scholarly journals Studi Penentuan Nilai Koefisien Pengaliran DAS Batang Arau di Kota Padang

2020 ◽  
Vol 15 (2) ◽  
pp. 55
Author(s):  
Fitri Handayani ◽  
Rahmania Hardiyenti ◽  
Indra Agus ◽  
Sadtim - ◽  
Hartati -

Batang Arau river is located 0048” up to 0056” SL (South Latitude) and on 100021” up to 100033” LE (Longitutede East), and upstream part water catcment area it is cover 30,90 km2 area. The above said catchment area is a region consist of densely .populated and also dominated by vegetation of natural forest, protected forest, people’s forest, mixed forest, farm, recefield and yard. Based on site observation, most of the forest has changed become residant farms and settlement. This condition can be shown by land use map and change of runoff which was change from year to year. With this land use change however will also affecty changing of runoff coefficient. The goals of this study is to get flow coefficient (c) based on land use coefficient, debit AWLR, and based on SWAT application. Calculation of the coefficient based on land use map until be done by Arcgis method, debit AWLR using Hasper method and SWAT application. Study shown in period between 2009 – 2017, coefficient flow result is in range 0,36 – 0,37. Flow coefficient using AWLR result is in range 0,36 – 0,37, while flow coefficient using SWAT method is 0,25 – 0,36

2021 ◽  
Vol 14 (2) ◽  
pp. 10-18
Author(s):  
Herry Andrisa ◽  
Hairul Basri ◽  
Muhammad Rusdi

Abstrak. Penelitian ini bertujuan untuk mengetahui pengaruh rehabilitasi lahan dan hutan (RHL) terhadap nilai koefisien aliran tahunan (KAT) di sub-DAS Krueng Meulesong. Pelaksanaan RHL di Desa Riting Kecamatan Indrapuri Kabupaten Aceh Besar yang termasuk dalam DAS Krueng Meuleusong dikategorikan tidak berhasil berdasarkan citra satelit perubahan tata guna lahan tahun 2009, 2014, 2017 dan 2019. Hasil interpretasi citra satelit menunjukkan penurunan luasan hutan sekunder, namun luas perdu dan sabana meningkat. Berdasarkan hasil uji korelasi menunjukkan bahwa pelaksanaan kegiatan RHL tidak berpengaruh terhadap perubahan penggunaan lahan menjadi hutan sekunder dan kegiatan RHL tidak berpengaruh terhadap nilai koefisien aliran tahunan (KAT) di Sub-DAS Krueng Meuleusong.Evaluation Of The Effect Of Land And Forest Rehabilitation On Annual Flow Coefficient In Krueng Meuleusong Sub-WatershedAbstract. This study aims to determine the effect of land and forest rehabilitation (RHL) on the value of the annual flow coefficient (KAT) in the Krueng Meulesong sub-watershed. The implementation of RHL in Riting Village, Indrapuri District, Aceh Besar District which is included in the water catchment area of the Krueng Meuleusong sub-watershed is categorized as unsuccessful based on satellite imagery of 2009, 2014, 2017 and, 2019 of land-use change. The results of satellite imagery interpretation showed a decrease in the area of secondary forest, but shrubs and savanna area had increased. Based on the results of the correlation test, shows that the implementation of RHL activities has no effect on changes in land use to secondary forests and RHL activities have no effect on the value of annual flow coefficient (KAT) in the Krueng Krueng Meuleusong sub-watershed.


2018 ◽  
Vol 6 (1) ◽  
pp. 73
Author(s):  
Eko Supriyadi ◽  
Irwan Sukri Banuwa ◽  
Slamet Budi Yuwono

