scholarly journals ANALISIS PERMODELAN SUB DAS PADA DAERAH ALIRAN SUNGAI KRUENG PASE KABUPATEN ACEH UTARA

2019 ◽  
Vol 2 (3) ◽  
pp. 242-247
Author(s):  
Rahmawati Rahmawati ◽  
Eldina Fatimah ◽  
Masimin Masimin
Keyword(s):  
Land Use ◽  
Land Use Change ◽  
Watershed Management ◽  
Rainfall Intensity ◽  
Rational Method ◽  
Flow Coefficient ◽  
Intensity Parameter ◽  
Rapid Reduction ◽  
Run Off ◽  
Map Analysis

Watershed management can be started by evaluation how the response of watershed hydraulic toward rainfall and become run off that will flow downstream. Transformation of rain into flow is a method used to find out effect of land use change and its parameter toward flow hydrograph. Watershed Kr. Pase is one of  most rapid reduction of forest area. Land use change occurred in this watershed affecting discharge amount of run off which required further calculation. This calculation using the rational method by calculating rainfall intensity parameter (I),watershed area (A), and flow coefficient (C) in watershed. Data of land use provide in this study are on year 2007, 2013, and 2017 which will examine watershed Kr. Pase into subwatershed model, whereas from map analysis obtained three subwatersheds. After some calculation off run off discharge at watershed Kr. Pase, than it is use sub-watershed with longest concertration time (tc).

scholarly journals QUANTITATIVE AND QUALITATIVE EVIDENCE OF ANTHROPOGENIC FINGERPRINT IN FLOODING IN TARABA STATE OF NIGERIA

2021 ◽  
Vol 2 (1) ◽  
pp. 01-19
Author(s):  
T. G. Adelalu ◽  
A. Ibrahim ◽  
E. B. Benjamin ◽  
G. C. Yakubu
Keyword(s):  
Climate Change ◽  
Land Use ◽  
Land Use Change ◽  
Vegetation Cover ◽  
Flood Control ◽  
The State ◽  
Flow Coefficient ◽  
Climatic Data ◽  
Hazard Management ◽  
River Basin Development

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 While it is true that some will loom in flood and others in drought, it is no longer valid to argue the authenticity of climate change.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.

scholarly journals Land Use Planning of Way Betung Watershed for Sustainable Water Resources Development of Bandar Lampung City

2013 ◽  
Vol 16 (1) ◽  
pp. 77-84
Author(s):  
Slamet Budi Yuwono ◽  
Naik Sinukaban ◽  
Kukuh Murtilaksono ◽  
Bunasor Sanim
Keyword(s):  
Land Use ◽  
Sustainable Development ◽  
Water Resources ◽  
Land Use Change ◽  
Land Use Planning ◽  
Alley Cropping ◽  
Daily Maximum ◽  
Clean Water ◽  
Watershed Land Use ◽  
Run Off

Way Betung watershed is one of the important water resources in Lampung Province and it provides a clean water for Bandar Lampung City through a regional water supply company (PDAM). By the increase of population and economical activities of Bandar Lampung City, the need of clean water also increase, however by the time, the conditions of Way Betung watershed as water resources are declining. Therefore, to improve or to restore WayBetung watershed, a high cost is needed. The research was aimed: (a) to study the effects of Way Betung watershed land use change on the water resources of Bandar Lampung City, (b) to arrange the sustainable development of Way Betung watershed in order to maintain the availability of water resources. The sustainable developments of water resources of Way Betung watershed were arranged in five alternatives/scenarios and each alternative was related toits erosion (USLE method) and its run off volume (SCS method). The results showed that land use changes of Way Betung watershed (1991-2006) were likely to increase daily maximum discharge (Q max), to decrease daily minimum discharge (Q min), to increase fluctuation of river discharge, and to increase yearly run off coeffcient. The best sustainable development of water resources of Way Betung watershed, Lampung Province, was alternative/scenario-4 (forest as 30% of watershed areas + alley cropping in the mix garden). This alternative will decrease erosion to the level lower than tolerable soil loss and also decrease fluctuation of monthly run off.Keywords: Land use change, run off coefficient, water resources, watershed

scholarly journals Dampak Perubahan Tataguna Lahan Terhadap Keseimbangan Air Wilayah Pulau Seram. Studi Kasus : Das Way Pia Di Kabupaten Maluku Tengah, Provinsi Maluku

