scholarly journals PREDIKSI EROSI DAN SEDIMENTASI PADA BERBAGAI PENGGUNAAN LAHAN DI SUB DAS MASANG BAGIAN HULU DI KABUPATEN AGAM

Jurnal Solum ◽  
2011 ◽  
Vol 8 (1) ◽  
pp. 11
Author(s):  
Aprisal Aprisal
Keyword(s):  
Land Use ◽  
Plant Density ◽  
Secondary Data ◽  
Crop Coefficient ◽  
Soil Survey ◽  
Delivery Ratio ◽  
Sediment Delivery Ratio ◽  
Sediment Delivery ◽  
Data Analyses ◽  
Housing Area

Erosion and sedimentation prediction in sub-watershed Masang was conducted to predict amount of soil eroded and sedimented from several land use in the location, and to find out  alternative land use that can suppress erosion to be equal to or less than tolerated erosion as well.  Methods employed to do this research were 1) analysis of basic data (topography map, land use map, and secondary data such as rainfall data from the nearest meteorology station), 2) soil survey and identification to field, 3) soil analyses at laboratorium, and 4) data analyses using USLE erosion model and sediment delivery ratio (SDR).  The results showed that amount of soil eroded from all land use except from forest was higher than tolerated erosion.  Among the types of land use were mixed garden, housing, plantation, and bush.  Higher erosion than tolerated erosion was probably due to low plant density, big percentage of uncover land, therefore, raindrops became easier to hit soil and then disperse the aggregates.  As a consequence, erosion and sedimentation became bigger.  Soil eroded could be minimized into the same or less than tolerated erosion by implementing conservation agroecotechnology by reducing crop coefficient value (into 0.001) through increasing plant density and changing bush land into garden or plantation.  For housing area, the area should be planted by perennial crops, should be provided by terraces to ditches to pass runoff.  Soil sedimentl was calculated to be higher from garden and bush, but by implementing agroecotechnology conservation sediment can be controlled.Keywords: erosion, sedimentation, watershed

scholarly journals PREDIKSI EROSI DAN SEDIMENTASI PADA BERBAGAI PENGGUNAAN LAHAN DI SUB DAS DANAU LIMAU MANIS PADA DAS KURANJI KOTA PADANG

Jurnal Solum ◽  
2010 ◽  
Vol 7 (1) ◽  
pp. 61
Author(s):  
Aprisal Aprisal ◽  
Junaidi Junaidi
Keyword(s):  
Land Use ◽  
Plant Density ◽  
Soil Aggregates ◽  
Crop Coefficient ◽  
Delivery Ratio ◽  
Land Uses ◽  
Sediment Delivery Ratio ◽  
Sediment Delivery ◽  
Erosion Prediction ◽  
Conservation Method

Erosion prediction and sedimentation measurement in sub-watershed Danau Limau Manis was conducted to predict erosion and sedimentation from several land uses there, as well as to find out other types of land use being able to reduce erosion as tolerated one.   Methods used for this research was divided into {1) soil map analyses(topography and land use), rainfall data, (2) survey and soil sampling in the field, (3) soil analyses in laboratory, and (4) data analyses using erosion model “USLE” and “Sediment Delivery Ratio”.  The results showed that there 4 types of land use (mixed garden, settlement, farming, and bush) having erosion higher than tolerated erosion(etol).  This was due to low plant density and many areas open, therefore, rainfall will directly struck soil aggregates causing dispersion. To eliminate or reduce the erosion rate into etol could be done by “agroecotechnology conservation”method.  That is by increasing plant density,  changing bush land into garden so that the crop coefficient will became 0.001.  While at settlement area, it should be planted by perennial trees, built terrace and water ditch.  Garden and bush land contributed highest amount of sediment, however it can be reduced if agroecotechnology conservation method is applied.Key word: watershed, erosion, sedimentation

scholarly journals ESTIMASI EROSI DAN POTENSI SEDIMEN DAM BATUTEGI DI DAS SEKAMPUNG HULU DENGAN METODE SDR (SEDIMENT DELIVERY RATIO)

