Remote sensing for resources development and environmental management: Remote sensing for resources development and environmental management

Damen, M. C. J.

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Multivolume work

Persistent identifier:: 856342815

Title:: Remote sensing for resources development and environmental management

Sub title:: proceedings of the 7th international Symposium, Enschede, 25 - 29 August 1986

Year of publication:: 1986

Place of publication:: Rotterdam; Boston

Publisher of the original:: A. A. Balkema

Identifier (digital):: 856342815

Language:: English

Additional Notes:: Volume 1-3 erschienen von 1986-1988

Editor:: Damen, M. C. J.

Document type:: Multivolume work

Volume

Persistent identifier:: 856343064

Title:: Remote sensing for resources development and environmental management

Sub title:: proceedings of the 7th international Symposium, Enschede, 25 - 29 August 1986

Scope:: XV, 547 Seiten

Year of publication:: 1986

Place of publication:: Rotterdam; Boston

Publisher of the original:: A. A. Balkema

Identifier (digital):: 856343064

Illustration:: Illustrationen, Diagramme

Signature of the source:: ZS 312(26,7,1)

Language:: English

Usage licence:: Attribution 4.0 International (CC BY 4.0)

Editor:: Damen, M. C. J.

Publisher of the digital copy:: Technische Informationsbibliothek Hannover

Place of publication of the digital copy:: Hannover

Year of publication of the original:: 2016

Document type:: Volume

Collection:: Earth sciences

Chapter

Title:: 4 Renewable resources in rural areas: Vegetation, forestry, agriculture, soil survey, land and water use. Chairman: J. Besenicar, Liaisons: M. Molenaar, Th. A. de Boer

Document type:: Multivolume work

Structure type:: Chapter

Chapter

Title:: Application of multispectral scanning remote sensing in agricultural water management problems. G. J. A. Nieuwenhuis, J. M. M. Bouwmans

Document type:: Multivolume work

Structure type:: Chapter

ils in which :low is link- about regional . GAM-model lei. :ic view about water and the nage. The The avail- piration is the root zone; subsoil ; rowing season; sprinkling sndent on soil reliable in- ristics and d if sprinkling soil-plant- mentioned termined under at for the ex damage as de ns with agro- applied. racteristics fter a dry of the peat Netherlands ly potatoes 0%) are grown, i the available u as well, show high tem- ight conditions 1 more peaty ¡how lower tem iese soils are r crops grown i than 40 cm »elow soil sur- .mal water sup- study area 1 at 13.30 MET. the indicated Figure 3. Thermal image of a part of study area 1 (see Figure 1) taken on 8 August 1983 at 13.30 MET. Black is cold and white is warm. Of the indicated plot only the middle strip is unimproved Figure 4. Evapotranspiration map of study area 2 (see Figure 1). The map is composed from reflection and heat images taken on 21 July 1983 at 11.30 MET. Crop évapotranspiration decreases from potential (dark grey) to about 30% of potential (white). Black areas are not classified (scale 1:125,000) ply. In this case the available moisture capacity is sufficient to get through extreme dry periods in the Netherlands. In the mentioned peat area soil improvement has been performed on a large scale. On several places the hy draulic conductivity of layers in the subsoil was very low, resulting in water excess in wet periods and drought damage in dry periods. Effects of soil improvement works on crop production have been studied on experimental fields. With thermal images taken at 8 August 1983 it was investigated if information about soil improvement could be obtained with the aid of remote sensing images. One typical result is shown in Figure 3. On the indicated plot potatoes were grown. Two strips at the border of the plot were improved while the middle strip was not. Parts of the plot with deep peat soils show very low temperatures. Es pecially where less peat was present a systematic difference in temperature of 0.6 K was found between the improved and unimproved part of the plot. With eqs. (1) and (2) an increase in évapotranspiration of 15% is calculated thanks to the soil improvement. By comparing improved and unimproved plots for each soil type a positive effect for peaty soils was observed, while for sandy soils like Haplaquods no effects were found (Kok 1985). In spite of the application of soil improvement crops grown on sandy soils show severe drought damage under the prevailing weather condi tions in 1982. In the southwestern part of the Netherlands (study area 2 in Figure 1) the influence of loam layers in the subsoil on crop water supply was studied with images taken at 21 July 1983 (Spaans 1986). In. gener al no influence of the presence of loam was percep tible. One subregion, however, indicated in Figure 4 showed significant high crop temperatures and hence low relative évapotranspiration values. Because of the shallow groundwater table depth in this area no drought damage was expected. From field observations it was found that the soil physical characteristics of the loam layer in this subregion differed a lot from those of the loam layer that was found at other places in the project area. The hydraulic conductivity was much lower and therefore capillary rise was less for comparable groundwater depths. This resulted in larger reductions in évapotranspiration. With the aid of the évapotrans piration map this subregion could be mapped more ac curately. It seems possible that under certain conditions the hydraulic conductivity of the subsoil can be checked or perhaps even can be determined with the aid of évapotranspiration maps. A more detailed study on this subject has not been carried out yet. 3.2 Influence of groundwater table depth on crop wa ter supply Thermal images taken at the boundary of the peat area Figure 5. Thermal image of a part of study area 1 (see Figure 1) taken on 4 August 1982 at 12.30 MET. Black is cold and white is warm

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