scholarly journals ANALISIS RESPON HIDROLOGI DAN SIMULASI TEKNIK KONSERVASI TANAH DAN AIR SUB DAS CIMANUK HULU

2019 ◽  
Vol 19 (1) ◽  
pp. 26-32
Author(s):  
Gilang Munggaran ◽  
Yayat Hidayat ◽  
Surya Darma Tarigan ◽  
Dwi Putro Tejo Baskoro

Cimanuk Watershed is a priority catchment in West Java Province. The objective of study is to analyze various land use scenarios to improve base flow and lateral flow. The analysis use SWAT Hydrology model. The study showed that model has a good performance in predicting flow discharge produced NSE 0.56 (satisfactorily) and R2 0.70. There are four scenarios to be analyzed. The best base flow and lateral flow analyses is from the first scenario with soil and water conservation techniques. The scenario resulted the river regime coefficient by 78 (moderat), reduce direct runoff by 40.76% and increase lateral by 536.95 mm. Keywords: Base flow, landuse, lateral flow, soil and water conservation techniques, SWAT model 

2020 ◽  
Vol 25 (4) ◽  
pp. 503-514
Author(s):  
Nicko Widiatmoko ◽  
Suria Darma Tarigan ◽  
Enni Dwi Wahjunie

Land use change is one of the causes of the decreasing of hydrological function that affects the hydrological response of a watershed. Planning of watershed management needs to be conducted to improve the hydrological function of the watershed. This study aims to determine the hydrological response in supporting watershed management planning in Opak Hulu Watershed. This research was conducted using the Soil and Water Assessment Tool (SWAT) hydrological modeling. The method used included data collection, processing of input data, running of SWAT model, calibration, validation, and the decision of the best watershed management scenarios. The results of the analysis of land use changes in the Opak Hulu Watershed in 2012–2017 had a significant increase in mixed upland agriculture (3.21%) and shrubs (1.43%). Meanwhile, open field (2,31%) and dry land agriculture (1.71%) decreased significantly. Based on the analyzed hydrological scenario, Soil and Water Conservation techniques can decrease the surface runoff and increase the lateral flow and base flow. The scenario is able to decrease the surface runoff by 542.22 mm (27.09%). It increases lateral flow and base flow by 321.82 mm (13.15%) and 797.28 mm (18.32%), respectively. The best watershed management planning with Soil and Water Conservation technique is able to reach Annual Flow Coefficient value to 0,33 (moderate) and 69,85 (moderate) for Flow Regime Coefficient. Keywords: land use, soil and water conservation techniques, SWAT model, watershed


2020 ◽  
Vol 21 (2) ◽  
pp. 66-71
Author(s):  
Leonard Kristofery ◽  
Kukuh Murtilaksono ◽  
Dwi Putro Tejo Baskoro

The Ciliman Watershed is one of the watersheds in Kabupeten Lebak and Kabupaten Pandeglang with a total area ± 500 km2. According to report of Badan Nasional Penanggulangan Bencana (BNPB) Serang City, flooding often occurs in the Ciliman watershed because of the overflow of the Ciliman tributaries, this occurs because of the conversion of land use in the upstream area of Ciliman watershed so that during the rainy season, rainwater does not seep into the ground but directly into runoff. The aims of the research is to simulate several soil and water conservation as an effort to better manage the Ciliman watershed and determine the best land use scenario in accordance with the biophysical Ciliman watershed. This study applied SWAT model as a tool to simulate several soil and water conservation technical at Ciliman watershed. The scenarios simulated were: 0) existing condition, 1) application of forest area functions, 2) application of soil and water conservation techniques using RTK RHL, 3) application of regional spatial planning (RTRW). The results showed that scenario 2 (RTK RHL) was the best scenario by overall. Scenario 2 can reduce the Qmax/Q min ratio by 31.63% compared to other scenarios. And also can reduce coefficient of runoff by 24% and direct runoff by 23.55% and increase baseflow by 16.20% and water yield by 1.77%.


2020 ◽  
Vol 25 (1) ◽  
pp. 7
Author(s):  
Margareta Edo Dhoke ◽  
Ambar Kusumandari ◽  
Senawi Senawi