2018 ◽  
Vol 6 (2) ◽  
pp. 161
Author(s):  
Beny Tribiyono ◽  
S. B. Yuwono ◽  
I. S. Banuwa
Keyword(s):  
Land Use ◽  
River Flow ◽  
Delivery Ratio ◽  
Sediment Delivery Ratio ◽  
Sediment Thickness ◽  
Sediment Delivery ◽  
Average Value

Watershed The process of River Flow (DAS) conducted by humans is incorrect, causing damage and bad conditions to the environment on the downstream. Unregulated land use with land and air formulations in the Upper DAS section contains the amount of erosion. One of the main problems occurring in the Sekampung Hulu Basin is the magnitude of erosion. The erosion will increase the rate of erosion and the amount of sediment entering the river. The study aims to (1) estimate sediment potential in DAM Batutegi and (2) estimate erosion in Sekampung Hulu Basin with SDR method (Sediment Delivery Ratio). Based on the analysis result, the total value of sediment potential in DAM Batutegi is 83.478,74 ton/year or equivalent with sediment thickness of 5.04 mm/year and the average value obtained by SDR method in Sekampung Hulu Basin is on average 140,31 ton/ha/year.Proses perlakuan pemanfaatanDaerah Aliran Sungai (DAS) yang dilakukan oleh manusia secara tidak benar, menimbulkan kerusakan dan kondisiyang buruk terhadap lingkungan pada bagian hilir. Pemakaian pada lahan yang tidak setaraf dengan rumusan-rumusan konservasi tanah dan air di bagian hulu DAS menimbulkanbesarnya erosi. Salah satu permasalahan utama yang sering terjadi di DAS Sekampung Hulu adalah besarnya erosi. Erosi yang terjadi akan meningkatkan laju erosi dan jumlah sedimen yang masuk ke sungai. Penelitian bertujuan (1) memperkirakan besarnya potensi sedimen di DAM Batutegi dan (2) memperkirakan erosi di DAS Sekampung Hulu dengan metode SDR (Sediment Delivery Ratio). Diketahui berdasarkan hasil analisis, nilai total potensisedimen di DAM Batutegi sebesar 83.478,74 ton/tahun atau sepadan dengan ketebalan sedimen sebesar 5,04 mm/tahun dan nilai estimasierosi yang didapatkan dengan metode SDR di DAS Sekampung Hulu rata-rata sebesar 140,31 ton/ha/tahun.

KAJIAN EROSI LAHAN DI KAWASAN AIR STRIP RUNWAY 2600 BANDARA DEPATI AMIR (PGK) BERDASARKAN TATA GUNA LAHAN MASTERPLAN ULTIMATE

2019 ◽  
Vol 7 (2) ◽  
pp. 100-111
Author(s):  
Miskar Maini ◽  
Junita Eka Susanti
Keyword(s):  
Sediment Yield ◽  
Soil Loss ◽  
Universal Soil Loss Equation ◽  
Delivery Ratio ◽  
Sediment Delivery Ratio ◽  
Sediment Delivery ◽  
Soil Loss Equation

