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Storm Watch over USA with Stream Flood Status

Below you should see interactive map with active hurricane tracking over USA (Atlantic and Pacific). Also Weather Radar with current precipitation, next several days flooding outlook areas. Different color square markers indicate major river flood status with links to USGS site showing up-to-date water level and projected flooding. Purple squares - major flooding on-going. To see legend and toggle layers click on >> in top left corner.

Sign up for webinar "Application of Geophysical Methods to Agriculture: Methods Employed"

Dr. Larisa Golovko (President of Landviser, LLC) will be presenting "Geophysical Methods of Electrical Resistivity and Self-Potential in Agriculture" in first of 

 

 

Agricultural Geophysics Webinar Series: "Application of Geophysical Methods to Agriculture: Methods Employed"

A live webinar on the application of geophysics to agriculture will be offered on:

Tuesday, February 18, 2014, from 3pm - 4:30pm EST
(2:00 - 3:30 CST, 1:00 - 2:30 MST, 12:00 - 1:30 PST)

This first in a series of agricultural geophysics webinars will focus on the near-surface geophysical methods presently being used for agricultural purposes, which include resistivity, self-potential, electromagnetic induction, ground penetrating radar, dielectric sensors, VIS/NIR/MIR spectrometry, gamma ray spectrometry, mechanical soil compaction sensors, and ion selective potentiometry. Five presenters will provide a short overview of agricultural geophysical methods during the first 30 minutes of the webinar. The last hour of the webinar will be devoted to a panel discussion with the presenters, who will answer questions from the audience.

Местоположение

28° 8' 11.7564" N, 90° 50' 5.8596" W

Зависимости УЭС от почвенных свойств – параметров окультуренности

Для более корректного и строго обоснованного применения электрических параметров для оценки степени окультуренности  необходимо выяснить зависимости между ними и базовыми свойствами почв характеризующими степень окультуренности. Среди них наиболее важными представляются грансостав (физглина - частицы меньше 0,01 мм), характеризущий физическое состояние почв: гумус, характеризующий плодородие  (С%) и емкость катионного обмена (ЕКО мг-экв./100г).

В первую очередь при анализе  зависимостей, конечно, встает вопрос выбора вида зависимости.

Электрическое сопротивление как показатель степени окультуренности

Электрическое сопротивление измерялось по профилю всех изученных разрезов (рис. 4). Измерения показали, что величины электрического сопротивления неокультуренных, или целинных (разрез №1) и окультуренных (разрез №4 и №5) почв сильно разнятся. Также по данным кривым прослеживается дифференциация профиля почв, что в целом подтверждается морфологическим строением почвы. Особо следует отметить, что для поверхностных (до глубины 10 см) пахотных горизонтов  агропочв, подверженных ежегодной систематической обработке, выявляется заметная дифференциация величин электрического сопротивления.

Результаты и обсуждение

Сравнительное изучение морфологического описания разрезов, сделанных на ключевых участках разного временного интервала освоения – контрольный  объект (0 лет) – производственный пахотный массив (60 лет) – почвы поселений (>100 лет) выявило влияние степени окультуренности почвы на строение ее профиля. Прежде всего, следует отметить маломощность гумусового горизонта естественных почв (разрез №1). При увеличении возраста освоения 0-60-100 лет выявлено заметное увеличение суммарной мощности гумусовых горизонтов – 15-35-44 см соответственно (рис. 2).

Введение

Длительное использование почв как средства сельскохозяйственного производства приводит к изменениям природных процессов почвообразования и свойств почв, т.е. к формированию новых культурных почв.

Можно полагать, что процесс изменения природных свойств почвы с целью создания и постоянного поддержания высокого уровня плодородия под воздействием производственной деятельности человека, называется окультуриванием почвы.

Evaluating cultivation level of sandy soils in European Russia with electro-geophysical methods

Electrical resistivity vs cultivation degree of sandy soils Update: Full PDF of the paper is now available!

Electrical resistivity of cultivated sandy soils of humid areas is a complex characteristic based on three fundamental properties of soil matrix, such as soil texture, total organic matter (carbon content) and cation exchange capacity (CEC). Relationship of electrical resistivity (ER) with those properties has been approximated with exponential equation ER=a*exp(-b*x), where x is any of the properties above. The correlation coefficients for ER as function of CEC, texture, or organic matter were between 0.82 and 0.91 for the soils of Klin-Dmitrov watershed near Moscow and Kirov, which suggests their applicability for other humid areas. We present a new approach to approximate exponential relationship ER=a*exp(b*x) with a linear “piece-wise” function based on the age of cultivation for each field.This approach was used to develop management zones based on ER to separate uniform areas of similar organic matter, CEC and clay content. Those basic properties are the foundation of soil fertility in humid areas. They influence biomass and bioactivity of soil microorganisms, thus the exponential relationship between ER and soil microorganisms was also observed. The approach based of electrical resistivity or conductivity was used to evaluate fertility and degree of cultivation of sandy soils in humid areas and for detail soil mapping and delineation of management zones in adaptive precision agriculture. The field and laboratory electrical geophysical methods are recommended for quick and accurate soil mapping and management in sustainable farming.