Agrologia ◽  
2018 ◽  
Vol 1 (1) ◽  
Author(s):  
Semuel Laimeheriwa
Keyword(s):  
Land Use ◽  
Land Use Change ◽  
Water Balance ◽  
Soil Water ◽  
Global Radiation ◽  
Mathematical Formulation ◽  
Computer Code ◽  
Water Balance Components ◽  
Current Time ◽  
Run Off

This research was conducted to estimate the values of parameters which described the physical characteristics of catchments area and monthly water balance components, and understand the sensitivity of the water balance components to change in the parameter value due to the physical changes occurring in Way Pia catchments area, Ceram Island.  The method used involved calculation of the regional water balance in the current time (normal) and during the time of land use change, using an evapoclimatonomy model. The main model inputs were monthly rainfall, global radiation and run off. Analyses of data were conducted with five steps as follows : (1) mathematical formulation of the evapoclimatonomy model, (2) algorithm formation and transfer to computer code, (3) establishment of parameters and calibration, (4) validation of model, and (5) experimentation of model. The current physical conditions of Way Pia catchments area were characterized by: average of parameter value of albedo, a = 0,16; rainfall threshold, Pn = 100 mm; surface run off ratio, np = 0,23; evapority, ep = 0,42; measure of soil water loss from sub surface, vN = 0,12; and measure of evapotranspiration of soil water from sub surface, vE = 0,20. Model output of the current water balance consisted of  annual value of soil moisture, m = 272 mm; total evapotranspiration, E = 1393 mm, and total run off, N = 920 mm. The land use change  in the form of land clearing will increase the parameter values of a and np, which affect on increasing of direct run off (N') of 13% as compared to current conditions.

scholarly journals Using Backcast Land-Use Change and Groundwater Travel-Time Models to Generate Land-Use Legacy Maps for Watershed Management

2007 ◽  
Vol 12 (2) ◽  
Author(s):  
Bryan Pijanowski ◽  
Deepak K. Ray ◽  
Anthony D. Kendall ◽  
Jonah M. Duckles ◽  
David W. Hyndman
Keyword(s):  
Land Use ◽  
Land Use Change ◽  
Travel Time ◽  
Watershed Management

scholarly journals Perubahan Penggunaan Lahan Terhadap Banjir di Kawasan Daerah Aliran Sungai Maros

2021 ◽  
Vol 3 (2) ◽  
pp. 52-59
Author(s):  
Ridwan Latief ◽  
Roland A. Barkey ◽  
Muh. Iqbal Suhaeb
Keyword(s):  
Land Use ◽  
Land Use Change ◽  
Urban Area ◽  
Linear Regression Analysis ◽  
Analysis Method ◽  
Watershed Area ◽  
Catchment Areas ◽  
Map Analysis ◽  
Water Catchment ◽  
Reduced Water

