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Questions related from Clinton Rissmann
Some research has suggested that compound specific fatty acids may be used as tracers of soil erosion. My question is whether or not different plant species generate fatty acids with different...
22 March 2023 951 4 View
Hi All, I wondered if anyone knows of published examples of the denitrification capacity (e.g., weakly reducing aquifers) of an aquifer being overwhelmed? I thought that weakly buffered (e.g.,...
08 September 2022 3,273 2 View
I'm interested to know if there have been any quantitative or semi-quantitative studies of geological diversity (complexity) between different countries? For example, New Zealand, Japan, Taiwan...
07 November 2021 9,556 2 View
I have been using Aabel (Gigawhiz) plotting and statistical software. However, it is Mac OS centric and cannot be installed on a PC. I like this software because it enables me to directly select a...
20 June 2020 3,756 4 View
We are attempting to generate a landscape classification of a large area using remote sensing data with a 20 x 20 m cell size and an area of 200,000 km2. We have 8 different rasters and want to...
13 February 2020 4,662 4 View
I'm working with a significant number of rasters (.tiff) as part of a landscape classification exercise. First I want to generate a dendrogram from the rasters (maximum of 7 different rasters) to...
26 January 2020 7,562 3 View
I'm wanting to build a library of daily precipitation rasters for NZ. Yes, 3650 rasters! Any guidance would be great. Thanks in advance.
10 January 2020 5,318 4 View
I'm applying airborne gamma ray spectroscopy to the mapping of wetlands and hydric soils. In terms of gamma rays emanating from the upper 300 mm - 1000 mm of the earth's surface the electron...
28 May 2019 2,466 1 View
We have generated a predictive model of soil geochemical variation. The model utilises a training data set of soil geochemical variation and rasters of environmental covariates such as radiometric...
07 February 2019 495 0 View
We are using multiple raster layers to produce a predictive classification of the landscape. Statistical modelling indicates that some of the layers we are using for the classification are more...
31 January 2019 5,284 1 View
I have been experimenting with the application of fuzzy logic to separate stream flow hydrographs using time series water quality data. I have found it useful but was wondering if their is any...
06 June 2018 5,044 4 View
Airborne geophysical surveys collect positional data. Can this positional data be used to build digital elevation models (DEM)? Specifically, I have access to regional airborne aeromagnetics and...
20 March 2018 8,119 12 View
Is there an R-script or equivalent open source code that automates identification of equations of fit for X vs Y data? I have a software package that identifies and ranks the equation(s) of best...
15 January 2018 7,081 7 View
I'm doing some work on hydrograph separation using hydrochemical measures. Throughout the literature workers refer to the need to use so called 'conservative tracers' for hydrograph separation....
09 January 2018 9,653 4 View
We are interested in finding a reagent for testing, in situ, the presence or otherwise of reduced iron (FeII) in soil profiles or core. I have heard of Childs reagent being used for this purpose...
28 September 2017 2,195 1 View
Dear Colleagues, I'm trying to better understand why we continue to invest in poorly constrained and often highly uncertain empirical models for estimating farm scale and catchment scale water...
22 July 2017 9,171 6 View
Groundwater baseflow to streams is often detected at low flows through measurement of radon concentrations. However, I note that a number of aquifers have potentially low uranium contents...
06 January 2017 8,458 3 View
Hi hoping for people’s thoughts/comments on the generalised relationship between soil horizons (sensu lato soil depth) and the concentration of exchangeable bases as well as the regulation of...
26 April 2015 2,754 8 View
I have a large data set of simultaneous CO2 and CH4 soil efflux data from across the surface of an active landfill. Data was collected using a West Systems Accumulation Chamber and infrared gas...
25 May 2014 9,643 2 View
I’m hoping to simulate the role of air temperature and barometric pressure over landfill gas efflux and was wondering if anyone had information on landfill gas pressure gradients? The choice of...
25 May 2014 4,379 0 View
Many papers on soil gas fluxes use parametric tests, after log transformation, to assess the significance of temporally discrete data sets (see Giammanco et al., 2010). My question is: “why is...
26 April 2014 3,687 6 View
Can anyone provide a technical explanation for why the uncertainties calculated by SGS (500 realisations) are often smaller than those determined by applying 95% confidence intervals to outputs...
21 December 2013 3,294 1 View
Soils vary in their drainage status. Soil drainage status is a key control over redox and hydrological response. Can anyone explain why some soils evolve towards being poorly drained and others...
01 January 1970 7,928 8 View
