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Advancing ecohydrology in the 21st century: A convergence of opportunities

Guswa, Andrew J. (author), Tetzlaff, Doerthe (author), Selker, John S. (author), Carlyle-Moses, Darryl E. (author), Boyer, Elizabeth W. (author), Bruen, Michael (author), Cayuela, Carles (author), Creed, Irena F. (author), van de Giesen, N.C. (author), Grasso, Domenico (author)

Nature-based solutions for water-resource challenges require advances in the science of ecohydrology. Current understanding is limited by a shortage of observations and theories that can further our capability to synthesize complex processes across scales ranging from submillimetres to tens of kilometres. Recent developments in environmental...

review 2020

document

Revisiting wind speed measurements using actively heated fiber optics: A wind tunnel study

van Ramshorst, Justus G.V. (author), Coenders-Gerrits, Miriam (author), Schilperoort, B. (author), van de Wiel, B.J.H. (author), Izett, J.G. (author), Selker, J.S. (author), Higgins, Chad W. (author), Savenije, Hubert (author), van de Giesen, N.C. (author)

Near-surface wind speed is typically only measured by point observations. The actively heated fiber-optic (AHFO) technique, however, has the potential to provide high-resolution distributed observations of wind speeds, allowing for better spatial characterization of fine-scale processes. Before AHFO can be widely used, its performance needs...

journal article 2020

document

Measurements and Observations in the XXI century (MOXXI): innovation and multi-disciplinarity to sense the hydrological cycle

Tauro, Flavia (author), Selker, J.S. (author), van de Giesen, N.C. (author), Abrate, Tommaso (author), Uijlenhoet, R. (author), Porfiri, Maurizio (author), Manfreda, Salvatore (author), Caylor, Kelly (author), Moramarco, Tommaso (author), Benveniste, Jerome (author), Ciraolo, Giuseppe (author), Estes, Lyndon (author), Domeneghetti, Alessio (author), Perks, Matthew T. (author), Corbari, Chiara (author), Rabiei, Ehsan (author), Ravazzani, Giovanni (author), Bogena, Heye (author), Harfouche, Antoine (author), Brocca, Luca (author), Maltese, Antonino (author), Wickert, Andy (author), Tarpanelli, Angelica (author), Good, Stephen (author), Lopez Alcala, Jose Manuel (author), Petroselli, Andrea (author), Cudennec, Christophe (author), Blume, Theresa (author), Hut, R.W. (author), Grimaldi, Salvatore (author)

To promote the advancement of novel observation techniques that may lead to new sources of information to help better understand the hydrological cycle, the International Association of Hydrological Sciences (IAHS) established the Measurements and Observations in the XXI century (MOXXI) Working Group in July 2013. The group comprises a...

journal article 2018

document

Tree Sway Time Series of 7 Amazon Tree Species (July 2015–May 2016)

van Emmerik, T.H.M. (author), Steele-Dunne, S.C. (author), Guerin, Marceau (author), Gentine, Pierre (author), Oliveira, Rafael (author), Hut, R.W. (author), Selker, John (author), Wagner, Jim (author), van de Giesen, N.C. (author)

journal article 2018

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The smart climate observation network that covers all Africa

Selker, J.S. (author), van de Giesen, N.C. (author), Annor, F.O. (author)

There is a lack of weather and climate observation stations in Africa, while food production, harvest predictions, and disaster mitigation would benefit from improved data-accessible observation. A new smart and sustainable weather and climate observation network now addresses the important challenge of monitoring the weather in the continent.

journal article 2018

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Skin effect of fresh water measured using distributed temperature sensing

Solcerova, A. (author), van Emmerik, T.H.M. (author), van de Ven, F.H.M. (author), Selker, J.S. (author), van de Giesen, N.C. (author)

A phenomenon known as the skin effect-a layer of surface water that is colder than the water beneath it-was previously described in oceanography and verified in lab measurements. Only a few measurements have been done on the skin effect in field conditions, and therefore this phenomenon is relatively unknown. This paper presents measurements...

journal article 2018

document

Validation of IMERG precipitation in Africa

Dezfuli, Amin K. (author), Ichoku, Charles M. (author), Huffman, George J. (author), Mohr, Karen I. (author), Selker, John S. (author), van de Giesen, N.C. (author), Hochreutener, Rebecca (author), Annor, F.O. (author)

Understanding of hydroclimatic processes in Africa has been hindered by the lack of in situ precipitation measurements. Satellite-based observations, in particular, the TRMM Multisatellite Precipitation Analysis (TMPA) have been pivotal to filling this void. The recently released Integrated Multisatellite Retrievals for GPM (IMERG) project...

journal article 2017

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Measuring Tree Properties and Responses Using Low-Cost Accelerometers

van Emmerik, T.H.M. (author), Steele-Dunne, S.C. (author), Hut, R.W. (author), Gentine, Pierre (author), Guerin, Marceau (author), Oliveira, Rafael (author), Wagner, Jim (author), Selker, John (author), van de Giesen, N.C. (author)

Trees play a crucial role in the water, carbon and nitrogen cycle on local, regional and global scales. Understanding the exchange of momentum, heat, water, and CO 2 between trees and the atmosphere is important to assess the impact of drought, deforestation and climate change. Unfortunately, ground measurements of tree properties such as mass...

journal article 2017

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Mapping high-resolution soil moisture and properties using distributed temperature sensing data and an adaptive particle batch smoother

Dong, J. (author), Steele-Dunne, S.C. (author), Ochsner, Tyson E. (author), Hatch, Christine E. (author), Sayde, Chadi (author), Selker, J.S. (author), Tyler, Scott (author), Cosh, Michael H. (author), van de Giesen, N.C. (author)