Kawasan perkotaan di Kabupaten Maros dilalui oleh Sungai Maros. Aliran Sungai Maros mengalir menuju Selat Makassar dan merupakan muara bagi sungai-sungai lain di bagian hulu. Sungai Maros yang melalui kawasan perkotaan memiliki daerah aliran sungai yang sangat rentan untuk dialihfungsikan. Pertumbuhan alih fungsi lahan non terbangun menjadi terbangun secara fakta marak terjadi pada kawasan daerah aliran sungai Maros. Kawasan daerah aliran sungai yang terbanguni berpotensi menyebabkan gangguan ekologis dan hidrologis yang berdampak pada terjadinya banjir karena berkurangnya lahan resapan air serta berubahnya morfologi daerah aliran sungai. Tujuan pertama penelitan ini adalah mengetahui kondisi penggunaan lahan terbangun serta perubahannya dalam kurung waktu 5 tahun terakhir di kawasan Daerah Aliran Sungai Maros menggunakan metode analisi tumpang tindih peta. Tujuan kedua adalah mengkaji pengaruh perubahan penggunaan lahan terbangun terhadap banjir di kawasan Daerah Aliran Sungai Maros dengan menggunakan analisis regresi linear sederhana. Variabel prediktor yang digunakan yaitu perubahan penggunaan lahan (X), dengan variabel kriterium adalah luas banjir (Y). Hasil penelitian menunjukkan bahwa perubahan penggunaan lahan terbangun pada kawasan daerah aliran sungai Maros mengalami peningkatan yang cukup tinggi, dimana lahan kebun yang berubah menjadi permukiman sebesar 18,4 ha. Sedangkan sawah yang berubah menjadi permukiman sebesar 3,68 ha dari tahun 2015 ke tahun 2019. Perubahan penggunaan lahan terbangun yang terjadi berpengaruh kuat dan signifikan terhadap peningkatan luas genangan banjir pada kawasan daerah aliran sungai Maros. The urban area in Maros Regency is traversed by the Maros River. Maros River flows towards Makassar Strait and is the mouth of other rivers in upstream. Maros River which passes through the urban area has a watershed river that is vulnerable to conversion. The growth of conversion of non-built land into built-up areas in fact is rife in Watershed Maros. Developed watershed areas have the potential to cause ecological and hydrological disturbances that have an impact on flooding due to reduced water catchment areas and changing morphology of river basins. The first objective of this research is to determine the conditions of built-up areas and changes within the last 5 years in the Watershed Maros using overlapping map analysis method. The second purpose is to examine the effect of changes in built-up land use on flooding in Maros watershed area using simple linear regression analysis. The predictor variables used are land use change (X), with the criterion variable is the flood area (Y). The results showed that the land use change was built on the watershed area of Maros has increased quite highly, where 18.4 ha of land has been converted into a settlement. While the rice fields are changed to a settlement of 3.68 ha from 2015 to 2019. Changes on the use of built-up land that occurs have a strong and significant effect on increasing the area of  flood inundation in the watershed area of Maros

scholarly journals Land Use Changes and Livelihood Scenarios of Rajahar VDC, Nawalparasi District, Nepal

2015 ◽  
Vol 21 ◽  
pp. 55-62
Author(s):  
Dhurba Prasad Ghimire ◽  
Sunil Babu Khatry ◽  
Bhagawat Rimal
Keyword(s):  
Land Use ◽  
Land Use Change ◽  
Water Body ◽  
Land Use Changes ◽  
Industrial Area ◽  
Considerable Change ◽  
Key Drivers ◽  
Map Analysis ◽  
Use Category ◽  
Agricultural Settlement

A digital land use map of the study area Rajahar VDC at Nawalparasi district was prepared with the aid of RS/GIS for 1989 to 2013 followed by land use map analysis. The obtained image was classified as forest, agricultural, settlement, water body and religious areas for the study year 1989 to 1999 where industrial area was included as new land use category (0.07%) for 2013. The study showed that there was considerable change in forest area (-3.47%) and religious area (-0.01%). But agriculture land, settlement area and water body were increased by 2.02%, 3.66% and 1.28%, respectively. The land use change for 1989 to 2013 followed polynomial (R2: 0.6577) pattern. The identified land use change key drivers were dependent on past events and reactions of the respondents. ECOPRINT 21: 55-62, 2014   DOI: http://dx.doi.org/10.3126/eco.v21i0.11905

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

2021 ◽  
Vol 14 (2) ◽  
pp. 10-18
Author(s):  
Herry Andrisa ◽  
Hairul Basri ◽  
Muhammad Rusdi
Keyword(s):  
Land Use ◽  
Land Use Change ◽  
Satellite Imagery ◽  
Catchment Area ◽  
Secondary Forest ◽  
Flow Coefficient ◽  
Secondary Forests ◽  
Water Catchment Area ◽  
Water Catchment ◽  
Forest Rehabilitation

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.

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