*at SAGEEP 2013, March 17-21 in Denver, CO, Larisa Golovko, Ph.D. will also present "Basic Theory of Measuring Electrical Resistivity, Conductivity and Self-Potential in Soils and Plants" with LandMapper ERM-02 and other commercially available geophysical equipment at post-conference workshop "Agricultural Geophysics: Theory and Methods".
SAGEEP 2013 logo
Cite this presentation as:

Anatoly Pozdnyakov, P.I. Eliseev, Larisa Golovko, Lev A. Pozdnyakov, Maria S. Dubrova, and E.P. Makarova. “Evaluating Cultivation Level of Sandy Soils in European Russia with Electro-geophysical Methods.” In New Views of the Earth. Denver, CO: Environmental and Engineering Geophysical Society, 2013. http://www.eegs.org/AnnualMeetingSAGEEP/SAGEEP2013/SessionsAbstracts.aspx

 

Locations

Denver 39° 44' 15.2412" N, 104° 59' 4.9848" W
Klin, MOS 56° 19' 18.5304" N, 36° 42' 30.8772" E
KIR 58° 36' 16.8984" N, 49° 39' 58.5504" E

Low-cost GPS logger

I had tested a small gadget called GPS logger from Columbus Visiontac. Complete product name-description is:

Product name

Product Features

Where to buy

 

Columbus V-990 GPS Data Logger (microSD Slot, Voice Recording, 66 ch. MTK)

 

  • A good data logger still needs practical track processing software. Time Album attached to V-990 can help you freely process track.Time Album has various personalized settings.
  • It can export track according to distance or time, select metric or imperial unit or record intervals, and support various operating systems including WINDOWS, MAC OS and LINUX.
  • V-990 adopts the currently most advanced and stable MTKII 3329 super single chip, with only 35s and 1s required respectively for cold start and warm start.
  • It can realize rapid and stable positioning under various environments including urban district and suburb.
  • The built-in high-capacity Li-polymer battery can allow you to use the device all day (24hrs).

Columbus V-900 Bluetooth GPS Data Logger (microSD , Voice Tag for POI, Driverless, Push to Log, 25 millions waypoints*, XP / Vista/ Linux / Mac OSX Compatible)

  • 51 channels MTK chipset with enhanced positioning system technology (up to 1.5m accuracy with EPS Technology
  • Voice-Tag function with built-in microphone allows adding live voice labels to any waypoint
  • MicroSD Slot with support up to 2GB* capacity (about 25,000,000 waypoints, more than 2 years) *NOTE: 1GB microSD card is optional in the package
  • Push-To-Log (POI anchor key) enables you to mark a POI at any time
  • Unique SPY mode allows continuous standby logging of more than one month

Locations

Seatle 47° 36' 22.356" N, 122° 19' 55.4556" W
32° 19' 45.2136" N, 142° 1' 52.5" E

Seven-step approach for complete near-surface resistivity survey of farmland with LandMapper

Despite numerous EC-mapping case studies conducted in many countries, only a few studies have demonstrated a complex approach to electrical geophysical site survey. In most studies only one technique of EC-mapping, either EM, GPR or four-electrode method was employed. This is understandable since most commercially available EC/ER measuring equipment operate in limited range of resistivities and depths (1-2 manufacturer-set depths are typical).

Locations

Protvino, MOS
Russia
55° 44' 34.0548" N, 37° 36' 55.4436" E
United States
42° 52' 48.8676" N, 104° 45' 56.25" W

Quick Estimation of Salinity in Field Soils and Irrigation Water with LandMapper ERM-02

ec mapping with Landmapper on dead rice field after hurracaine IkeSoil salinity is routinely evaluated in the labs from electrical conductivity of liquid soil saturation extract (ECe). The resulted total salinity is reported either directly in conductivity units (dS/m) or converted to TDS (total dissolved solids) concentration in ppm (parts per million) using formula: 1 dS/m = 1 mS/cm = 1 mmho/cm = 640 ppm = 640 mg/L= 0.64 g/L=0.064%

But now EC of soil and waters can be measured directly in the field using highly accurate method of four-electrode probe and Landmapper ERM-02 measuring device. Best of all, probes can be build to sense different soil layers down to 30 ft! Probes are simple and inexpensive to make from common materials available at any hardware store.

For irrigation water and soil solutions: To measure ECw just put 4-electrode probe of Landmapper used for mapping into a ditch, canal, or other water source. Make sure that all 4-electrodes are in contact with water. Take a reading in EC (conductivity) mode. Display will read (example):  
K0*C= 150m  - which indicates milli Siemens (mS/m)
To convert to dS/m, divide display number by 100, i.e. 150 mS/m=1.5 dS/m.
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