Evaluasi Pengaruh Rehabilitasi Lahan Dan Hutan Terhadap Koefisien Aliran Tahunan Di Sub Das Krueng Meuleusong

Land use change have an impact on infiltration capacity. There is often an annual flood on Kadumanggu District. When the rainfall is high so the river will be overflow. The outlet of Cikeas sub-basin was located on Kadumanggu District. This research aimed to determine the maximum discharge of the Cikeas River and analyze the relation between land use change and discharge of Cikeas River. The research was conducted by delineating the water catchment area, analyzing rainfall, making a land use map and modeling with HEC-HMS. Based on the modeling results, the maximum discharge of the Cikeas River in 2000 was 74.3 m3/s, in 2009 was 84.9 m3/s, and in 2018 was 91.7 m3/s. The catchment area with an extensive use as residential had a higher river discharge compared to the area with a large green area. It meaned that, land use changes greatly affected the river discharge.

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DAMPAK PERUBAHAN GUNA LAHAN TERHADAP KEMAMPUAN RESAPAN AIR (KASUS: KOTA SAMARINDA)

JURNAL PEMBANGUNAN WILAYAH & KOTA ◽

10.14710/pwk.v15i1.20713 ◽

2019 ◽

Vol 15 (1) ◽

pp. 70 ◽

Cited By ~ 1

Author(s):

Warsilan Warsilan

Keyword(s):

Land Use ◽

Catchment Area ◽

Infrastructure Development ◽

City Development ◽

Water Catchment Area ◽

East Kalimantan ◽

City Culture ◽

Water Catchment ◽

The Impact

As the capital of the province of East Kalimantan, Samarinda City developments has a rapid progress from year to year. Samarinda City Development has a tendency oriented towards infrastructure development without regard to the existence of the quality of the existing environment. Imbalance of development in Samarinda city is to start decreasing the water catchment area, so its make increasing intensity of flood in the Samarinda City. The purpose of this study was to analyze the impact of changes in land use in the Samarinda city on the ability of the water catchment area. This research method using descriptive approach, the data collection system of primary and secondary. Intensity flood in the Samarinda city is increasing from year to year, this condition happened as a problem that always occurs during the rainy season. Current development trends, always take an area that should be an infiltration area for Samarinda City. Culture and inadequate infrastructure conditions such as lack of system of drainage and polder, was another factor causing the high intensity of flood in Samarinda City. Therefore, the relevant regulations development guidelines for Samarinda City must consider all aspects of planning, in this case especially the important of a balance of cultivated land and protected areas or zones.Keywords: Changes in land use; intensity of puddles; Samarinda

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Pola Perubahan Penggunaan Lahan Sub Sub Daerah Aliran Sungai (DAS) Cikujang

Rona Teknik Pertanian ◽

10.17969/rtp.v9i2.5651 ◽

2016 ◽

Vol 9 (2) ◽

pp. 147-156

Author(s):

Devianti Devianti

Keyword(s):

Land Use ◽

Land Use Change ◽

Protected Area ◽

Catchment Area ◽

Rice Field ◽

Secondary Forest ◽

Forest Area ◽

Primary Forest ◽

Change Pattern ◽

Changing Rate

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.

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Flood Management Based on The Potential Urban Catchments Case Study Padang City

Sumatra Journal of Disaster Geography and Geography Education ◽

10.24036/sjdgge.v5i1.367 ◽

2021 ◽

Vol 5 (1) ◽

pp. 49-54

Author(s):

Dwi Marsiska Driptufany ◽

Quinoza Guvil ◽

Desi Syafriani ◽

Dwi Arini

Keyword(s):

Land Use ◽

Catchment Area ◽

Water Infiltration ◽

Geographical Information ◽

Landsat 8 ◽

Water Catchment Area ◽

Catchment Areas ◽

Wide Range ◽

Urban Catchments ◽

Water Catchment

The water catchment area also indirectly impacts on flood control for areas that are lower than it because rainwater does not fall to the lower areas but is absorbed as groundwater. Increased development of Padang City will be inversely proportional to the reduction in water catchment areas and become an area that is impermeable that makes rainwater stagnate on the surface and flood occurs. The development of remote sensing technology and geographic information systems has made it possible to study the spatial patterns of potential water catchment areas in a wide range, including mapping the potential of water catchment areas in Padang City. This study aims to analyze the condition of the availability of water catchment areas for controlling water management and flood disasters in Padang City based on data on spatial parameters such as rainfall data, slope, soil type maps, and land use obtained from Landsat 8 OLI imagery data. This study uses the scoring and overlay method with the Geographical Information System. The results show that the condition of the water catchment area in the western part of Padang City have been critical, reaching 18.29% of the total area of Padang City, this is due to land use that has undergone a change of function. If the water infiltration condition worsens (critical), it gives more opportunities for flooding and inundation. Thus the areas with the potential for water absorption which are categorized as critical and very critical in the research location can be said to be areas that are potentially prone to flooding and inundation, because the ground surface is no longer able to absorb water. Monitoring the potential of water catchment areas is one form of flood mitigation efforts.

