CD Tesis

Analisis Dampak Penyekatan Kanal Terhadap Pembasahan Lahan Gambut (Studi Kasus : Ds. Sungai Tohor, Kabupaten Kepulauan Meranti)

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Peatland fires are a recurring phenomenon and become a biggest problem in Indonesia. This problem was triggered because of conversion of peat swamp forest into agriculture and plantations, accompanied with the construction of drainage canals. The land use change with canalization can affect the hydrological function of the peat ecosystem which causes over drain and drought. One of the efforts to rewet the peat and keep the ground water level high is by canal blocking. However, the extent to which canal blocking can keep peatlands wet is still questionable, so further research is needed.
This study aims to analyze the impact of canal blocking on rewetting peatlands in the perpendicular direction from the canal and to measure the soil hydraulic conductivity in correlation with the speed of drying and rewetting the peatlands. Analysis of the impact of rewetting peat to the land was carried out by monitoring the groundwater level fluctuation (GWL) due to canal blocking at a distance of 22 m, 74 m, 124, 172 m and 235 m from the canal. The impact of canal blocking on water level fluctuation at channel upstream was carried out by hydraulic modeling using HEC-RAS software. The data used for modeling are both data from measurements, such as discharge, channel geometry, and from institutional, namely rainfall and lidar topography.
The GWL monitoring results show that canal blocking can increase the GWL elevation in peatlands to a radius of 228 m from the canal. If the canal blocking target is to keep the GWL at least 0.4 m deep, the effect will be effective up to a radius of about 95 m. The radius may be smaller or larger, depending on hydro-topography conditions, peat property characteristics and land cover. The average speed of water penetration into the peatland due to canal blocking is about 0.28 m/minutes, and the average drain speed from the peatland without canal blocking is about 1.032 m/minutes. The calibration process on hydraulic modeling obtained roughness coefficient about 0.04 with the values of R = 0.998 and RMSE = 0.025, that means a very strong relationship. The hydraulic model can be used to evaluate several scenarios of water management during the dry and rainy season so that the GWL is less than 0.4 m. The increase of the average water level of the canal to the spillway during the dry season is 0.16 m, while in the rainy season it is 0.63 m.
Keywords: Peat rewetting, GWL fluctuation, Hydraulic conductivity and HEC-R

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Ketersediaan

Informasi Detail

Judul Seri

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No. Panggil

10 12. 220 (0039)

Penerbit

Pekanbaru : Universitas Riau – Pascasarjana – Tesis Teknik Sipil., 2020

Deskripsi Fisik

xxii, 203 hlm.: ill.: 29 cm

Bahasa

Indonesia

ISBN/ISSN

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Klasifikasi

10 12. 220 (0039)

Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

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Subjek

TEKNIK SIPIL

Info Detail Spesifik

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Pernyataan Tanggungjawab

FATAH

Versi lain/terkait

Lampiran Berkas

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