This study demonstrated a new method for mapping high-resolution (spatial: 1 m, and temporal: 1 h) soil moisture by assimilating distributed temperature sensing (DTS) observed soil temperatures at intermediate scales. In order to provide robust soil moisture and property estimates, we first proposed an adaptive particle batch smoother...

journal article 2016

document

Practical considerations for enhanced-resolution coil-wrapped distributed temperature sensing

Hilgersom, K.P. (author), van Emmerik, T.H.M. (author), Solcerova, A. (author), Berghuijs, W.R. (author), Selker, John (author), van de Giesen, N.C. (author)

Fibre optic distributed temperature sensing (DTS) is widely applied in Earth sciences. Many applications require a spatial resolution higher than that provided by the DTS instrument. Measurements at these higher resolutions can be achieved with a fibre optic cable helically wrapped on a cylinder. The effect of the probe construction, such as its...

journal article 2016

document

Practical considerations for enhanced-resolution coil-wrapped Distributed Temperature Sensing (discussion)

Hilgersom, K.P. (author), Van Emmerik, T.H.M. (author), Solcerova, A. (author), Berghuijs, W.R. (author), Selker, J.S. (author), Van de Giesen, N.C. (author)

Fibre optic Distributed Temperature Sensing (DTS) is widely applied in earth sciences. Many applications require a spatial resolution higher than the provided by the DTS instrument. Measurements at these higher resolutions can be achieved with a fibre optic cable helically wrapped on a cylinder. The effect of the probe construction, such as its...

journal article 2016

document

Mapping variability of soil water content and flux across 1–1000 m scales using the Actively Heated Fiber Optic method

Sayde, C. (author), Buelga, J.B. (author), Rodriguez-Sinobas, L. (author), El Khoury, L. (author), English, M. (author), Van de Giesen, N.C. (author), Selker, J.S. (author)

The Actively Heated Fiber Optic (AHFO) method is shown to be capable of measuring soil water content several times per hour at 0.25 m spacing along cables of multiple kilometers in length. AHFO is based on distributed temperature sensing (DTS) observation of the heating and cooling of a buried fiber-optic cable resulting from an electrical...

journal article 2014

document

Comment on ‘‘Capabilities and limitations of tracing spatial temperature patterns by fiber-optic distributed temperature sensing’’ by Liliana Rose et al.

Selker, J.S. (author), Tyler, S. (author), Van de Giesen, N.C. (author)

journal article 2014

document

The Trans-African Hydro-Meteorological Observatory (TAHMO)

Van de Giesen, N.C. (author), Hut, R.W. (author), Selker, J. (author)

In this opinion article, we present the Trans-African Hydro-Meteorological Observatory (TAHMO). The goal of TAHMO is to develop a dense network of hydro-meteorological measurement stations throughout sub-Saharan Africa. On average, there will be one station per 1000 km2. The stations will be cost-effective through the use of new sensor and...

journal article 2014

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Measuring vegetation water content by looking at trees blowing in the wind

Kooreman, B.D. (author), Hut, R.W. (author), Van de Giesen, N.C. (author), Selker, J. (author), Dunne, S.C. (author)

Abstract.

journal article 2013

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The trans-african hydro-meteorological observatory: Early results from the crowd sourcing competition

Van de Giesen, N.C. (author), Hilkhuijsen, T.M. (author), Hut, R.W. (author), Andreini, M. (author), Selker, J. (author)

Abstract.

journal article 2013

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A resonating rainfall and evaporation recorder

Stewart, R.D. (author), Hut, R.W. (author), Rupp, D.E. (author), Gupta, H. (author), Selker, J.S. (author)

We propose a novel, accurate quantification of precipitation and evaporation, as needed to understand fundamental hydrologic processes. Our system uses a collection vessel placed on top of a slender rod that is securely fixed at its base. As the vessel is deflected, either by manual perturbation or ambient forcing (for example, wind), its...

journal article 2012

document

Double-ended calibration of fiber-optic Raman spectra distributed temperature sensing data

Van de Giesen, N.C. (author), Steele-Dunn, S.C. (author), Jansen, J. (author), Hoes, O.A.C. (author), Hausner, M.B. (author), Tyler, S. (author), Selker, J. (author)

Over the past five years, Distributed Temperature Sensing (DTS) along fiber optic cables using Raman backscattering has become an important tool in the environmental sciences. Many environmental applications of DTS demand very accurate temperature measurements, with typical RMSE < 0.1 K. The aim of this paper is to describe and clarify the...

journal article 2012

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Carbon monoxide as a tracer of gas transport in snow and other natural porous media

Huwald, H. (author), Selker, J.S. (author), Tyler, S.W. (author), Calaf, M. (author), Van de Giesen, N.C. (author), Parlange, M.B. (author)

The movement of air in natural porous media is complex and challenging to measure. Yet gas transport has important implications, for instance, for the evolution of the seasonal snow cover and for water vapor transport in soil. A novel in situmulti-sensor measurement system providing high-resolution observation of gas transport in snow is...

journal article 2012

document

Calibrating single-ended fiber-optic raman spectra distributed temperature sensing data

Hausner, M.B. (author), Suarez, F. (author), Glander, K.E. (author), Van de Giesen, N.C. (author), Selker, J.S. (author), Tyler, S.W. (author)

Hydrologic research is a very demanding application of fiber-optic distributed temperature sensing (DTS) in terms of precision, accuracy and calibration. The physics behind the most frequently used DTS instruments are considered as they apply to four calibration methods for single-ended DTS installations. The new methods presented are more...

journal article 2011