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Contributions of secondary forest and nitrogen dynamics to terrestrial carbon uptake

Biogeosciences Discussions ◽

10.5194/bgd-7-2739-2010 ◽

2010 ◽

Vol 7 (2) ◽

pp. 2739-2765 ◽

Cited By ~ 1

Author(s):

X. Yang ◽

T. K. Richardson ◽

A. K. Jain

Keyword(s):

Land Use ◽

Land Use Change ◽

Secondary Forest ◽

Nitrogen Dynamics ◽

Carbon Uptake ◽

Secondary Forests ◽

Terrestrial Carbon ◽

Tropical Regions ◽

Forest Regrowth ◽

Limiting Nutrient

Abstract. We use a terrestrial carbon-nitrogen cycle component of the Integrated Science Assessment Model (ISAM) to investigate the impacts of nitrogen dynamics on regrowing secondary forests over the 20th century. We further examine what the impacts of nitrogen deposition and land use change history are on terrestrial carbon uptake since preindustrial time. Our results suggest that global total net land use emissions for the 1990s associated with changes in cropland, pastureland, and wood harvest are 1.22 GtC/yr. Without considering the secondary forest regrowth, the estimated net global total land use emissions are 1.58 GtC/yr or about 0.36 GtC/yr higher than if secondary forest regrowth is considered. Results also show that without considering the nitrogen dynamics and deposition, the estimated global total secondary forest sink for the 1990s is 0.90 GtC/yr or about 0.54 GtC/yr higher than estimates that include the impacts of nitrogen dynamics and deposition. Nitrogen deposition alone is responsible for about 0.13 GtC/yr of the total secondary forest sink. While nitrogen is not a limiting nutrient in the intact primary forests in tropical regions, our study suggests that nitrogen becomes a limiting nutrient for regrowing secondary forests of the tropical regions, in particular Latin America and Tropical Africa. This is because land use change activities, especially wood harvest, removes large amounts of nitrogen from the system when slash is burnt or wood is removed for harvest. However, our model results show that carbon uptake is enhanced in the tropical secondary forests of the Indian region. We argue that this may be due to enhanced nitrogen mineralization and increased nitrogen availability following land use change in the Indian tropical forest ecosystems. Results also demonstrate that there is a significant amount of carbon accumulating in the Northern Hemisphere where most land use changes and forest regrowth has occurred in recent decades. This study indicates the significance of secondary forests to terrestrial carbon sinks, the importance of nitrogen dynamics to the magnitude of secondary forests carbon uptake, and therefore the need to include both primary and secondary forests and nitrogen dynamics in terrestrial ecosystem models.

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Smaller global and regional carbon emissions from gross land use change when considering sub-grid secondary land cohorts in a global dynamic vegetation model

Biogeosciences ◽

10.5194/bg-15-1185-2018 ◽

2018 ◽

Vol 15 (4) ◽

pp. 1185-1201 ◽

Cited By ~ 3

Author(s):

Chao Yue ◽

Philippe Ciais ◽

Wei Li

Keyword(s):

Land Use ◽

Land Use Change ◽

Carbon Emissions ◽

Shifting Cultivation ◽

Secondary Forest ◽

Secondary Forests ◽

Forest Age ◽

Rotation Length ◽

Historical Land Use ◽

Wood Harvest

Abstract. Several modelling studies reported elevated carbon emissions from historical land use change (ELUC) by including bidirectional transitions on the sub-grid scale (termed gross land use change), dominated by shifting cultivation and other land turnover processes. However, most dynamic global vegetation models (DGVMs) that have implemented gross land use change either do not account for sub-grid secondary lands, or often have only one single secondary land tile over a model grid cell and thus cannot account for various rotation lengths in shifting cultivation and associated secondary forest age dynamics. Therefore, it remains uncertain how realistic the past ELUC estimations are and how estimated ELUC will differ between the two modelling approaches with and without multiple sub-grid secondary land cohorts – in particular secondary forest cohorts. Here we investigated historical ELUC over 1501–2005 by including sub-grid forest age dynamics in a DGVM. We run two simulations, one with no secondary forests (Sageless) and the other with sub-grid secondary forests of six age classes whose demography is driven by historical land use change (Sage). Estimated global ELUC for 1501–2005 is 176 Pg C in Sage compared to 197 Pg C in Sageless. The lower ELUC values in Sage arise mainly from shifting cultivation in the tropics under an assumed constant rotation length of 15 years, being 27 Pg C in Sage in contrast to 46 Pg C in Sageless. Estimated cumulative ELUC values from wood harvest in the Sage simulation (31 Pg C) are however slightly higher than Sageless (27 Pg C) when the model is forced by reconstructed harvested areas because secondary forests targeted in Sage for harvest priority are insufficient to meet the prescribed harvest area, leading to wood harvest being dominated by old primary forests. An alternative approach to quantify wood harvest ELUC, i.e. always harvesting the close-to-mature forests in both Sageless and Sage, yields similar values of 33 Pg C by both simulations. The lower ELUC from shifting cultivation in Sage simulations depends on the predefined forest clearing priority rules in the model and the assumed rotation length. A set of sensitivity model runs over Africa reveal that a longer rotation length over the historical period likely results in higher emissions. Our results highlight that although gross land use change as a former missing emission component is included by a growing number of DGVMs, its contribution to overall ELUC remains uncertain and tends to be overestimated when models ignore sub-grid secondary forests.

