We have developed a new data acquisition system and technique to measure the radio magnetotelluric (RMT) signals from distant radio transmitters with the objective of mapping and modeling electric resistivity structures below a river or lake. The acquisition system is towed by a boat; therefore, we call the technique boat-towed RMT. The data acquisition is fast with a production rate of approxi...

Radioactive elements occur naturally in the environment. A long-term exposure to the radioactive gas radon (Rn) can lead to lung cancer. In Sweden, 450 cases of lung cancer, mostly among smokers, are registered every year, due to inhalation of radon gas. The ultimate parent element of Rn is uranium (U), which is found in soil and bedrock in varying concentrations. U is also radioactive but caus...

Debris flow erosion into bedrock helps to set the pace of mountain denudation, but there are few empirical observations this process. We studied effects debris flows on using Structure-From-Motion photogrammetry and multiple real-time monitoring measurements. found that distribution across channel cross-section could be generalized as an exponentially decreasing function height above thalweg. U...

Abstract. We used numerical modelling to explore the role of vertical compartmentalization hillslopes on groundwater flow and recession discharge. found that, when hydraulic properties are vertically compartmentalized, streamflow behaviour may strongly deviate from what is predicted by theory that considers drainage shallow reservoirs with homogeneous properties. further identified hillslope co...

Borehole radar can be used in a single-hole reflection mode or in a cross-hole tomography mode. In the reflection mode, radar provides an image of discontinuities in the bedrock surrounding a borehole, including bedding planes, lithologic contacts, fractures, and cavities. The measurements are either directional or omnidirectional, depending upon the type of equipment and antennas. In the tomog...

Landslides associated with hillside cuttings in igneous rock saprolites are a serious natural hazard in Hong Kong and have been extensively studied by government agencies and local universities for many years from the perspective of soil and rock engineering. A review of the case studies for some major landslides, especially deep-seated landslides, shows certain puzzling features. First, a numb...

Allanite and epidote occur in the parent rocks of weathered regolith at the Coweeta Hydrologic Laborato~y in North Carolina and exhibit different responses to weathering. Petrographically, epidote and allanite are identical at Coweeta, and only with additional analytical techniques (e.g., EDS or LAICP-MS) can the two be distinguished. Allanite is more abundant in unweathered bedrock but weather...

[1] Data on channel geometry in naturally incising bedrock rivers reveal variable relationships between channel width, slope, and erosion rate. To explain the range of relationships between these parameters, we propose an optimized channel geometry model. The model reproduces previous theoretical and numerical modeling scaling relationships; however, to explain the field data, the model must in...