Standar permintaan engineering pesawat agar desain bangunan infrastruktur di area Air Strip Runway 2600 yang ada dapat mempunyai fungsi lain. Sedangkan kondisi lain sangat menentukan keselamatan karena lahan di sekitar Air Strip Runway 2600 Bandara Depati Amir (PGK) jika tidak ditutupi vegetasi seperti rumput, kondisi lain lahan yang belum ditutupi vegetasi di sekitar Air Strip Runway 2600 berpotensi akan mengalami erosi lahan, kemudian hasil erosi lahan ini akan terbawa oleh aliran air sehingga akan masuk ke saluran drainase yang akan menyebabkan sedimentasi pada saluran drainase tersebut, akhirnya akan berkurang efektifitas kinerja saluran drainase tersebut. Metode yang digunakan untuk memprediksi laju rata-rata erosi di area Air Strip Runway 2600 dengan memperhitungkan faktor erosivitas hujan, erodibilitas tanah, kemiringan lereng atau panjang lereng, pengelolaan tanaman dan konservasi tanah, yang masing masing tata guna lahan tersebut mengacu pada Masterplan Ultimate Bandara Depati Amir (PGK). Perhitungan dilakukan menggunakan persamaan USLE (Universal Soil Loss Equation) yang dikembangkan oleh Wischmeier dan Smith (1965, 1978), kemudian Sediment Delivery Ratio (SDR) dan Sediment Yield.Hasil penelitian ini, prediksi laju erosi permukaan pada area Air Strip Runway 2600 Bandara Depati Amir (PGK) tahun pertama yang mencapai 5,60 mm/tahun atau 100,76 Ton/Ha/tahun, laju erosi tahun kedua mencapai 3,38 mm/tahun atau 60,84 Ton/Ha/tahun dapat diklasifikasikan ke dalam kelas bahaya erosi sedang (kelas III) dan nilai SDR adalah sebesar 56,3%, nilai sediment yield (SR) pada tahun pertama sebesar 5.887,59 Ton/Tahun, pada tahun kedua ketika rumput pada area Air Strip telah tumbuh dengan sempurna terjadi penurunan hasil sediment yield yaitu nilai SR sebesar 3.554,85 Ton/Tahun.

scholarly journals Factors influencing the sediment delivery ratio of the Three Gorges Reservoir

2018 ◽  
Vol 40 ◽  
pp. 03019
Author(s):  
Dayu Wang ◽  
Chunhong Hu ◽  
Chunming Fang ◽  
Jianzhao Guan ◽  
Lei Zhang
Keyword(s):  
Sensitivity Analysis ◽  
Three Gorges Reservoir ◽  
Delivery Ratio ◽  
Three Gorges ◽  
Sediment Delivery Ratio ◽  
Sediment Delivery ◽  
Shape Coefficient ◽  
The Three Gorges Reservoir ◽  
The Three Gorges ◽  
Dam Site

In recent years, the sediment delivery ratio (SDR) of the Three Gorges reservoir (TGR) has noticeably decreased as a result of the increase in water levels at the dam site and the decrease in inflow of fine particles, thereby resulting in increased reservoir siltation. Therefore, it is vital to research the factors that influence the SDR of the TGR. Factors that could have impact on the SDR were studied using TGR monitoring data. The study indicated that the water level at the dam site and inflow and outflow rates could have contributed to the change in the SDR. A sensitivity analysis of the influencing factors was then carried out using a mathematical model to simulate numerous sediment movement scenarios in the TGR. By changing the input conditions of the model, sufficient results were obtained to enable a sensitivity analysis of each factor. The results showed the flood retention time (FRT)—the ratio of reservoir capacity to average outflow discharge—was the principal factor influencing the SDR. The other factors (inflow sediment concentration, inflow sediment coefficient, inflow sediment gradations, and the shape coefficient of the inflow flood shape coefficient), also had an influence on the SDR. However, under different levels of FRT, their degrees of influence on the SDR were not the same..

scholarly journals Estimation of sediment amount from ungauged area and analysis of sediment delivery ratio of Three Gorges Reservoir

2019 ◽  
Vol 31 (1) ◽  
pp. 28-38
Author(s):  
LIU Shangwu ◽  
◽  
ZHANG Xiaofeng ◽  
XU Quanxi ◽  
ZHANG Ouyang ◽  
...  
Keyword(s):  
Three Gorges Reservoir ◽  
Delivery Ratio ◽  
Three Gorges ◽  
Sediment Delivery Ratio ◽  
Sediment Delivery
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