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Contributions of secondary forest and nitrogen dynamics to terrestrial carbon uptake

Biogeosciences ◽

10.5194/bg-7-3041-2010 ◽

2010 ◽

Vol 7 (10) ◽

pp. 3041-3050 ◽

Cited By ~ 31

Author(s):

X. Yang ◽

T. K. Richardson ◽

A. K. Jain

Keyword(s):

Land Use ◽

Land Use Change ◽

Secondary Forest ◽

Nitrogen Dynamics ◽

Carbon Uptake ◽

Secondary Forests ◽

Terrestrial Carbon ◽

Tropical Regions ◽

Forest Regrowth ◽

Limiting Nutrient

Abstract. We use a terrestrial carbon-nitrogen cycle component of the Integrated Science Assessment Model (ISAM) to investigate the impacts of nitrogen dynamics on regrowing secondary forests over the 20th century. We further examine what the impacts of nitrogen deposition and land use change history are on terrestrial carbon uptake since preindustrial time. Our results suggest that global total net land use emissions for the 1990s associated with changes in cropland, pastureland, and wood harvest are 1.22 GtC/yr. Without considering the secondary forest regrowth, the estimated net global total land use emissions are 1.58 GtC/yr or about 0.36 GtC/yr higher than if secondary forest regrowth is considered. Results also show that without considering the nitrogen dynamics and deposition, the estimated global total secondary forest sink for the 1990s is 0.90 GtC/yr or about 0.54 GtC/yr higher than estimates that include the impacts of nitrogen dynamics and deposition. Nitrogen deposition alone is responsible for about 0.13 GtC/yr of the total secondary forest sink. While nitrogen is not a limiting nutrient in the intact primary forests in tropical regions, our study suggests that nitrogen becomes a limiting nutrient for regrowing secondary forests of the tropical regions, in particular Latin America and Tropical Africa. This is because land use change activities, especially wood harvest, removes large amounts of nitrogen from the system when slash is burnt or wood is removed for harvest. However, our model results show that carbon uptake is enhanced in the tropical secondary forests of the Indian region. We argue that this may be due to enhanced nitrogen mineralization and increased nitrogen availability following land use change in the Indian tropical forest ecosystems. Results also demonstrate that there is a significant amount of carbon accumulating in the Northern Hemisphere where most land use changes and forest regrowth has occurred in recent decades. This study indicates the significance of secondary forests to terrestrial carbon sinks, the importance of nitrogen dynamics to the magnitude of secondary forests carbon uptake, and therefore the need to include both primary and secondary forests and nitrogen dynamics in terrestrial ecosystem models.

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Studi Penentuan Nilai Koefisien Pengaliran DAS Batang Arau di Kota Padang

Jurnal Ilmiah Poli Rekayasa ◽

10.30630/jipr.15.2.167 ◽

2020 ◽

Vol 15 (2) ◽

pp. 55

Author(s):

Fitri Handayani ◽

Rahmania Hardiyenti ◽

Indra Agus ◽

Sadtim - ◽

Hartati -

Keyword(s):

Land Use ◽

Land Use Change ◽

Catchment Area ◽

Mixed Forest ◽

Natural Forest ◽

Flow Coefficient ◽

Runoff Coefficient ◽

Application Study ◽

Upstream Part ◽

Forest Farm

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

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PENGARUH PERUBAHAN PENGGUNAAN LAHAN TERHADAP KARAKTERISTIK ALIRAN MASUK (INFLOW) BENDUNGAN BATUTEGI The Effect of Land Use Change on the Inflow Characteristics of Batutegi Dam

Jurnal Hutan Tropis ◽

10.20527/jht.v6i1.5107 ◽

2018 ◽

Vol 6 (1) ◽

pp. 73

Author(s):

Eko Supriyadi ◽

Irwan Sukri Banuwa ◽

Slamet Budi Yuwono

Keyword(s):

Land Use ◽

Land Use Change ◽

Catchment Area ◽

Descriptive Analysis ◽

Runoff Coefficient ◽

Analysis Method ◽

Dry Land ◽

Human Need ◽

Water Catchment ◽

Total Inflow

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

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