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TECHNICAL APPROACH OF EROSION AND SEDIMENTATION ON CANAL (CASE STUDY IN DELTA TELANG I, BANYUASIN, SOUTH SUMATRA PROVINCE)

TECHNICAL APPROACH OF EROSION AND SEDIMENTATION ON CANAL (CASE STUDY IN DELTA TELANG I, BANYUASIN, SOUTH SUMATRA PROVINCE)

1Achmad Syarifudin, 2Momon Sodik Imanudin, 3Arie S Moerwanto, 3Muhammad Yazid, and 3FX Suryadi

1Doctoral Student of Environmental Science, Sriwijaya University, Jl. Padang Selasa No 524. Palembang-South Sumatra

2Promoters

3Co-Promoters

Abstract. Dynamics of the water level in the swamp area in both tertiary and in the channels is strongly influenced by several  conditions, among others: the amount of rainfall, land hydrotopography, potential flood tide, the potential for drainage, water management network conditions, and operation of the waterworks building. Those components must be evaluated and analyzed to support the plant water needs. In the channel itself it is needed direct observations in the field in order to get accurate observational data. But this way takes time, effort, and considerable expense. Therefore the use of computer models to predict and evaluate the performance of the network is an appropriate solution. This study examined the existing condition and SDU SPD channels on the secondary block of P8-13S Telang I swamps by analyzing sediment cohesiveness in the channel, cross-sectional survey, and profile measurements of longitudinal channels as well as observations of water level in the channel for 2 times in 24 hours. The results showed that the erosion occurring on cross section roads of SPD P0 (at the beginning line) was 5,001.5 m3. On the P38 segment (middle line) and P&^ segment (end line), the erosions were 3,444) and 3228 m3 . cumulatively, the erosion on the channel SPD amounted to 126,713.5 m3. SDU channel sedimentation occurring at P0 segment (initial line) was 582.2 m3. On P36 segment (middle line) scale sedimentation was 915.5 m3 and on the segment P74 (end line), the sedimentation value was 1,088.5 m3. Cumulatively, the amount of sediment in the channel SDU P8-13S was 34,184.7 m3.

Keywords: Canal in wetlands, dynamics of water level, erosion, and sedimentation

INTRODUCTION

Tidal marsh areas are generally areas that have relatively flat topography, situated at the river mouth near the beach, and naturally formed and also influenced by tides on a periodic basis. Characteristic of the tidal marsh area is very unique when compared to the technical irrigation area because water supply availability of tidal marshes is always of high and low tides of the seawater. The land has unique properties that are acidic, pyrite and peat contents, and salt-water intrusion during dry season.

SAMPLE PREPARATION FOR PEAT MATERIAL ANALYSIS

SAMPLE PREPARATION FOR PEAT MATERIAL ANALYSIS

Masganti

 

Riau Assessment Institute for Agricultural Technology

Abstract. Sample preparation is an important step in analysis of chemical properties of peat material. Hydrophobicity is one important properties, because this trait can lead to reduce accuracy of the analysis. Water in peat material is casy to loss by heating. Long time drying or heating peat material during preparation can cause the peat material to be hydrophobic, therefore reactivity to water or extractant solution become low. That condition makes seriously problem in analyzing soil chemical properties, because less or no reaction between extractant solution and solid peat material produces inaccurate or less accurate analysis results. The purpose of this paper was to talk about duration of drying peat material become hydrophobic at: (a) drying under room temperature and (b) heating in the oven at 50oC. duration of peat material preparation by drying at room temperature was suggested than 36 hours long, while drying it using oven at 50oC should not longer than 5 hours.

INTRODUCTION

Soil analysis is impotant step in determining strategy of land development. In laboratorium, soil analysis starts from preparation of soil samples. Proper preparation of soil samples for chemical analysis was one important step to obtain actual quality  of the soil (Tan 1996). Method of soil sample preparation, which is inaccurate, causes deviation in the analysis values of soil chemical properties, thus causing error in determining  strategies of land management, particulary with regard to determination of type and amount of fertilizer needed. This situation leads to low efficiency and effectiveness of fertilization (Masganti 2003), so the maximum level of crop productivity was not achieved. Masganti et al. (2001) and Masganti (2005; 2006) reported that peat material analyzed under hydrophilic condition has chemical properties in contrast with peat material analyzed under hydrophobic condition.