Remote sensing and GIS techniques for assessment of the soil water content in order to improve agricultural practice and reduce the negative impact on groundwater: case study, agricultural area Ştefan cel Mare, Călăraşi County

2012 ◽  
Vol 66 (3) ◽  
pp. 580-587 ◽  
Author(s):  
Giuliano Tevi ◽  
Anca Tevi

Traditional agricultural practices based on non-customized irrigation and soil fertilization are harmful for the environment, and may pose a risk for human health. By continuing the use of these practices, it is not possible to ensure effective land management, which might be acquired by using advanced satellite technology configured for modern agricultural development. The paper presents a methodology based on the correlation between remote sensing data and field observations, aiming to identify the key features and to establish an interpretation pattern for the inhomogeneity highlighted by the remote sensing data. Instead of using classical methods for the evaluation of land features (field analysis, measurements and mapping), the approach is to use high resolution multispectral and hyperspectral methods, in correlation with data processing and geographic information systems (GIS), in order to improve the agricultural practices and mitigate their environmental impact (soil and shallow aquifer).

Water ◽  
2016 ◽  
Vol 8 (6) ◽  
pp. 260 ◽  
Author(s):  
Murali Gumma ◽  
Birhanu Birhanu ◽  
Irshad Mohammed ◽  
Ramadjita Tabo ◽  
Anthony Whitbread

2010 ◽  
Vol 14 (9) ◽  
pp. 1731-1744 ◽  
Author(s):  
D. Courault ◽  
R. Hadria ◽  
F. Ruget ◽  
A. Olioso ◽  
B. Duchemin ◽  
...  

Abstract. The aim of this study is to propose methods to improve crop and water management in Mediterranean regions. At landscape scale, there is a spatial variability of agricultural practices, particularly for grasslands irrigated by flooding. These grasslands are harvested three times per year and produce high quality hay, but their productions decreased significantly during the last few years because of the water scarcity. It is therefore important to assess the real water requirement for crops in order to predict productions in the case of agricultural practice modifications. Until now, the spatial variability of agricultural practices was obtained through surveys from farmers, but this method was tedious to describe an entire region. Thus, the specific aim of the study is to develop and assess a new method based on a crop model for estimating water balance and crop yield constrained by products derived from optical remote sensing data with high spatio-temporal resolution. A methodology, based on the combined use of FORMOSAT-2 images and the STICS crop model, was developed to estimate production, evapotranspiration and drainage of irrigated grasslands in "the Crau" region in the South Eastern France. Numerous surveys and ground measurements were performed during an experiment conducted in 2006. Simple algorithms were developed to retrieve the dynamic of Leaf Area Index (LAI) for each plot and the main agricultural practices such as mowing and irrigation dates. These variables computed from remote sensing were then used to parameterize STICS, applied at region scale to estimate the spatial variability of water budget associated with the biomass productions. Results are displayed at the farm scale. Satisfactory results were obtained when compared to ground measurements. The method for the extrapolation to other regions or crops is discussed as regard to data available.


Author(s):  
А.В. Иванов ◽  
А.В. Стриженок ◽  
И.К. Супрун

В последние десятилетия наблюдается устойчивая тенденция к значительному увеличению объемов добычи и переработки минерального сырья, что, в свою очередь приводит к увеличению объемов промышленных отходов, преобладающим способом утилизации которых является наземное размещение в виде техногенных массивов. Такие техногенные массивы особенно сильно подвержены риску возникновения чрезвычайных ситуаций, которые могут повлечь за собой значительный социальный, экологический и экономический ущерб. В этой связи особую актуальность для общества, экономики и государства приобретает разработка и внедрение на территории воздействия хранилищ промышленных отходов систем экологического мониторинга, позволяющих оперативно выявлять источники техногенной нагрузки и осуществлять своевременную их ликвидацию. Одной из наиболее инновационных и развивающихся сфер экологического мониторинга на сегодняшний день является мониторинг состояния компонентов природной среды на основании данных дистанционного зондирования земли. На сегодняшний день мониторинг состояния природных объектов, подверженных негативному воздействию предприятий минерально-сырьевого комплекса, с использованием данных дистанционного зондирования земли представляет значительный практический и научный интерес. Все разнообразие приемов и способов дешифрирования космоснимков сводится к двум основным методам: визуальному и автоматизированному (компьютерному). Под визуальным дешифрированием понимается процесс, выполняемый оператором. В противоположность этому автоматизированное (компьютерное) дешифрирование это программная обработка снимков на компьютере при помощи специальных программ. Космическая съемка заняла прочное место в системе средств, применяемых при проведении мониторинга окружающей среды. Перечень тематических задач, решаемых по данным дистанционного зондирования Земли огромен, а мониторинг экологической ситуации территорий, подверженных негативному воздействию объектов минерально-сырьевого комплекса, на основании данных дистанционного зондирования Земли является перспективным и активно развивающимся методом экологического мониторинга. В данной работе представлены основные методы дешифрирования геоэкологических условий территорий горнопромышленных комплексов на основании данных дистанционного зондирования земли There are a steady tendency to significantly increase the volume of extraction and processing of mineral raw materials on our planet in recent decades. It leads to an increase in the volume of industrial waste, which predominant method of disposal is placement on the Earth surface in the form of anthropogenic arrays. Such anthropogenic arrays are especially subjecting to the risk of emergencies, which can entail significant social, environmental and economic damage. In this regard, the development and implementation of environmental monitoring systems on the territory of the impact of industrial waste storages, which can quickly identify sources of anthropogenic load and carry out their timely elimination, is of particular relevance to society, the economy and the state. Monitoring of the state of components of the environment based on remote sensing data is one of the most innovative and developing areas of environmental monitoring today. Today, monitoring the state of natural objects exposed to the negative impact of the enterprises of the mineral resource complex using data from remote sensing of the earth is of significant practical and scientific interest. The whole variety of techniques and methods for decoding satellite images is reduced to two main methods: visual and automated (computer). Visual decryption refers to the process performed by the operator. In contrast, automated decryption is the software processing of images on a computer using special programs. Space imagery has taken a strong place in the system of tools used in environmental monitoring. The list of thematic tasks to be solved according to the Earths remote sensing data is huge, and monitoring the environmental situation of territories exposed to the negative impact of the mineral resources complex, based on the Earths remote sensing data, is a promising and actively developing method of environmental monitoring. This paper presents the main methods of decoding of the geo-ecological conditions of territories of mining complexes based on the data of earth remote sensing.