Sekampung Hulu Watershed (DAS) is a catchment area for the Batutegi Dam. Changes in land use due to increasement of human need for land can affect the hydrological conditions of Sekampung Hulu Watershed. This research analyzed land use change to inflow characteristic of Batutegi Dam using descriptive analysis method by analyzing rainfall data, land use change data, inflow data and surface coefficient data. The results showed that there had been decreasing of forest area and the increasing of agriculture land, dry land, and shrubland. It affects the increasing of surface coefficient and decreasing of total inflow. The decrease in total inflow of batutegi dam in 2005 was 7.229,92 m3 / sec and in 2015 was 6.846,82 m3 / sec. This is due to the value of surface runoff coefficient in the Sekampung Hulu Watershed which increased in 2005 and 2015 by 0,23 to 0,34. The amount of surface coefficient value in 2005 and 2015 shows that the Sekampung Hulu Basin has been degraded, therefore it is necessary to restore the condition of the forest through reforestation and greening efforts to increase the water catchment area.Keywords: Sekampung Hulu Watershed; Inflow; Land use change.Daerah Aliran Sungai (DAS) Sekampung Hulu merupakan daerah tangkapan air (catchment area) bagi Bendungan Batutegi. Perubahan penggunaan lahan akibat meningkatnya kebutuhan manusia terhadap lahan dapat berpengaruh terhadap kondisi hidrologi DAS Sekampung Hulu. Penelitian ini menganalisis perubahan penggunaan lahan terhadap karakteristik aliran masuk (inflow) Bendungan Batutegi digunakan metode analisis deskriptif dengan cara manganalisis data curah hujan, data perubahan penggunaan lahan, data inflow dan data koefisien aliran permukaan. Hasil penelitian memperlihatkansudah terjadi penurunan luas hutan dan peningkatan luas pertanian lahan kering, pemukiman, dan semak belukar. Hal tersebut berpengaruh terhadap peningkatan koefisien aliran permukaan dan penurunan total inflow. Penurunan total inflow bendungan batutegi tahun 2005 sebesar 7.229,92 m3/detik dan pada tahun 2015 sebesar 6.846,82 m3/detik. Hal tersebut disebabkan oleh nilai koefisien aliran permukaan di DAS Sekampung Hulu yang mengalami peningkatan pada tahun 2005 dan 2015 sebesar 0,23 menjadi 0,34. Besarnya  nilai koefisien aliran permukaan tahun 2005 dan 2015 menunjukkan DAS Sekampung Hulu telah mengalami degradasi, oleh karena itu perlu dilakukan pemulihan kondisi hutan melalui upaya reboisasi maupun penghijauan untuk menambah daerah resapan air.Kata kunci: DAS Sekampung Hulu; Inflow; Perubahan penggunaan Lahan


2016 ◽  
Vol 9 (2) ◽  
pp. 147-156
Author(s):  
Devianti Devianti

Abstrak. Sub Sub DAS Cikujang merupakan salah satu bagian dari Sub DAS Cimanuk hulu yang dapat menyumbang sedimen ke waduk Jatigede yang berasal dari erosi sebagai akibat perubahan penggunaan lahan yang tidak sesuai dengan kondisi fisik lahan. Hasil kajian memperlihatkan  pola perubahan penggunaan lahan di Sub Sub DAS Cikujang periode 1994-2009, terjadi perubahan penggunaan lahan dari kawasan lindung menjadi kawasan budidaya seluas 742,20 ha. Kawasan lindung pada tahun 1994 seluas 3.213,03 ha menurun menjadi 2.470,83 ha pada tahun 2009 dan kawasan budidaya pada tahun 1994 seluas 9.532,41 ha meningkat menjadi 10.274,61 ha pada tahun 2009 dengan laju perubahan 185,55 ha/tahun. Laju penurunan luasan hutan primer mencapai 54,45 ha/tahun, dan pada tahun 2009 tidak terdapat lagi lahan dengan fungsi sebagai hutan primer. Laju penurunan luasan hutan sekunder mencapai 135,90 ha/tahun dari 2.995,25 ha pada tahun 1994 menjadi 2.451,65 ha pada tahun 2009. Pola perubahan penggunaan lahan di Sub Sub DAS Cikujang sebagian besar dipengaruhi dengan pola perubahan hutan primer dan hutan sekunder pada kawasan lindung. Sedangkan pola perubahan penggunaan lahan pada kawasan budidaya dipengaruhi pola perubahan lahan kebun campuran, tegalan/ladang, perkebunan, dan sawah Land-Use Change Pattern in Cikujang Catchment Area Abstract. Cikujang catchment area is one part of the subzone Cimanuk that can contribute sediment upstream reservoirs to Jatigede derived from erosion as a result of changes in land use that is not in accordance with the physical condition of the land. Based on analysis result of land-use change pattern in Cikujang catchment area in 1994 – 2009 period, land-use had changed 742,20ha from protected areas to cultivated areas, where protected area had decreased from 3.213,03ha in 1994 to 2.470,83ha in 2009 and cultivated area had increased from 10.274,61 ha in 1994 to10.274,61 ha in 2009 with changing rate ha/year. The rate of decreasing primary forest area was 54.45ha/year, as a result there was no land function as primary forest in 2009.  The rate of decreasing secondary forest area was 135,90ha/year ranging from 2.995,25ha in 1994 to 2.451,65ha in 2009. Land-use change pattern in Cikujang catchment area dominantly was influenced by changing pattern of protected forest and secondary forest in protected area, but in cultivated area land-use change pattern was influenced by changing pattern of farm, grassland, and rice field.


Author(s):  
H. M. Paba Herath ◽  
K. W. G. Rekha Nianthi

The land use of the Belihuloya catchment area in Sri Lanka has been changing over a long period mainly due to the human activities. The study was aimed to find out the spatial and temporal changes of land use in the Belihuloya Mini Catchment area of 1956 to 2015, and obtain the local people's perception of the effects of land-use changes in Belihuloya. To study the people's perceptions of land use change, a questionnaire survey was conducted among randomly selected 180 households. Aerial data of 1956 and satellite data of 2015 were used to analyze the land use changes. The vegetation cover maps of 1956 and 2015, demonstrated the drastic changes of land use in Belihuloya. More than 50% of the respondents in the study area perceived that the land use has been changing due to the construction activities, forest fires, illegal loggings, pine and tea cultivation and the expansion of built-up areas. The deforestation has badly effected on water resources in the Belihuloya. The reforestation programs, including community-based reforestation programs can be introduced to minimize the impacts. It is necessary to implement existing legal frameworks with supports of different stakeholders to conserve the Belihuloya.


