By comparing dark-fiber detection with nearby conventional seismometers, they found that a single station can outperform up to about ten DAS channels, but using the full aperture of the dark-fiber transect resulted in about 10% lower detection threshold and fewer false-positives than an array of four seismometers. https://lnkd.in/g76nNacG

Ground-penetrating radar (GPR) is not just for scientists anymore! This maturing technology is proving to be incredibly versatile, especially in places you might not expect—like cemeteries. https://bit.ly/3wxvx5Q #americancemeterycremation

I am thrilled to announce the publication of my first conference paper, 'Application of Delft3D FM Suite for Simulating the Hydrodynamic Characteristics of Karnafuli River,' in the proceedings of ICPACE 2023. #ICPACE2023 #Hydrodynamics #FirstConferencePaper #Delft3D #Delft3DFMSuite

🌐 Exciting EEMS Blog - Take a moment to read it! 😊⬇️ #EEMS #TimeSeriesCalibration #ModelingExcellence #EFDC #WaterQualityModeling #CyanobacteriaResearch #EnvironmentalScience #ModelingTechniques #EEModelingSystem #WaterEcosystems #EnvironmentalEngineering #AquaticEcology #ScienceInnovation #WaterManagement #EnvironmentalModeling #FluidDynamics #EcologicalResearch #WaterResearch

Thrilled to introduce #HyTCWaves: A Hybrid model for downscaling Tropical Cyclone induced extreme Waves 🌊 This surrogate model provides a useful approximation of spatial-based regional extreme value distribution induced by TCs 🌀 using long collections of high-fidelity tracks that reproduce similar historical diversity and frequency trends 🌪️ HyTCWaves was applied to the target location of Majuro atoll 🏝️ This is the third publication of the #HyPapers release, which all have in common the use of a hybrid downscaling approach 🌐 that combines mathematical algorithms and numerical modeling. If you missed the #HyWaves and #HySwash posts, explore our earlier publications to catch up! 🔍 Sara O. van Vloten | Laura Cagigal Gil | Ana Rueda | Nicolás Ripoll | Fernando J. Mendez GeoOcean #GoHybrid #Tropical #Cyclones 🚀🌏