2015 ◽  
Vol 3 (1) ◽  
pp. 497-533 ◽  
Author(s):  
A. M. Youssef ◽  
M. Al-Kathery ◽  
B. Pradhan

Abstract. Escarpment highways, roads and mountainous areas in Saudi Arabia are facing landslide hazards that are frequently occurring from time to time causing considerable damage to these areas. Shear escarpment highway is located in the north of the Abha city. It is the most important escarpment highway in the area, where all the light and heavy trucks and vehicle used it as the only corridor that connects the coastal areas in the western part of the Saudi Arabia with the Asir and Najran Regions. More than 10 000 heavy trucks and vehicles use this highway every day. In the upper portion of Tayyah valley of Shear escarpment highway, there are several landslide and erosion potential zones that affect the bridges between tunnel 7 and 8 along the Shear escarpment Highway. In this study, different types of landslides and erosion problems were considered to access their impacts on the upper Tayyah valley's bridge along Shear escarpment highway using remote sensing data and field investigation. These landslides and erosion problems have a negative impact on this section of the highway. Results indicate that the areas above the highway and bridge level between bridge 7 and 8 have different landslides including planar, circular, rockfall failures and debris flows. In addition, running water through the gullies cause different erosional (scour) features between and surrounding the bridge piles and culverts. A detailed landslides and erosion features map was created based on intensive field investigation (geological, geomorphological, and structural analysis), and interpretation of Landsat image 15 m and high resolution satellite image (QuickBird 0.61 m), shuttle radar topography mission (SRTM 90 m), geological and topographic maps. The landslides and erosion problems could exhibit serious problems that affect the stability of the bridge. Different mitigation and remediation strategies have been suggested to these critical sites to minimize and/or avoid these problems in the future.


Formulation of the problem. The Tatarbunars’kyi District is located in the southwestern part of Odessa region and reflects the main features of the landscape-economic structure of the region: water, agricultural, resort and environmental areas. On the other hand, the form of land use is characterized by widespread plowing of land with degradation and erosion of soil cover. Land structure and use patterns have a complex negative impact on ecological and economic processes and cannot ensure the sustainable development of the region, in particular it is antagonistic to the unique transitional wetland ecosystems of international importance located within the area. To solve the issues of balanced environmental management and zoning of the landscape and economic structure of the region, Earth remote sensing (ERS) data can be used - spectrozonal satellite imagery and geographic information systems (GIS), which can simultaneously cover the research area as a whole, carry out regular monitoring and significantly reduce costs by expensive expeditionary work. Using space monitoring data allows you to get a large array of characteristics of the state of the territorial complexes of the region. Purpose of the work is: assessment of the ecological state of the landscape economic structure and development of recommendations for the protection of natural and territorial complexes of the Tatarbunar’skyi District of Odessa region based on the use of GIS and remote sensing data. Methods. Landsat8 satellite images with OLI and TIRS sensors, digital terrain models (SRTM) with a spatial resolution of 30 m were used as initial data. The spatial distribution of the population was carried out on the basis of OpenStreetMap data using automatic interpolation using the IDW method. Spatial analysis and data processing were carried out in the QGIS v3.4.6 software package. To quantify the vegetation cover, the Normalized Difference Vegetation Index - NDVI was calculated. Waterlog distribution was estimated using a modified normalized differential moisture index (NDMI). The analysis of the structure of land use and anthropogenic load was carried out on the basis of ranking of territorial objects into homogeneous groups to calculate geoecological coefficients. Results. The article discusses the possibilities of using Earth remote sensing data for a functional assessment of land changes as a result of anthropogenic activities, primarily arable land, analyzes the ecological and economic equilibrium of the region based on geoecological coefficients, identifies areas that are primarily exposed to environmental risks, exogenous processes and the impact anthropogenic factors. Measures are proposed to increase the environmental sustainability of agrolandscapes and the landscape-anthropogenic structure of the region’s lands. A detailed hydrological and morphometric analysis of the catchment basin was carried out. Karachaus within the boundaries of the District. For the catchment estuary, remediation and nature conservation measures based on GIS are proposed and designed.