AbstrakKajian tingkat erosi dan rancangan Konservasi Tanah-Air (KTA) telah dilakukan di Sub DAS Waewoki DAS Aesesa Kabupaten Ngada Provinsi Nusa Tenggara Timur. Penelitian ini bertujuan untuk memprediksi tingkat erosi di Sub DAS Waewoki dan menentukan teknik KTA di Sub DAS Waewoki. Untuk memprediksi erosi, diterapkan model SWAT, dengan tahapan deliniasi DAS, pembentukan peta unit lahan, input data iklim serta data pendukung yang dibutuhkan, dan running SWAT. Dari 51 unit lahan di wilayah kajian diambil sampel tanah pada 13 titik lokasi berdasarkan GPS. Untuk merancang teknik KTA digunakan analisis klaster. Hasil penelitian menunjukkan bahwa tingkat erosi yang terjadi pada enam tahun terakhir sangat bervariasi, dari tingkat erosi sangat ringan sebesar 0,11 %, kelas ringan sebesar 1,38 % dan kelas sedang sebesar 1 %. Berdasarkan model regresi ditunjukkan bahwa faktor erosi yang paling berpengaruh di lokasi penelitian adalah kelerengan, yang signifikan terhadap kriteria probabilitas yaitu 0.05. Rancangan teknik KTA dirancang pada jarak tandan terkecil dengan jumlah kelompok klaster sebayak 5 yang memiliki klasifikasi unit lahan yang berbeda-beda. Pengklasteran unit lahan menunjukkan bahwa faktor kelerengan, penggunaan lahan dan jenis tanah merupakan faktor yang paling dominan untuk terbentuknya kelompok klaster I dan V, sedangkan untuk kelompok klaster II, III, dan IV faktor yang paling dominan adalah penggunaan lahan dan jenis tanah. Model KTA yang diterapkan pada setiap kelompok klaster adalah model vegetatif dan mekanik sesuai dengan klasifikasi yang terbentuk.AbstractThe study erosion level and Soil-Water Conservation (SWC) engineering plan was conducted in Waewoki Sub watershed, Aesesa Watershed, Ngada Regency, East Nusa Tenggara Province. This study was aimed at predicting the erosion level in Waewoki Sub watershed and determining Soil and Water Conservation engineering in Waewoki Sub watershed. To predict erosion, SWAT model was applied, with model analysis phases including watershed delineation, land unit map creation, climate data input and supporting data needed, and running SWAT. From the 51 units of land in the study area, the soil samples were collected at 13 locations using GPS. Cluster analysis was used to plan SWC engineering. The results showed that the erosion level occurred in the last six years varied widely, ranging from very mild erosion level of 0.11%, mild level of 1.38%, and medium level of 1%. The statistical test with regression model approach showed that the most influential factor of erosion in the study site was slope, which was significant to the probability criterion, i.e. 0.05. SWC engineering plan was planned in the smallest cluster distance by 5 cluster groups with different land unit classification. Land unit clustering showed that the factors of slope, land use and soil type were the most dominant factors for the formation of the cluster groups I and V, while the most dominant factors for cluster groups II, III, and IV were land use and soil type. The SWC models applied to each cluster group were vegetative and mechanical models, in accordance with the classification formed.


2015 ◽  
Vol 737 ◽  
pp. 728-731 ◽  
Author(s):  
Yuan Yuan Han ◽  
Tao Cai

In this study, Soil and Water Assessment Tool (SWAT) model was used to simulate land-use change effects on water quantity in the upper Huaihe river basin above the Xixian hydrological controlling station with a catchment area of 10,190 km2 by the use of three-phase (1980s、1990s、2000s) land-use maps, soil type map (1:200000), 1980 to 2008 daily time series of rainfall from the upper Huaihe river basin. On the basis of the simulated time series of daily runoff, land-use change effects on spatio-temporal change patterns of runoff coefficients and runoff modules were investigated. The results revealed that under the same condition of soil texture and terrain slope the advantage for runoff generation and the sensitivity of rainfall-runoff relationship to rainfall descended by farmland, paddy field, woodland.The outputs could provide important references for soil and water conservation and river health protection in the upper stream of Huaihe river.


2013 ◽  
Vol 34 (3) ◽  
pp. 236-259 ◽  
Author(s):  
Gebeyehu Taye ◽  
Jean Poesen ◽  
Bas Van Wesemael ◽  
Matthias Vanmaercke ◽  
Daniel Teka ◽  
...  

2019 ◽  
Vol 87 ◽  
pp. 104051 ◽  
Author(s):  
Nathan S. Chesterman ◽  
Julia Entwistle ◽  
Matthew C. Chambers ◽  
Hsiao-Chin Liu ◽  
Arun Agrawal ◽  
...  

2007 ◽  
Vol 31 (4) ◽  
pp. 389-403 ◽  
Author(s):  
Liding Chen ◽  
Wei Wei ◽  
Bojie Fu ◽  
Yihe Lü

The Loess Plateau, China, has long been suffering from serious soil erosion. About 2000 years ago, larger areas were used for grain production and soil erosion was thus becoming severe with increase in human activity. Severe soil and water loss led to widespread land degradation. During the past decades, great efforts were made in vegetation restoration to reduce soil erosion. However, the efficiency of vegetation restoration was not as satisfactory as expected due to water shortage. China initiated another state-funded scheme, the `Grain-for-Green' project in 1999, on the Loess Plateau to reduce soil erosion and improve land quality. However, the control of soil erosion effectively by land-use modification raised problems. In this paper, the lessons and experiences regarding soil and water conservation in the Loess Plateau in the past decades are analysed first. Urgent problems are then elaborated, such as the contradiction between land resource and human population, shortage of water both in amount and tempospatial distribution for vegetation growth, weak awareness of the problems of soil conservation by local officials, and poor public participation in soil and water conservation. Finally, suggestions regarding soil and water conservation in the Loess Plateau are given. In order to control soil erosion and improve vegetation, a scientific and detailed land-use plan for the Loess Plateau has to be made, in the first instance, and then planning for wise use of water resources should be undertaken to control mass movement effectively and to improve land productivity. Methods of improving public awareness of environmental conservation and public involvement in vegetation rehabilitation are also important.


2017 ◽  
Vol 18 (4) ◽  
pp. 1743-1755 ◽  
Author(s):  
Nigus Demelash Melaku ◽  
Chris S. Renschler ◽  
Hubert Holzmann ◽  
Stefan Strohmeier ◽  
Wondimu Bayu ◽  
...  

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