2014 ◽  
Vol 60 (No. 1) ◽  
pp. 15-20 ◽  
Author(s):  
Q. Li ◽  
Liang JH ◽  
He YY ◽  
Hu QJ ◽  
S. Yu

The study of soil enzyme activities under different land use is of importance for exploration of the soil quality evolution and its evaluation during the revegetation at karst area in Nanchuan, Chongqing, China. Seven kinds of land use were chosen as subject, aiming at revealing the changes in soil enzyme activities through experimental and statistical analysis. The results showed that different land use significantly influenced the enzyme activities. Soil urease, invertase, catalase and amylase behaved the different change. A descending order of urease activity was artificial forest, natural forest, shrubbery, grassland, slope field into terrace, rock desertification and farmland. As to invertase and amylase, they have no clear change orderliness with land use change. Moreover, no significant change was observed in catalase activity and the lower value was found in natural forest. The above results cannot reflect the land use effect on the enzyme activities. According to the soil enzyme index (SEI), it can be seen that the SEI changed with an order of natural forest > artificial forest > grassland > shrubbery > farmland > slope field into terrace > rock desertification, which can objectively and fully evaluate the land use change in soil enzyme.


2011 ◽  
Vol 262 (6) ◽  
pp. 1131-1137 ◽  
Author(s):  
Juan Liu ◽  
Peikun Jiang ◽  
Hailong Wang ◽  
Guomo Zhou ◽  
Jiasen Wu ◽  
...  

2021 ◽  
Vol 2 (1) ◽  
pp. 01-19
Author(s):  
T. G. Adelalu ◽  
A. Ibrahim ◽  
E. B. Benjamin ◽  
G. C. Yakubu

Anthropogenic nexus of environmental change is a vital issue in flood control and hazard management. While it is true that some will loom in flood and others in drought, it is no longer valid to argue the authenticity of climate change. Though climate change alters our physical veracities, the problem of yearly flooding is more a human than a natural one in Taraba State. This paper provides technical proof of anthropogenic impression in the incessant flooding in the area. Both spatial and hydro-climatic data were used for this study in addition to designed questionnaire. Hydro and climatic data were collected from Upper Benue River Basin Development Agency, Yola. Correlation matrix was used to show the extent of climatic variation and GIS depicts the land use change. Rainfall has not related well with excess channel flow. Coefficient of variation in rainfall and runoff is not pronounced. R- Factor in all the gauging stations is very low. Built up area occupied just 2.8% of the area accounting for 806.9 hectares. Cultivated area and the bare land was about 13146.2 hectares. This accounts for about 46.3% of the area. Vegetation cover occupied more than half of the study area. This accounts for 50.1% of the land mass of the catchment area under study. Owing to the occurrence of good vegetation cover, which is more than 50% of the basin area, generally one would have expected low occurrence of flooding in the study area. The farmers’ assessment agreed with the scientific analysis. The runoff volumes that traverse the state three decades ago without much disturbance now pose a serious ache. Though Inter catchment link and discharge thereof is a factor, the cogwheel pinpoints land use change and encroachment of floodplain. Parastatals involved in the land survey and planning of the state should wake up to the challenge.


2014 ◽  
Vol 2-3 ◽  
pp. 1-8 ◽  
Author(s):  
Anu Akujärvi ◽  
Jaakko Heikkinen ◽  
Taru Palosuo ◽  
Jari Liski

2019 ◽  
Vol 276 ◽  
pp. 04014
Author(s):  
Nurdin ◽  
Syaiful Bahri ◽  
Zulkarnain ◽  
Sukendi

This study aims to analyze the hydrological characteristics as a result of changes in land use with the help of the SWAT hydrological model and can provide recommendations on the best land use in the Koto Panjang Electric Power catchment area. Based on the results of the analysis using the SWAT hydrological model, it was seen that there were effects of land use changes in 2011 and 2014 on hydrological characteristics; yield of water (WATER YLD) of 2,413.38 mm, and 1.008, 65 mm, runoff coefficient (C) of 0.19 and 0.063 respectively, and river regime coefficient (KRS) of 11.449 and 12.212, respectively. The best land use to be developed in agricultural cultivation areas as a recommendation to maintain water stability in the Koto Panjang hydropower catchment area is a simple and complex agroforestry pattern in scenario III, which is run together with hydrological characteristics in the form; water yield (WATER YLD) of 1,038.41, surface runoff coefficient (C) of 0.023, and river regime coefficient (KRS) of 11.13. The hydrological characteristics in scenario III are far better than 2014 land use characteristics (existing).


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