Author(s):  
Arthur Gani Koto

Dry land occupies the largest area (90%) and has a strategic position in agricultural development activities in Indonesia. The biggest potential of natural resources in the agricultural sector in the district was reached 40.26%. One of the data provider of effective and efficient in terms of development activities and development of the region is remote sensing data. The purpose of this study is to map the area of dry land with the help of remote sensing data. Landsat imagery 8 extracted to obtain land cover information which is then further processed to produce a land use classification is based on the knowledge based classification. Analyzed land use to obtain the map of dry land. The results showed that the District of Wonosari has an area of dry land scattered in all districts and has an area of 185. 733 km2. Dry land area consists of mixed farms (162.811,8 km2) and bare land (22.921,2 km2). Tanah kering menempati area terbesar (90%) dan memiliki posisi strategis dalam kegiatan pembangunan pertanian di Indonesia. Potensi sumber daya alam terbesar di sektor pertanian di kabupaten ini mencapai 40,26%. Salah satu penyedia data yang efektif dan efisien dalam hal kegiatan pengembangan dan pengembangan kawasan adalah data penginderaan jauh. Tujuan dari penelitian ini adalah untuk memetakan daerah lahan kering dengan bantuan data penginderaan jarak jauh. Citra landsat 8 diekstraksi untuk mendapatkan informasi tutupan lahan yang kemudian diproses lebih lanjut untuk menghasilkan klasifikasi penggunaan lahan berdasarkan klasifikasi berbasis pengetahuan. Menganalisis penggunaan lahan untuk mendapatkan peta lahan kering. Hasil penelitian menunjukkan bahwa Kabupaten Wonosari memiliki lahan kering yang tersebar di semua kecamatan dan memiliki luas wilayah 185. 733 km2. Luas lahan kering terdiri dari lahan pertanian campuran (162,811,8 km2) dan lahan kosong (22.921,2 km2).


2021 ◽  
Vol 30 (1) ◽  
pp. 179-189
Author(s):  
Viktor I. Vyshnevskyi ◽  
Vladislav A. Zhezherya ◽  
Inna M. Nezbrytska ◽  
Olena P. Bilous

Lake Telbyn is considered to be one of the largest lakes located in the eastern part of Kyiv. The artificial aeration of this lake was started at the end of 2016 by using of 8 aerators, which has been continuing so far. The main perpose of this measure is improving the ecological state of the lake mostly for recreational use. There were carried out a field study of the lake and the analysis of remote sensing data. Physical and chemical characteristics of water, phytoplankton biomass, chlo- rophyll a concentration and some other parameters at the different depths were studied. It was found out that artificial aeration has a positive effect on the ecological state of the lake. The water aeration causes the blur of thermocline whereas the impact on its depth is not essential. Under impact of aeration the concentration of dissolved oxygen become larger, mostly in the bottom layer. The highest concentration of ammonium nitrogen in a warm period is observed in the bottom layer of the lake. The deep location of aerators causes the increasing of concentration in bottom layer. At the same time there is not visible impact on concentration near the surface. The similar result was obtained for the concentration of inorganic phosphorus. The impact of aeration on algal bloom is not such essential as on hydrochemical characteristics. The artificial aeration causes negative impact on the phytoplankton abundance and less effect on their biomass. It means the larger effect on the algae with small cells. In other words the aeration has larger impact on green algae than on blue-green ones. The use of remote sensing data showed that ecological state of Lake Telbyn during the aeration period improved comparably with other lakes of Kyiv. As a result of aeration, the view of water surface of the lake became more similar to water surface of the Dnipro River, which flows through the city.


2002 ◽  
Vol 8 (1) ◽  
pp. 15-22
Author(s):  
V.N. Astapenko ◽  
◽  
Ye.I. Bushuev ◽  
V.P. Zubko ◽  
V.I. Ivanov ◽  
...  

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